Answer:
2.43 s
Explanation:
Using newton's equation of motion.
T = (v-u)/g
Where T = time taken for the object to return to the point of projection , u = initial velocity, v = final velocity, g = acceleration due to gravity.
Given: v =-14 m/s, u = 14 m/s, g = -9.8 m/s²
T = (-14-14)/-9.81
T = 2.85 s
Note: We look for the object's speed at 5.0 m.
using
v² = u²+2gs.................................... Equation 1
Where v = final velocity, u = initial velocity, g = acceleration due to gravity, s = distance.
Given: u = 14 m/s, g = -9.81 m/s², s = 5.0 m
Substitute into equation 1
v² = 14²+(-9.81×5×2)
v² = 196-98.1
v = √97.9
v = 9.89
We look for the time taken for the velocity to decrease from 14 m/s to 9.89 m/s.
using
v = u+gt
t =(v-u)/g........................... Equation 2
Where t = time taken for the object to decrease it velocity from 14 m/s to 9.89 m/s
Given: v = 9.89 m/s, u =14 m/s g = -9.81 m/s²
t = (14-9.89)/-9.81
t = -4.11/-9.81
t = 0.42 s
Thus,
Time taken to reach 5.0 m above projection point = T-t
=2.85-0.42
2.43 s
It takes approximately 1.03 seconds for the object to reach a height of 5.0 m above the projection point while descending.
The time it takes for an object to reach a certain height when thrown upwards can be determined using equations of projectile motion.
In this case, with an initial speed of 14 m/s and a height of 5.0 m, we can use the equation :
[tex]$$y = y_0 + v_{oy}t - \frac{1}{2}gt^2$$[/tex]
Substituting the known values, we get:
[tex]$$5.0 = 0 + 14t - \frac{1}{2}(9.8)t^2$$[/tex]
By rearranging the equation and solving it,
we find that it takes approximately 1.03 seconds for the object to reach a height of 5.0 m above the projection point while descending.
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An object's velocity in m/s is given by the equation vx(t) = 10t-2. If it starts at x=0 at t=0, what is its position after 5 seconds?
Answer: d(5) = 115m
Position after 5 seconds is 115m
Explanation:
Given;
Initial position d(0) = 0
Time = 5 sec
Velocity function vx(t) = 10t - 2
To determine its position after 5 sec we need to calculate the position function.
d(t) = integral of vx(t)
d(t) = ∫10t - 2
d(t) = (10/2)t^2 - 2t + c
d(t) = 5t^2 - 2t + d(0)
c = d(0) = 0
d(t) = 5t^2 - 2t
So, at time t = 5
d(5) = 5(5^2) -2(5) = 125 - 10
d(5) = 115m
Two parallel plates have equal but opposite charges on their surface. The plates are separated by a finite distance.
A fast moving proton enters the space between the two plates through a tiny hole in the left plate A. The electric potential energy of the proton increases as it moves toward plate B.
(a) How is the speed of the proton affected as it moves from plate A to plate B?
increases
decreases
stays the same
(b) Which plate is at a higher potential?
plate A
plate B
(c) What can you conclude about the charges on the two plates?
Plate A is positive and plate B is negative.
Plate A is negative and plate B is positive.
(d) What will be the pattern of the equipotential lines in the space between the two plates? (Select all that apply.)
Parallel lines more closely packed near plate B.
Parallel lines perpendicular to the two plates.
Parallel lines parallel to the two plates.
Parallel lines more closely packed near plate A.
Parallel lines equally spaced.
Answer:
(a) The speed of proton decreases as it moves from A to B.
(b) Plate B is at a higher potential.
(c) Plate B is positive, plate A is negative.
(d) Parallel lines parallel to the two plates.
Parallel lines equally spaced.
Explanation:
The electric potential energy is given by the following formula:
[tex]U = \frac{1}{4\pi \epsilon_0}\frac{qq_0}{r}[/tex]
Alternatively, potential energy in a uniform electric field is
[tex]U = qEr[/tex]
where 'r' is the distance from negative to positive plates. This definition is analogues to that of gravitational potential energy, U = mgh.
If the positively charged proton is gaining potential energy as it gets closer to plate B, then plate B is charged positively.
(a) According to this information, the speed of proton decreases as it moves from A to B. This is similar to the speed of an object which is gaining potential energy by moving higher.
(b) By the same gravitational analogy, plate B is at a higher potential.
(c) As explained before, Plate A is negative and Plate B is positive.
(d) The equipotential lines are parallel to electric field lines which are perpendicular to the plates. So, the equipotential lines are parallel to the plates. Since the electric field between the plates is uniform, then the equipotential lines are equally seperated.
A cylindrical shell of length 220 m and radius 4 cm carries a uniform surface charge density of σ = 14 nC/m^2.
1. What is the total charge on the shell?
Answer:
Explanation:
Given
Length of shell [tex]L=220\ m[/tex]
radius of cylindrical shell [tex]r=4\ cm[/tex]
surface charge density [tex]\sigma =14\ nC/m^2[/tex]
Total charge on the shell [tex]Q=surface\ area\times surface\ charge\ density[/tex]
surface area [tex]A=2\pi r\cdot L=2\pi \cdot 0.04\cdot 220=55.299\ m^2[/tex]
[tex]Q=\sigma \cdor A[/tex]
[tex]Q=14\times 10^{-9}\times 55.299[/tex]
[tex]Q=7.741\times 10^{-7}\ C[/tex]
A particle starts from the origin at t = 0 with a velocity of and moves in the xy plane with a constant acceleration of . At the instant the particle's x coordinate is 29 m, what are (a) its y coordinate and (b) its speed?
Answer:
a) When the x-component of the position of the particle is 29 m, the y-component is 45 m.
b)When the x-component of the position of the particle is 29 m, its speed is 21.8 m/s.
Explanation:
I´ve found the complete question on the web:
A particle starts from the origin at t=0 with a velocity of 8.0 j m/s and moves in the x-y plane with a constant acceleration of (4i + 2j) m/s^2. At the instant the particle's x-coordinate is 29m. What are its y-coordinate and speed?
a) First, let´s find at which time the particle is located at 29 m along the x-axis. For that let´s use the equation of position of an object moving in a straight line at constant acceleration:
x = x0 + v0x · t + 1/2 · ax · t²
Where:
x = x-component of the position of the particle at time t
x0 = initial x-position.
v0x = initial x-component of the velocity.
t = time
ax = x-component of the acceleration.
We have the following data:
x = 29 m
x0 = 0 (because the particle starts from the origin, x = 0 and y = 0).
v0x = 0 (the initial velocity only has an y-component).
ax = 4 m/s²
Then, the equation of position gets reduced to this:
x = 1/2 · a · t²
29 m = 1/2 · 4 m/s² · t²
29 m/ 2 m/s² = t²
t = 3.8 s
Now, we can find the y-component of the position of the particle at that time:
y = y0 + v0y · t + 1/2 · ay · t²
Where:
y = y-component of the position of the particle at time t.
y0 = initial y-component of the position.
v0y = initial y-component of the velocity.
ay = y-component of the acceleration
t = time.
