Explanation:
It is given that,
Mass of bumper car, m₁ = 202 kg
Initial speed of the bumper car, u₁ = 8.5 m/s
Mass of the other car, m₂ = 355 kg
Initial velocity of the other car is 0 as it at rest, u₂ = 0
Final velocity of the other car after collision, v₂ = 5.8 m/s
Let p₁ is momentum of of 202 kg car, p₁ = m₁v₁
Using the conservation of linear momentum as :
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
[tex]202\ kg\times 8.5\ m/s+355\ kg\times 0=m_1v_1+355\ kg\times 5.8\ m/s[/tex]
p₁ = m₁v₁ = -342 kg-m/s
So, the momentum of the 202 kg car afterwards is 342 kg-m/s. Hence, this is the required solution.
An air bubble of volume 20 cm³ is at the bottom of a lake 40 m deep, where the temperature is 4.0°C. The bubble rises to the surface, which is at a temperature of 20°C.Take the temperature of the bubble’s air to be the same as that of the surrounding water. Just as the bubble reaches the surface, what is its volume?
Answer:
100 cm³
Explanation:
Use ideal gas law:
PV = nRT
where P is absolute pressure, V is volume, n is number of moles, R is ideal gas constant, and T is absolute temperature.
n and R are constant, so:
P₁V₁/T₁ = P₂V₂/T₂
If we say point 1 is at 40m depth and point 2 is at the surface:
P₂ = 1.013×10⁵ Pa
T₂ = 20°C + 273.15 = 293.15 K
P₁ = ρgh + P₂
P₁ = (1000 kg/m³ × 9.8 m/s² × 40 m) + 1.013×10⁵ Pa
P₁ = 4.933×10⁵ Pa
T₁ = 4.0°C + 273.15 = 277.15 K
V₁ = 20 cm³
Plugging in:
(4.933×10⁵ Pa) (20 cm³) / (277.15 K) = (1.013×10⁵ Pa) V₂ / (293.15 K)
V₂ = 103 cm³
Rounding to 1 sig-fig, the bubble's volume at the surface is 100 cm³.
The magnitude of Earth’s magnetic field is about 0.5 gauss near Earth’s surface. What’s the maximum possible magnetic force on an electron with kinetic energy of 1 keV? Compare with the gravitational force on the electron.
Answer:
[tex]F = 1.5 \times 10^{-16} N[/tex]
this force is [tex]1.68 \times 10^{13}[/tex] times more than the gravitational force
Explanation:
Kinetic Energy of the electron is given as
[tex]KE = 1 keV[/tex]
[tex]KE = 1 \times 10^3 (1.6 \times 10^{-19}) J[/tex]
[tex]KE = 1.6 \times 10^{-16} J[/tex]
now the speed of electron is given as
[tex]KE = \frac{1}{2}mv^2[/tex]
now we have
[tex]v = \sqrt{\frac{2 KE}{m}}[/tex]
[tex]v = 1.87 \times 10^7 m/s[/tex]
now the maximum force due to magnetic field is given as
[tex]F = qvB[/tex]
[tex]F = (1.6\times 10^{-19})(1.87 \times 10^7)(0.5 \times 10^{-4})[/tex]
[tex]F = 1.5 \times 10^{-16} N[/tex]
Now if this force is compared by the gravitational force on the electron then it is
[tex]\frac{F}{F_g} = \frac{1.5 \times 10^{-16}}{9.1 \times 10^{-31} (9.8)}[/tex]
[tex]\frac{F}{F_g} = 1.68 \times 10^{13}[/tex]
so this force is [tex]1.68 \times 10^{13}[/tex] times more than the gravitational force
Final answer:
The maximum magnetic force on an electron in Earth's magnetic field is calculated using the charge of the electron, its velocity derived from kinetic energy, and the field strength. This force is much larger than the gravitational force acting on the electron due to its minuscule mass.
Explanation:
The maximum possible magnetic force on an electron moving through Earth's magnetic field can be found using the formula F = qvB sin(\theta), where q is the charge of the electron, v is its velocity, B is the magnetic field strength, and \theta is the angle between the velocity and the magnetic field. Since the maximum force occurs when the angle is 90 degrees (sin(\theta) = 1), we first need to calculate the velocity from its kinetic energy, 1 keV. Given the kinetic energy E = 1 keV = 1 × 103 eV and using the relation E = \frac{1}{2}mv2, we can find v. The electron charge is q = -1.6 × 10-19 C, and the magnetic field is B = 0.5 G = 5 × 10-5 T.