We have the following data:
y0 = 0
v0y = 8.0 m/s
ay = 2 m/s²
t = 3.8 s (calculated above)
Then, we can calculate "y" at t = 3.8 s
y = 0 + 8.0 m/s · 3.8 s + 1/2 · 2 m/s² · (3.8 s)²
y = 45 m
When the x-component of the position of the particle is 29 m, the y-component is 45 m.
b) To find the speed of the particle, let´s use the equation of velocity.
For the x-component of the velocity (vx):
vx = v0x + ax · t (v0x = 0)
vx = 4 m/s² · 3.8 s
vx = 15.2 m/s
The y-component of the velocity will be:
vy = v0y + ay · t
vy = 8.0 m/s + 2 m/s² · 3.8 s
vy = 15.6 m/s
Then, the vector velocity will be:
v = (15.2, 15.6) m/s
To calculate the speed, we have to find the magnitude of the velocity vector:
[tex]|v| = \sqrt{(15.2 m/s)^{2}+(15.6 m/s)^{2}} = 21.8 m/s[/tex]
When the x-component of the position of the particle is 29 m, its speed is 21.8 m/s.
How much time elapses from when the first bit starts to be created until the conversion back to analog begins
The question is not complete. Kindly find the complete question below:
Host A converts analog to digital at a = 58 Kbps Link transmission rate R = 1.9 Mbps Host A groups data into packets of length L = 112 bytes Distance to travel d = 931.9 km Propagation speed s = 2.5 x 108 m/s Host A sends each packet to Host B as soon as it gathers a whole packet. Host B converts back from digital to analog as soon as it receives a whole packet. How much time elapses from when the first bit starts to be created until the conversion back to analog begins? Give answer in milliseconds (ms) to two decimal places, normal rounding, without units (e.g. 1.5623 ms would be entered as "1.56" without the quotes)
Answer / Explanation
The answer is 19.65
Discuss what in particular makes the light bulb a non-ohmic resistor. Specifically, how does temperature affect resistance? Can thermal expansion explain the non-ohmic behavior? If not, describe what happens at the atomic level that accounts for the non-ohmic property
A light bulb acts as a non-ohmic resistor due to its changing resistance with temperature changes, primarily caused by increased atomic vibrations impeding electron flow. This contrasts with Ohm's Law's assumption of constant resistance, illustrating the complex atomic level interactions that govern a light bulb's resistance and thereby its non-ohmic behavior.
Explanation:The reason a light bulb is considered a non-ohmic resistor primarily lies in its changing resistance with variations in temperature, a characteristic that defies the principle of Ohm's Law which presumes constant resistance. In a light bulb, particularly an incandescent one, the filament's resistance increases significantly as it heats up from room temperature to its operating temperature. This increase in temperature, and consequently resistance, is not simply due to thermal expansion but is rooted in atomic level interactions.
At the atomic level, as the filament's temperature rises, the atoms inside the metal filament vibrate more vigorously. This enhanced vibration creates more impediments for the free flow of electrons, which is the principal cause of electrical current. Hence, with more obstacles in their path, electrons face increased resistance. This change in resistance with temperature illustrates the non-ohmic behavior as it shows that the resistance isn't constant but varies with temperature. It's clear that thermal expansion plays a role in this scenario, but the key factor is the increased atomic vibrations that hinder electron flow.
The power dissipation in resistors, and by extension in light bulbs, can be described by the equations P = V^2/R and P = I^2R. These seemingly contradictory formulae actually complement each other in explaining how power dissipation can either increase or decrease with rising resistance, depending on whether the scenario is considered from the perspective of voltage or current, further illustrating the complex relationship between these variables in a non-ohmic conductor like a light bulb.
A student measures the diameter of a small cylindrical object and gets the following readings: 4.32, 4.35, 4.31, 4.36, 4.37, 4.34 cm (a) What is the average diameter from these readings? (b) What is the standard deviation of these measurements? The student also measured the length of the object to be (0.126 ± 0.005) m and the mass to be object to be (1.66 ± 0.05) kg. Using the method from this week's lab, determine (c) the density and (d) the proportion of error in the density calculation.
Answer:
a. [tex]\bar{d}=4.34 cm[/tex]
b. [tex]\sigma=0.023 cm[/tex]
c. [tex]\rho=(0.0089\pm 0.00058) kg/cm^{3}[/tex]
Explanation:
a) The average of this values is the sum each number divided by the total number of values.
[tex]\bar{d}=\frac{\Sigma_{i=1}^(N)x_{i}}{N}[/tex]
[tex]x_{i}[/tex] is values of each diameterN is the total number of values. N=6[tex]\bar{d}=\frac{4.32+4.35+4.31+4.36+4.37+4.34}{6}[/tex]
[tex]\bar{d}=4.34 cm[/tex]
b) The standard deviation equations is:
[tex]\sigma=\sqrt{\frac{1}{N}\Sigma^{N}_{i=1}(x_{i}-\bar{d})^{2}}[/tex]
If we put all this values in that equation we will get:
[tex]\sigma=0.023 cm[/tex]
Then the mean diameter will be:
[tex]\bar{d}=(4.34\pm 0.023)cm[/tex]
c) We know that the density is the mass divided by the volume (ρ = m/V)
and we know that the volume of a cylinder is: [tex]V=\pi R^{2}h[/tex]
Then:
[tex]\rho=\frac{m}{\pi R^{2}h}[/tex]
Using the values that we have, we can calculate the value of density:
[tex]\rho=\frac{1.66}{3.14*(4.34/2)^{2}*12.6}=0.0089 kg/cm^{3}[/tex]
We need to use propagation of error to find the error of the density.
[tex]\delta\rho=\sqrt{\left(\frac{\partial\rho}{\partial m}\right)^{2}\delta m^{2}+\left(\frac{\partial\rho}{\partial d}\right)^{2}\delta d^{2}+\left(\frac{\partial\rho}{\partial h}\right)^{2}\delta h^{2}}[/tex]
δm is the error of the mass value.δd is the error of the diameter value.δh is the error of the length value.Let's find each partial derivative:
1. [tex]\frac{\partial\rho}{\partial m}=\frac{4m}{\pi d^{2}h}=\frac{4*1.66}{\pi 4.34^{2}*12.6}=0.0089[/tex]
2. [tex]\frac{\partial\rho}{\partial d}=-\frac{8m}{\pi d^{3}h}=-\frac{8*1.66}{\pi 4.34^{3}*12.6}=-0.004[/tex]
3. [tex]\frac{\partial\rho}{\partial h}=-\frac{4m}{\pi d^{2}h^{2}}=-\frac{4*1.66}{\pi 4.34^{2}*12.6^{2}}=-0.00071[/tex]
Therefore:
[tex]\delta\rho=\sqrt{\left(0.0089)^{2}*0.05^{2}+\left(-0.004)^{2}*0.023^{2}+\left(-0.00071)^{2}*0.5^{2}}[/tex]
[tex]\delta\rho=0.00058[/tex]
So the density is:
[tex]\rho=(0.0089\pm 0.00058) kg/cm^{3}[/tex]
I hope it helps you!
a. A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 26.7° and the angle of refraction is 18.3°, Find the critical angle for the liquid when surrounded by air?b. A light ray, traveling in air, strikes the surface of abeaker of mineral oil at an angle of 37.5° with thenormal to the surface. The speed of light in mineral oil is 2.17 x10^8 m/s.. Calculate the angle of refraction.
Answer:
(a). The critical angle for the liquid when surrounded by air is 44.37°
(b). The angle of refraction is 26.17°.
Explanation:
Given that,
Incidence angle = 26.7°
Refraction angle = 18.3°
(a). We need to calculate the refraction of liquid
Using Snell's law
[tex]n=\dfrac{\sin i}{\sin r}[/tex]
Put the value into the formula
[tex]n=\dfrac{\sin 26.7}{\sin 18.3}[/tex]
[tex]n=1.43[/tex]
We need to critical angle for the liquid when surrounded by air
Using formula of critical angle
[tex]C=\sin^{-1}(\dfrac{1}{n})[/tex]
Put the value into the formula
[tex]C=\sin^{-1}(\dfrac{1}{1.43})[/tex]
[tex]C=44.37^{\circ}[/tex]
(b). Given that,
Incidence angle = 37.5°
Speed of light in mineral [tex]v=2.17\times10^{8}\ m/s[/tex]
We need to calculate the index of refraction
Using formula of index of refraction
[tex]n=\dfrac{c}{v}[/tex]
Put the value into the formula
[tex]n=\dfrac{3\times10^{8}}{2.17\times10^{8}}[/tex]
[tex]n=1.38[/tex]
We need to calculate the angle of refraction
Using Snell's law
[tex]n=\dfrac{\sin i}{\sin r}[/tex]
[tex]\sin r=\dfrac{\sin i}{n}[/tex]
Put the value into the formula
[tex]\sin r=\dfrac{\sin 37.5}{1.38}[/tex]
[tex]r=\sin^{-1}(\dfrac{\sin 37.5}{1.38})[/tex]
[tex]r=26.17^{\circ}[/tex]
Hence, (a). The critical angle for the liquid when surrounded by air is 44.37°
(b). The angle of refraction is 26.17°.
Answer
a) Angle of incidence i = 26.7°
Angle of refraction r = 18.3°
From Snell’s law index of refraction of the liquid
[tex]n = \dfrac{sin\ i}{sin\ r}[/tex]
[tex]n = \dfrac{sin\ 26.7^0}{sin\ 18.3^0}[/tex]
n = 1.43
So, critical angle
[tex]C= sin^{-1}(\dfrac{1}{n})[/tex]
[tex]C= sin^{-1}(\dfrac{1}{1.43})[/tex]
C = 44.33°
b) Angle of incidence, i = 37.5°
speed of light in mineral oil , v = 2.17 x 10⁸ m/s
speed of light in air, c = 3 x 10⁸ m/s
refractive index of the oil
[tex]n = \dfrac{c}{v}[/tex]
[tex]n = \dfrac{3\times 10^8}{2.17\times 10^8}[/tex]
n = 1.38
again using Snell's law
[tex]n = \dfrac{sin\ i}{sin\ r}[/tex]
[tex]sin\ r = \dfrac{sin\ i}{n}[/tex]
[tex]sin\ r = \dfrac{sin\ 37.5^0}{1.38}[/tex]
[tex] r = sin^{-1}(0.441)[/tex]
r = 26.18°
hence, the angle of refraction is equal to r = 26.18°
A scooter has wheels with a diameter of 120 mm. What is the angular speed of the wheels when the scooter is moving forward at 6.00 m/s?
To develop this problem we will apply the concepts related to angular kinematic movement, related to linear kinematic movement. Linear velocity can be described in terms of angular velocity as shown below,
[tex]v = r\omega \rightarrow \omega = \frac{v}{r}[/tex]
Here,
v = Lineal velocity
[tex]\omega[/tex]= Angular velocity
r = Radius
Our values are
[tex]v = 6/ms[/tex]
[tex]r = \frac{d}{2} = \frac{120*10^{-3}}{2} = 0.06m[/tex]
Replacing to find the angular velocity we have,
[tex]\omega = \frac{6m/s}{0.06m}[/tex]
[tex]\omega = 100rad/s[/tex]
Convert the units to RPM we have that
[tex]\omega = 100rad/s (\frac{1rev}{2\pi rad})(\frac{60s}{1m})[/tex]
[tex]\omega = 955.41rpm[/tex]
Therefore the angular speed of the wheels when the scooter is moving forward at 6.00 m/s is 955.41rpm
The angular speed of the scooter's wheels when the scooter is moving at 6.00 m/s is 100 rad/sec. This value is calculated using the formula for relating linear velocity, radius, and angular speed, and converting the wheel's diameter to a radius in meters.
Explanation:To find the angular speed of the scooter's wheels, we need to use the equation that relates linear velocity (v), radius (r), and angular speed (w). This equation is v = r*w where v is the linear speed, r is the radius, and w is the angular speed which we are trying to find.
First, radius r needs to be calculated using the provided diameter as r = diameter / 2 = 120 mm / 2 = 60 mm. Since the linear speed is provided in m/s, we need to convert the radius from mm to m. So, r = 60 mm = 0.06 m.
Then, we can substitute the known values into the equation. 6 m/s = 0.06 m * w, and solve for w: w = (6 m/s) / 0.06 m = 100 rad/s. Therefore, the angular speed of the wheels when the scooter is moving forward at 6.00 m/s is 100 rad/sec.
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A particle moves along the x axis. It is initially at the position 0.270 m, moving with velocity 0.140 m/s and acceleration 20.320 m/s2. Suppose it moves as a particle under constant acceleration for 4.50 s. Find (a) its position and (b) its velocity at the end of this time interval. Next, assume it moves as a particle in simple harmonic motion for 4.50 s and x 5 0 is its equilibrium position. Find (c) its position and (d) its velocity at the end of this time interval.