For the gravitational force, we use F = mg, where m is the mass of the electron and g is the acceleration due to gravity, approximately 9.8 N/kg on the surface of Earth. The mass of the electron is about 9.11 × 10-31 kg. Comparing these forces, the magnetic force is several orders of magnitude greater than the gravitational force acting on an electron due to its negligible mass.
What is a plank in science?
Answer:
It's a long explanation
Explanation:
The Planck mass is approximately the mass of the Planck particle, a hypothetical minuscule black hole whose Schwarzschild radius equals the Planck length. In physics, the Planck mass, denoted by mP, is the unit of mass in the system of natural units known as Planck units. It is approximately 0.02 milligrams. Plank length as the minimum distance at which space can be thought. In physics, the Planck length, denoted ℓP, is a unit of length that is the distance light travels in one unit of Planck time. It is equal to 1.616255×10⁻³⁵ m. It is a base unit in the system of Planck units, developed by physicist Max Planck...I miss you, Landon.
What is the escape speed (in km/s) from an Earth-like planet with mass 6.5e+24 kg and radius 55.0 × 105 m? Use the gravitational constant G = 6.67 × 10-11 m3 kg-1 s-2.
Answer:
Escape velocity, v = 12.6 km/s
Explanation:
It is given that,
Mass of earth like planet, [tex]m=6.5\times 10^{24}\ kg[/tex]
Radius of planet, [tex]r=55\times 10^5\ m[/tex]
The escape velocity of a planet is given by the following formula as:
[tex]v=\sqrt{\dfrac{2Gm}{r}}[/tex]
G = universal gravitational constant
[tex]v=\sqrt{\dfrac{2\times 6.67\times 10^{-11}\ m^3kg^{-1}s^{-2}\times 6.5\times 10^{24}\ kg}{55\times 10^5\ m}[/tex]
v = 12556.05 m/s
or
v = 12.6 km/s
Hence, this is the required solution.
What would the electrostatic force be for two 0.005C charges 50m apart?
Answer:
90 N
Explanation:
The electrostatic force between two charges is given by:
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1, q2 are the two charges
r is the separation between the charges
In this problem we have
q1 = q2 = 0.005 C
r = 50 m
So the electrostatic force is
[tex]F=(9\cdot 10^9 N m^2 C^{-2})\frac{(0.005 C)^2}{(50 m)^2}=90 N[/tex]
The escape velocity is defined to be the minimum speed with which an object of mass m must move to escape from the gravitational attraction of a much larger body, such as a planet of total mass M. The escape velocity is a function of the distance of the object from the center of the planet R, but unless otherwise specified this distance is taken to be the radius of the planet because it addresses the question "How fast does my rocket have to go to escape from the surface of the planet?"
Answer: [tex]V=\sqrt{\frac{2GM}{R}}[/tex]
Explanation:
Taking into account what is stated in this problem and considering there is no friction during the takeoff of the rocket of the planet, the rocket will escape the gravitational attraction of the massive body when its kinetic energy [tex]K[/tex] and its potential energy [tex]P[/tex] are equal in magnitude.
Written mathematically is:
[tex]K=P[/tex] (1)
Where:
[tex]K=\frac{1}{2}mV^{2}[/tex] (2)
Being [tex]m[/tex] the mass of the rocket
And:
[tex]P=-\frac{GMm}{R}[/tex] (3)
Being [tex]M[/tex] the mass of the planet, [tex]G[/tex] the gravitational constant and [tex]R[/tex] the radius of the planet.
Substituting (2) and (3) in (1):
[tex]\frac{1}{2}mV^{2}=-\frac{GMm}{R}[/tex] (4)
Finding [tex]V[/tex], which is the escape velocity:
[tex]V=\sqrt{\frac{2GM}{R}}[/tex] this is the velocity the rocket must have in order to escape from the surface of the planet
The critical angle for a liquid in air is 520, What is the liquid's index of refraction? 0.62 0.79 1.27 1.50
Answer:
Liquid's index of refraction, n₁ = 1.27
Explanation:
It is given that,
The critical angle for a liquid in air is, [tex]\theta_c=52^o[/tex]
We have to find the refractive index of the liquid. Critical angle of a liquid is defined as the angle of incidence in denser medium for which the angle of refraction is 90°.