The position and velocity of the particle in equilibrium position at the given parameters are;
A) x = -2.34 m
B) v_x = -1.3 m/s
C) x(4.5) = -0.076 m
D) v = 0.314 m/s
We are given;
Initial distance; x_i = 0.27 m
Initial velocity; v_xi = 0.14 m/s
Acceleration; a_x = - 0.32 m/s²
Time; t = 4.5 s
A) Formula for the particle's position as a function of time under constant acceleration is;
x = x_i + v_xi•t + ½a_x•t²
x = 0.27 + (0.14 × 4.5) + ½(-0.32 × 4.5²)
x = -2.34 m
B) Formula for it's velocity at the end of the time interval is;
v_x = v_xi + a_x•t
v_x = 0.14 + (-0.32 × 4.5)
v_x = -1.3 m/s
C) Formula for position in simple harmonic motion is;
x(t) = A cos(ωt + ϕ)
We know that acceleration is;
a = -ω²x
Thus;
-0.32 = -ω²(0.27)
ω = √(0.32/0.27)
ω = 1.089 rad/s
Now, velocity is the derivative of x(t). Thus;
v(t) = x'(t) = -Aω sin (ωt + ϕ)
At t = 0, we have;
0.14 = -A(1.089) × sin ϕ - - -(1)
Also, at t = 0,
0.27 = A cos ϕ - - - (2)
Divide equation 1 by equation 2 to get;
0.14/0.27 = -1.089 tan ϕ
ϕ = tan^(-1) (0.14/(0.27 × -1.089))
ϕ = -25.46°
Thus, putting -25.46° for ϕ in eq 2 gives;
0.27 = A cos (-25.46)
0.27 = A × 0.90183
A = 0.27/0.90183
A = 0.2994
Thus,
x(4.5) = 0.2994 cos((1.089 × 4.5) + (-25.46))
x(4.5) = -0.076 m
D) v = -0.2994 × 1.089 × sin 254.6
v = 0.314 m/s
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The position of the particle after 4.50 s of constant acceleration is 207.360 m, and its velocity is 91.580 m/s. In simple harmonic motion, the position of the particle at the end of 4.50 s is 0 m, and its velocity is -1.080 m/s.
Explanation:(a) Position:
To find the position of the particle after 4.50 s, we can use the equation x = x0 + v0t + 0.5at^2, where x is the final position, x0 is the initial position, v0 is the initial velocity, a is the acceleration, and t is the time interval.
Plugging in the given values:
x = 0.270 m + (0.140 m/s)(4.50 s) + 0.5(20.320 m/s^2)(4.50 s)^2
x = 0.270 m + 0.630 m + 206.460 m
x = 207.360 m
Therefore, the position of the particle at the end of 4.50 s is 207.360 m.
(b) Velocity:
To find the velocity of the particle at the end of 4.50 s, we can use the equation v = v0 + at, where v is the final velocity.
Plugging in the given values:
v = 0.140 m/s + (20.320 m/s^2)(4.50 s)
v = 0.140 m/s + 91.440 m/s
v = 91.580 m/s
Therefore, the velocity of the particle at the end of 4.50 s is 91.580 m/s.
(c) Position:
Since the particle is in simple harmonic motion, its position can be described by the equation x = x0 + A* sin(ωt + φ), where x0 is the equilibrium position, A is the amplitude, ω is the angular frequency, t is the time, and φ is the phase constant.
Plugging in the given values:
x = 0 + 0.270*sin(4.00 rad/s * 4.50 s + 0)
x ≈ 0.270*sin(18.000 rad)
x ≈ 0.270*sin(π rad)
x ≈ 0 m
Therefore, the position of the particle at the end of 4.50 s in simple harmonic motion is 0 m.
(d) Velocity:
The velocity of the particle in simple harmonic motion can be described by the equation v = A*ω*cos(ωt + φ).
Plugging in the given values:
v = 0.270*4.00*cos(4.00 rad/s * 4.50 s + 0)
v ≈ 1.080*cos(18.000 rad)
v ≈ 1.080*cos(π rad)
v ≈ -1.080 m/s
Therefore, the velocity of the particle at the end of 4.50 s in simple harmonic motion is -1.080 m/s.
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Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 18 m/s at an angle 42 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground.
1) What is the horizontal component of the ball’s velocity when it leaves Julie's hand?
2) What is the vertical component of the ball’s velocity when it leaves Julie's hand?
3) What is the maximum height the ball goes above the ground?
4) What is the distance between the two girls?
5) After catching the ball, Sarah throws it back to Julie. The ball leaves Sarah's hand a distance 1.5 meters above the ground, and is moving with a speed of 14 m/s when it reaches a maximum height of 10 m above the ground.
What is the speed of the ball when it leaves Sarah's hand?
6) How high above the ground will the ball be when it gets to Julie? (note, the ball may go over Julie's head.)
Answer:
1) 13.377 m/s
2) 12.044 m/s
3) 8.893 m
4) 32.85 m
5) 19.05 m/s
6) 3.25 m
Explanation:
1)
V_o,x = V_o * cos (Q)
V_o,x = 18 * cos (42)
V_o,x = 13.377 m/s
2)
V_o,y = V_o * sin (Q)
V_o,y = 18 * sin (42)
V_o,y = 12.044 m/s
3)
Maximum height is reached when V,y = 0
V,y = V_o,y + a*t
0 = 12.044 - 9.81t
Solve above equation for t:
t = 1.228 s
Compute S_y @t = 1.228 s
S_y = S_o,y + V_o,y*t + 0.5*a*t^2
S_y = 1.5 + 12.044*1.228 - 4.905*1.228^2
S_y = 8.893 m
4)
Time taken for the ball to complete path:
S_y = S_o,y + V_o,y*t + 0.5*a*t^2 = 1.5
V_o,y*t + 0.5*a*t^2 = 0
12.044*t - 4.905*t^2 = 0
t = 0, t = 2.455 s
Total distance traveled in horizontal direction S_x @ t = 2.455 s
S_x = S_o,x + V_o,x*t
S_x = 0 + 13.377*2.455 = 32.85 m
5)
S_y = S_o,y + V_o,y*t + 0.5*a*t^2 = 10
10 = 1.5 + V_o,y*t -4.905*t^2 .... Eq 1
Maximum height is reached when V,y = 0
V,y = V_o,y + a*t
0 = V_o,y - 9.81t .... Eq2
Solve Eq 1 and Eq 2 simultaneously
V_o,y = 9.81*t
10 = 1.5 + 9.81*t^2 -4.905*t^2
8.5 = 4.905*t^2
t = 1.316 s
V_o,y = 12.914 m/s
Compute Velocity
V = sqrt (V_o,x^2 + V_o,y^2)
V = sqrt (14^2 + 12.914^2)
V = 19.05 m/s
6)
Total distance traveled in horizontal direction between players is 32.85m
S_x = S_o,x + V_o,x*t
S_x = 0 + 14*t = 32.85 m
t = 2.3464 s
Compute Sy @ t = 2.3464 s
S_y = S_o,y + V_o,y*t + 0.5*a*t^2
S_y = 10 - 4.905*(1.1732)^2
S_y = 3.25 m
If an evil genius decided to free the Earth from the Sun by charging both (with an equal charge) to generate an electrical force equal to the gravitational force between them, how much charge would be needed on each?
Answer:
[tex]2.96866\times 10^{17}\ C[/tex]
Explanation:
G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²
k = Coulomb constant = [tex]8.99\times 10^{9}\ Nm^2/C^2[/tex]
r = Distance between the objects and particles
[tex]q_1=q_2[/tex] = Charges
M = Mass of Sun = [tex]1.989\times 10^{30}\ kg[/tex]
m = Mass of Earth = [tex]5.972\times 10^{24}\ kg[/tex]
Here, the Electric force will balance the gravitational force
[tex]\dfrac{GMm_2}{r^2}=\dfrac{kq_1q_2}{r^2}\\\Rightarrow q=\sqrt{\dfrac{GMm}{k}}\\\Rightarrow q=\sqrt{\dfrac{6.67\times 10^{-11}\times 5.972\times 10^{24}\times 1.989\times 10^{30}}{8.99\times 10^{9}}}\\\Rightarrow q=2.96866\times 10^{17}\ C[/tex]
Charge on each particle will be [tex]2.96866\times 10^{17}\ C[/tex]
What is the speed of a car going v=1.000mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately. Use the facts that 1mile=1609m and 1hour=3600s. Express your answer i
Answer: 0.4469 m/s
Explanation:
First, convert mile into meters.
1 mile = 1609 m
Secondly, convert hour into seconds
1 hour = 3600 s
Finally, convert 1.000 mph to meters per second.
1.000 mph is same as 1 mile / 1 hour
Put SI units we converted earlier.
1 mile / 1 hour = 1609 m / 3600 s
1 mile / 1 hour = 0.4469 m/s
The appropriate solution is "0.4469 m/s". A further explanation is provided below.
According to the question,
Speed of a car, v = 1.000 mphGiven facts:
1 mile = 1609 m1 hour = 3600 sThe speed of the car will be:
= [tex]1 \ mile/hour[/tex]
By substituting the above given values, we get
= [tex]1.000\times \frac{1609 \ m}{3600 \ s}[/tex]
= [tex]1.000\times 0.447[/tex]
= [tex]0.4469 \ m/s[/tex]
Thus the above solution is correct.
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Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with n = 5 in a one-dimensional box 45.7 pm in length.
Answer: wavelength λ = 2.9Å
Explanation:
Using the particle in a box model. The energy level level increases with n^2
En = (n^2h^2)/ 8mL^2 .....1
For the ground state, n = 1 to level n= 5, the energy level changes from E1 to E5
∆E = (5^2 - 1^2)h^2/8mL^2
but 5^2 - 1^2 = 24.
so,
∆E = 24h^2/8mL^2 .....2
And the wavelength of the radiation can be derived from the equation below:
E = hc/λ
λ = hc/E .......3
Substituting equation 2 to 3
λ = hc/[(24h^2)/ 8mL^2]
λ = 8mcL^2/(24h)
λ = 8mcL^2/24h .....4
Where,
n = energy state
h = Planck's constant = 6.626 × 10^-34 Js
m= mass of electron = 9.1 × 10^-31 kg
L = length = 45.7pm = 45.7×10^-12 m
E = energy
c= speed of light = 3.0 ×10^8 m/s
λ= wavelength
Substituting the values into equation 4 above
λ = [(8×9.1×3×45.7^2)/(24×6.626)] × 10^(-31+8-24+34)
λ = 2868.285390884 × 10^-13 m
λ = 2.9 × 10^-10 m
λ = 2.9Å
The wavelength of the electromagnetic radiation required to excite an electron can be calculated using the formula wavelength = (2 * box length) / n, where n is the energy level. The wavelength of the electromagnetic radiation required is 9.14 pm.
Explanation:To calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with n = 5 in a one-dimensional box, we can use the formula:
wavelength = (2 * box length) / n
Given that the box length is 45.7 pm and n = 5, we can substitute the values into the formula:
wavelength = (2 * 45.7 pm) / 5
Simplifying the expression gives us:
wavelength = 9.14 pm
Therefore, the wavelength of the electromagnetic radiation required is 9.14 pm.
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Ricardo and Jane are standing under a tree in the middle of a pasture. An argument ensues, and they walk away in different directions. Ricardo walks 27.0 m in a direction 60.0 ∘ west of north. Jane walks 16.0 m in a direction 30.0 ∘ south of west. They then stop and turn to face each other. In what direction should Ricardo walk to go directly toward Jane?
Answer:
the direction that should be walked by Ricardo to go directly to Jane is 23.52 m, 24° east of south
Explanation:
given information:
Ricardo walks 27.0 m in a direction 60.0 ∘ west of north, thus
A= 27
Ax = 27 sin 60 = - 23.4
Ay = 27 cos 60 = 13.5
Jane walks 16.0 m in a direction 30.0 ∘ south of west, so
B = 16
Bx = 16 cos 30 = -13.9
By = 16 sin 30 = -8
the direction that should be walked by Ricardo to go directly to Jane
R = √A²+B² - (2ABcos60)
= √27²+16² - (2(27)(16)(cos 60))
= 23.52 m
now we can use the sines law to find the angle
tan θ = [tex]\frac{R_{y} }{R_{x} }[/tex]
= By - Ay/Bx -Ax
= (-8 - 13.5)/(-13.9 - (-23.4))
θ = 90 - (-8 - 13.5)/(-13.9 - (-23.4))
= 24° east of south
A spherical surface surrounds a point charge q. Describe what happens to the total flux through the surface if the following happens:
(a) The charge is tripled.
*The flux is tripled.
*The flux decreases by 1/3.
*The flux remains constant.
*The flux goes to zero.
(b) The volume of the sphere is doubled.
*The flux is tripled.
*The flux decreases by 1/3.
*The flux remains constant.
*The flux goes to zero.
(c) The surface is changed to a cube.
*The flux is tripled.
*The flux decreases by 1/3.
*The flux remains constant.
*The flux goes to zero.
(d) The charged is moved to another location inside the surface.
*The flux is tripled.
*The flux decreases by 1/3.
*The flux remains constant.
*The flux goes to zero.
(e) The charge is moved outside the surface.
*The flux is tripled.
*The flux decreases by 1/3.
*The flux remains constant.
*The flux goes to zero.
Gauss' law states that the total charge contained within a closed surface immediately proportionately affects the electric flux through that surface. The flux across the spherical surface will quadruple if the charge is tripled.
The enclosed charge determines the electric flux through a closed surface, not the size or shape of the surface. The quantity of charge confined does not change when the sphere's volume is doubled, hence the flux does not change.
Similar to component (b), the flux is unaffected by changing the surface's shape as long as the enclosed charge stays constant.
The total charge contained by the surface is the only factor that affects the electric flux across a closed surface.
Thus, since there is no longer any charge contained by the closed surface if the charge is transported outside of it, there is no longer any electric flux through the surface.
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The total flux through a spherical surface surrounding a point charge depends on the charge, while the flux through the surface remains constant when the volume of the sphere or the shape of the surface is changed. If the charge is moved to another location inside the surface, the total flux remains constant, but if the charge is moved outside the surface, the total flux goes to zero.
Explanation:(a) When the charge is tripled, the total flux through the surface also triples. This is because the total flux is directly proportional to the charge enclosed by the surface.
(b) When the volume of the sphere is doubled, the total flux through the surface remains constant. This is because the total flux is independent of the volume of the surface.
(c) When the surface is changed to a cube, the total flux through the surface remains constant. This is because the total flux is independent of the shape of the surface.
(d) When the charge is moved to another location inside the surface, the total flux through the surface remains constant. This is because the total flux is independent of the position of the charge within the surface.
(e) When the charge is moved outside the surface, the total flux through the surface goes to zero. This is because the total flux is zero when there are no charges enclosed by the surface.
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A charged sphere with 1 × 10 8 units of negative charge is brought near a neutral metal rod. The half of the rod closer to the sphere has a surplus charge of 4 × 10 4 units. What is the charge on the half of the rod farther from the sphere? 0 − 1 × 10 8 1 × 10 8 − 4 × 10 4 4 × 10 4
The charge on the half of the rod farther from the sphere brought near to it, which had initially a neutral charge, is -4×104 units. This is due to a process known as charging by induction.
Explanation:The charge on the half of the rod farther from the sphere is -4×104 units. This occurs due to a process called charging by induction. Basically, when a charged object is brought near to an initially neutral conductor, it polarizes the conductor. Negative charges are attracted towards the charged sphere, leaving the far side of the rod positively charged.
However, the problem statement tells us that there is a surplus of charge on the closer half of the rod, hence the further half must have a deficiency of charge by the same amount, resulting in -4×104 units of charge. Remember, in a neutral object, the total charge is zero. Thus, if we develop a surplus (+4×104) on one side, we must have an equal amount of deficit (-4×104) on the other side to maintain the total charge at zero.
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The pressure reading from a barometer is 742 mm Hg. Express this reading in kilopascals, kPa. (Use 760 mm Hg = 1.013 x 105 Pa)
Answer:
98.9 kPa
Explanation:
given,
Pressure reading of barometer = 742 mm Hg
we know,
760 mm Hg = 1.013 x 10⁵ Pa
[tex]1\ mm\ Hg = \dfrac{1.013\times 10^5}{760}[/tex]
[tex]742\ mm\ Hg = \dfrac{1.013\times 10^5}{760}\times 742[/tex]
= 0.989 x 10⁵ Pa
= 98.9 x 10³ Pa
= 98.9 kPa
the reading of the barometer is equal to 98.9 kPa
The pressure reading from the barometer expressed in kilopascal is 98.9kPa.
Given that;
Pressure reading from the barometer; [tex]P = 742mmHg[/tex]
Pressure reading from the barometer in kilopascals; [tex]x = \ ?[/tex]
First we convert the units from Millimeter of Mercury (mmHg) to Pascal (Pa)
We are to use;
[tex]760 mm Hg = 1.013 * 10^5 Pa\\\\\frac{760mmHg}{760} = \frac{1.013 * 10^5 Pa}{760} \\\\1mmHg = 1.33289 * 10^2 Pa[/tex]
So,
Pressure reading is pascal
[tex]P = 742 * [1.33289*10^2Pa]\\\\P = 98900.438Pa[/tex]
Next we convert to kilopascal
We know that; [tex]1\ Pascal = 0.001\ kilopascal[/tex]
so
[tex]P = 98900.438 * 0.001 kPa\\\\P = 98.9kPa[/tex]
Therefore, the pressure reading from the barometer expressed in kilopascal is 98.9kPa.
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A circuit consists of a 12.0-V battery connected to three resistors (44ohm , 17ohm and 110ohm ) in series.a. Find the current that flows through the battery.I=__mAb.Find the potential difference across the 44ohm resistor.V1=__Vc.Find the potential difference across the 17ohm resistor.V2=__Vd.Find the potential difference across the 110ohm resistor.V3=__V
Answer:
I = 70.2mA
V1 = 3.09V
V2 = 1.19V
V3 = 7.72V
Explanation:
Total resistance for a series connection = R1 + R2 + R3 = 44ohm + 17ohm + 110ohm = 171ohm
From ohm's law
Voltage (V) = current (I) × resistance (R)
I = V/R = 12/171 = 0.0702A = 0.0702×1000mA = 70.2mA
V1 = I×R1 = 0.0702×44 = 3.09V
V2 = I×R2 = 0.0702×17 = 1.19V
V3 = I×R3 = 0.0702×110 = 7.72V
Answer:
a) I = 0.0702A = 70.2mA
b) V1 = 3.09V
c) V2 = 1.19V
d) V3 = 7.72V
Explanation:
Given that the circuit consist of three series resistors.
For resistors arranged in series, the total resistance R can be given as:
R = R1 + R2 + R3
R1 = 44 ohms
R2 = 17 ohms
R3 = 110 ohms.
R = 44 + 17 + 110 = 171 ohms
V = 12 V
a) The current of a circuit is given by;
Potential difference V = current × total resistance
V = IR
Making I the subject of formula,
I = V/R
I = 12/171 = 0.0702A
I = 7.02mA
b) the potential difference across any resistors is given by:
V = IR
Since the arrangement is parallel, the same current flows through each of the resistors.
V1 = IR1
V1 = 0.0702 × 44
V1 = 3.09V
c) applying the same rule as b above:
V2 = IR2
V2 = 0.0702 × 17
V2 = 1.19V
d) applying the same rule as b above.
V3 = IR3
V3 = 0.0702 × 110
V3 = 7.72V
At the beginning of a basketball game, a referee tosses the ball straight up with a speed of 4.41 m/s. A player cannot touch the ball until after it reaches its maximum height and begins to fall down. What is the minimum time that a player must wait before touching the ball?
To develop this problem we will apply the linear motion kinematic equations. For this purpose we will define the change in speed as the product between acceleration and time.
[tex]v_f-v_i = at[/tex]
The relation between initial velocity final velocity and time is
[tex]v_f = v_i+at[/tex]
The acceleration is due to the acceleration due to gravity, then we have
[tex]v_f = v_i-gt[/tex]
At the maximum height the final velocity is zero. Then we have that
[tex]0 = v_i-gt[/tex]
[tex]t = \frac{v_i}{g}[/tex]
The time the player must wait before touching he ball is
[tex]t = \frac{4.41}{9.8}[/tex]
[tex]t = 0.45s[/tex]
A glass marble is rubbed against a piece of silk. As a resultthe piece of fabric acquires extra electrons.
What happens to theglass marble?
a)The marble has lost the same number ofelectrons acquired by the piece of silk.
b)The marble acquires a positive charge andrepels the piece of silk.
c)The marble acquires a negative charge andattracts the piece of silk.
d)The marble has acquired the same numberof electrons acquired by the piece of silk.
e)The marble acquires a positive charge andattracts the piece of silk.
f)The marble acquires a negative charge andrepels the piece of silk.
Answer:
the marble has lost the same number of electrons acquired by the piece of silk.
the marble acquires a positive charge and attracts the piece of silk.
Explanation:
When an object or a material acquires extra electrons it becomes negatively charged while when it losses electrons it becomes positively charged. The glass marble was rubbed against the silk cloth, and the silk cloth acquires extra electron thereby becoming negatively charged, the same amount of charge the silk cloth acquires was lost from the glass marble thereby causing the marble to become positively charged. Also opposite charges attracts while likes charges repel and due to equal and opposite charge on silk and glass marble, they both will attract each other. thus option A and E is correct.
A 19.2 kg person climbs up a uniform ladder
with negligible mass. The upper end of the
ladder rests on a frictionless wall. The bottom
of the ladder rests on a floor with a rough
surface where the coefficient of static friction
is 0.1 . The angle between the horizontal and
the ladder is θ . The person wants to climb
up the ladder a distance of 0.49 m along the
ladder from the ladder’s foot.
What is the minimum angle θmin (between
the horizontal and the ladder) so that the
person can reach a distance of 0.49 m without
having the ladder slip? The acceleration of
gravity is 9.8 m/s^2
Answer in units of ◦
Answer:
63°
Explanation:
Draw a free body diagram of the ladder. There are 4 forces:
Normal force N pushing up at the base of the ladder.
Friction force Nμ pushing right at the base of the ladder.
Weight force mg pushing down a distance x up the ladder.
Reaction force R pushing left at the top of the ladder.
Sum of forces in the x direction:
∑Fₓ = ma
Nμ − R = 0
R = Nμ
Sum of forces in the y direction:
∑Fᵧ = ma
N − mg = 0
N = mg
Sum of moments about the base of the ladder:
∑τ = Iα
R (L sin θ) − mg (x cos θ) = 0
R (L sin θ) = mg (x cos θ)
Substituting:
Nμ (L sin θ) = mg (x cos θ)
mgμ (L sin θ) = mg (x cos θ)
μ (L sin θ) = x cos θ
tan θ = x / (μL)
θ = atan(x / (μL))
Given x = 0.49 m, μ = 0.1, and L = 2.5 m:
θ = atan(0.49 m / (0.1 × 2.5 m))
θ ≈ 63°
To solve the problem we will first calculate the reaction and the normal force.
The angle of the ladder should be 63°.
Given to us
Distance the person wants to travel, x = 0.49 m,the coefficient of static friction, μ = 0.1, Length of the ladder, L = 2.5 m:Free Body DiagramThere are 4 forcesReaction force R pushing left at the top of the ladder,Normal force N pushes up the ladder at the base of the ladder,Friction force Nμ pushing right at the base of the ladder,Weight force of the person pushing down = mg,Sum of Vertical vector forces,[tex]\sum F_y = 0\\N - mg = 0\\N = mg[/tex]
Sum of Horizontal vectors forces,[tex]\sum F_x = 0\\N\mu - R = 0\\R = N\mu[/tex]
Sum of moments at the base of the ladder[tex]R (L\ sin\theta) - mg (x\ cos\theta) = 0\\R (L\ sin\theta) = mg (x\ cos\theta)[/tex]
Substituting the values of R and N,
[tex]N\mu (L\ sin \theta) = mg (x\ cos \theta)\\mg\mu (L\ sin \theta) = mg (x\ cos\theta)\\\mu (L\ sin \theta) = x\ cos \theta\\tan \theta = \dfrac{x}{\mu L}\\\theta = tan^{-1}( \dfrac{x}{\mu L})[/tex]
Substituting the values,
[tex]\theta = tan^{-1}(\dfrac{0.49\ m}{0.1\times 2.5 m})\\\\\theta = tan^{-1} (0.96)\\\\\theta = 62.969^o \approx 63^o[/tex]
Hence, the angle of the ladder should be 63°.
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At the equator, the radius of the Earth is approximately 6370 km. A plane flies at a very low altitude at a constant speed of v = 219 m/s. Upon landing, the jet can produce an average deceleration of a=17 m/s^2. How long will it take the plane to circle the Earth at the equator?
The time it takes for the plane to circle the Earth at the equator is approximately 182588 seconds or about 50.72 hours.
Explanation:In order to calculate the time it takes for the plane to circle the Earth at the equator, we need to determine the distance of the circumference of the Earth at the equator. The circumference of a circle is given by the formula C = 2πr, where r is the radius of the circle. In this case, the radius is approximately 6370 km. Plugging this value into the formula, we get C ≈ 2π(6370 km) ≈ 40030 km.
Next, we can calculate the time it takes for the plane to travel this distance by using the formula time = distance / speed. The speed of the plane is given as v = 219 m/s, which is equivalent to approximately 0.219 km/s. Therefore, the time it takes for the plane to circle the Earth at the equator is approximately 40030 km / 0.219 km/s ≈ 182588 seconds (or about 50.72 hours).
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A hot-air balloon of diameter 12 mm rises vertically at a constant speed of 15 m/sm/s. A passenger accidentally drops his camera from the railing of the basket when it is 18 mm above the ground. If the balloon continues to rise at the same speed, how high is the railing when the camera hits the ground?
To solve this problem we will apply the linear motion kinematic equations. With the information provided we will calculate the time it takes for the object to fall. From that time, considering that the ascent rate is constant, we will take the reference distance and calculate the distance traveled while the object hit the ground, that is,
[tex]h = v_0 t -\frac{1}{2} gt^2[/tex]
[tex]-18 = 15*t + \frac{1}{2} 9.8*t^2[/tex]
[tex]t = 3.98s[/tex]
Then the total distance traveled would be
[tex]h = h_0 +v_0t[/tex]
[tex]h = 18+15*3.98[/tex]
[tex]h = 77.7m[/tex]
Therefore the railing will be at a height of 77.7m when it has touched the ground
The height is the railing when the camera hits the ground should be considered as the 77.7 m.
Calculation o fthe height:Since we know that
[tex]h = vt - 1/2gt^2\\\\-18 = 15*1 + 1/2*9.8*t^2[/tex]
t = 3.98s
Now the total distance should be
[tex]= 18 + 15*3.98[/tex]
= 77.7 m
hence, The height is the railing when the camera hits the ground should be considered as the 77.7 m.
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An 80-cm-long, 1.0-mm-diameter steel guitar string must betightened to a tension of 2000 {\rm N} by turning the tuningscrews.By how much is the string stretched? (In 2 sig figs and cm)
Answer:
string stretched is 1.02 cm
Explanation:
given data
length = 80-cm
diameter = 1.0-mm
tension = 2000 N
solution
we get here string stretched that will be as and here
we know that young modulus for steel = 200 × [tex]10^{9}[/tex]
so here stress will be
stress = y × strain .............1
that is express as
[tex]\frac{force}{area} = \frac{Y \Delta L}{L}[/tex]
ΔL = [tex]\frac{0.80*2000}{\pi * 0.0005^2*200*10^9}[/tex]
ΔL = 0.0102 m
ΔL = 1.02 cm
so string stretched is 1.02 cm
You were driving a car with velocity <19, 0, 23> m/s. You quickly turned and braked, and your velocity became <14, 0, 26> m/s. The mass of the car was 1300 kg. (a) What was the (vector) change in momentum during this maneuver? Pay attention to signs. < -6500 , 0 , 3900 > kg·m/s (b) What was the (vector) impulse applied to the car?
Answer:
a.<-6500,0,3900>kgm/s
b.<-6500,0,3900>kgm/s
Explanation:
We are given that
Initial velocity of car,u=[tex]<19,0,23>[/tex]m/s
Final velocity of car=[tex]v=<14,0,26>m/s[/tex]
Mass of the car=m=1300 kg
a.We have to find the change in momentum during this manuver.
Change in momentum=[tex]\Delta P=m(v-u)[/tex]
Using the formula
[tex]\Delta P=1300(<14,0,26>-<19,0,23>)=1300(<-5,0,3>)=<-6500,0,3900>kgm/s[/tex]
Hence, the change in momentum during this maneuver=<-6500,0,3900>kgm/s
b.Impulse =Change in momentum of car
Impulse applied to the car=<-6500,0,3900>kgm/s
A 50 kg child runs off a dock at 2.0 ms (horizontally) and lands in a waiting rowboat of mass 150 kg. At what speed does the rowboat move away from the dock?
Answer:
The boat moves away from the dock at 0.5 m/s.
Explanation:
Hi there!
Since no external forces are acting on the system boy-boat at the moment at which the boy lands on the boat, the momentum of the system is conserved (i.e. it remains constant).
The momentum of the system is calculated as the sum of the momentum of the boy plus the momentum of the boat. Before the boy lands on the boat, the momentum of the system is given by the momentum of the boy.
momentum of the system before the boy lands on the boat:
momentum of the boy + momentum of the boat
m1 · v1 + m2 · v2 = momentum of the system
Where:
m1 and v1: mass and velocity of the boy.
m2 and v2: mass and velocity of the boat.
Then:
50 kg · 2.0 m/s + 150 kg · 0 m/s = momentum of the system
momentum of the system = 100 kg m/s
After the boy lands on the boat, the momentum of the system will be equal to the momentum of the boat moving with the boy on it:
momentum of the system = (m1 + m2) · v (where v is the velocity of the boat).
100 kg m/s = (50 kg + 150 kg) · v
100 kg m/s / 200 kg = v
v = 0.5 m/s
The boat moves away from the dock at 0.5 m/s.
Final answer:
The child running off a dock and landing in a rowboat scenario involves applying the conservation of momentum principle to find the boat's final velocity. The speed of the rowboat is 0.67 m/s.
Explanation:
Given:
Child mass (m1) = 50 kg
Child velocity (v1) = 2.0 m/s
Boat mass (m2) = 150 kg
Let the final velocity of the boat be v2
Using the conservation of momentum:
m1v1 = (m1 + m2)v2
Substitute the values to find v2: 50 kg * 2.0 m/s = (50 kg + 150 kg) * v2
Solving for v2, we get v2 = 0.67 m/s
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Three point charges are arranged in a line. Charge q 3 = +5 nC is at the origin. Charge q 2 = -3 nC is located at x- +4.00 cm. Charge q 1 is at x= + 2.00 cm. What is q 1, in magnitude and sign, if the net force on q3 is zero?
Answer:
q1= +0.75 nC
Explanation:
As the electrostatic force is linear, we can apply the superposition principle to calculate the total force on q₃ due to q₂ and q1, according to Coulomb's Law, as follows:
F₃₂ = k*q₃*q₂/r₃₂² = 9*10⁹ N*m²/C²*+5nC*(-3 nC) / (0.04m)² = -84.4*10⁻⁶ N
F₃₁ = k*q₃*q₁ / r₃₁² = 9*10⁹ N*m²/C²*q₁*(+5 nC) / (0.02m)²
The total force on q₃ is just the sum of F₃₂ and F₃₁, which must add to 0, as follows:
F₃ = F₃₂ + F₃₁ = 0
⇒ -84.4* 10⁻⁶ N = -9*10⁹ N*m²/C²*q₁*(+5 nC) / (0.02m)²
Solving for q₁, we get:
q₁ = (84.4 / 11.25)*10⁻¹⁰ C = +0.75 nC
q₁ must be positive, in order to counteract the attractive force on q₃ due to q₂.
At a certain instant a particle is moving in the +x direction with momentum +8 kg m/s. During the next 0.13 seconds a constant force acts on the particle, with Fx=-7N and Fy= +5N.
What is the magnitude of the momentum of the particle at the end of this 0.13-second interval?
Answer:
The momentum of the particle at the end of the 0.13 s time interval is 7.12 kg m/s
Explanation:
The momentum of the particle is related to force by the following equation:
Δp = F · Δt
Where:
Δp = change in momentum = final momentum - initial momentum
F = constant force.
Δt = time interval.
Let´s calculate the x-component of the momentum after the 0.13 s:
final momentum - 8 kg m/s = -7 N · 0.13 s
final momentum = -7 kg m/s² · 0.13 s + 8 kg m/s
final momentum = 7.09 kg m/s
Now let´s calculate the y-component of the momentum vector after the 0.13 s. Since the particle wasn´t moving in the y-direction, the initial momentum in this direction is zero:
final momentum = 5 kg m/s² · 0.13 s
final momentum = 0.65 kg m/s
Then, the mometum vector will be as follows:
p = (7.09 kg m/s, 0.65 kg m/s)
The magnitude of this vector is calculated as follows:
[tex]|p| = \sqrt{(7.09 kg m/s)^{2} + (0.65 kg m/s)^{2}} = 7.12 kg m/s[/tex]
The momentum of the particle at the end of the 0.13 s time interval is 7.12 kg m/s
How much work is done by the motor in a CD player to make a CD spin, starting from rest? The CD has a diameter of 12.70 cm and a mass of 16.30 g. The laser scans at a constant tangential velocity of 1.150 m/s. Assume that the music is first detected at a radius of 20.90 mm from the center of the disk. Ignore the small circular hole at the CD's center.
Final answer:
The work done by the motor in a CD player to make the CD spin can be calculated using the formula: Work = Torque * Angle. The final angular velocity can be calculated using the formula: v = r * ω. The moment of inertia can be calculated using the formula: Moment of Inertia = (1/2) * Mass * Radius^2.
Explanation:
The work done by the motor in a CD player to make the CD spin can be calculated using the formula:
Work = Torque * Angle
In this case, since the CD starts from rest, the initial angular velocity is zero. The final angular velocity can be calculated using the formula:
v = r * ω
where r is the radius of the CD and ω is the angular velocity.
The torque can be calculated using the formula:
Torque = Moment of Inertia * Angular Acceleration
Since we have the mass and diameter of the CD, the moment of inertia can be calculated using the formula:
Moment of Inertia = (1/2) * Mass * Radius^2
Once we have the torque and the angle, we can calculate the work done by the motor.