Using Snell's law as :
[tex]n_1sin\theta_c=n_2sin\theta_2[/tex]
Here, [tex]\theta_2=90[/tex]
[tex]sin\theta_c=\dfrac{n_2}{n_1}[/tex]
Where
n₂ = Refractive index of air = 1
n₁ = refractive index of liquid
So,
[tex]n_1=\dfrac{n_2}{sin\theta_c}[/tex]
[tex]n_1=\dfrac{1}{sin(52)}[/tex]
n₁ = 1.269
or n₁ = 1.27
Hence, the refractive index of liquid is 1.27
A 230-km-long high-voltage transmission line 2.0 cm in diameter carries a steady current of 1,100 A. If the conductor is copper with a free charge density of 8.5 1028 electrons per cubic meter, how many years does it take one electron to travel the full length of the cable? (Use 3.156 107 for the number of seconds in a year.)
Answer:
28.23 years
Explanation:
I = 1100 A
L = 230 km = 230, 000 m
diameter = 2 cm
radius, r = 1 cm = 0.01 m
Area, A = 3.14 x 0.01 x 0.01 = 3.14 x 10^-4 m^2
n = 8.5 x 10^28 per cubic metre
Use the relation
I = n e A vd
vd = I / n e A
vd = 1100 / (8.5 x 10^28 x 1.6 x 10^-19 x 3.14 x 10^-4)
vd = 2.58 x 10^-4 m/s
Let time taken is t.
Distance = velocity x time
t = distance / velocity = L / vd
t = 230000 / (2.58 x 10^-4) = 8.91 x 10^8 second
t = 28.23 years
Answer:
28.23 years
Explanation:
It takes 28.23 years to take one electron to travel the full length of the cable.
3.156 107 = number of seconds in a year.
230000 / (2.58 x 10^-4) = 8.91 x 10^8 second.
When an object moves in uniform circular motion, the direction of its acceleration is A) in the same direction as its velocity vector. B) in the opposite direction of its velocity vector C) is directed toward the center of its circular path. D) is directed away from the center of its circular path. E) depends on the speed of the object.
Hello There!
When an object moves in uniform circular motion, the direction of its acceleration is directed toward the center of its circular path.
Uniform circular motion is a certain object or thing that that is traveling in a circular path. The reason why "uniform" is there because a part of it has to stay constant.
Answer:
C) is directed toward the center of its circular path.
Explanation:
Uniform Circular Motion happens when its trajectory is a circumference and its velocity modulus remains constant over time.
In our daily life we often observe the movement made by fans, car wheels and also by the blender. These are all examples of devices that use MCU.
Within the study of uniform circular motion there is the presence of centripetal acceleration, ie when there is speed variation there is acceleration.
Centripetal acceleration is always directed to the center of the circumference. It does not change the modulus of velocity and its mathematical representation is given by the equation:
acp = v2 / R or acp = ω2 R
In 1960 military pilot Joseph Kittinger jumped from a high altitude balloon in a fully pressurized jump suit about 100,000 feet, in the stratosphere, all the way to the ground. When in the stratosphere he felt like he was floating, even though he was free-falling in space. When he reached the troposphere he could feel the wind resistance and it no longer felt like he was floating. Why was this likely the case?
Answer:
because the troposphere has more oxygen than the stratosphere so when he felt like he was floating even though he was free falling it was due to the absence of air.
On a distant planet where the gravitational acceleration is 5.52 m/s^2, an astronaut hangs a 112-gram ball from the end of a wire. She observes the speed of transverse pulse along the wire to be 44.4 m/s. The linear density of the wire is closest to: (a) 0.131 g/m (b) 0.172 g/m (c) 0.227 g/m (d) 0.314 g/m (e) 0.462 g/s
Answer:
The linear density of the wire is 0.314 g/m.
Explanation:
It is given that,
Acceleration, [tex]a=5.52\ m/s^2[/tex]
Mass of the ball, m = 112 gm
Speed of the transverse wave, v = 44.4 m/s
The speed of the transverse wave is given by :
[tex]v=\sqrt{\dfrac{T}{\mu}}[/tex]
Where
T = tension in the wire
[tex]\mu[/tex] = mass per unit length
[tex]\mu=\dfrac{T}{v^2}[/tex]
[tex]\mu=\dfrac{ma}{v^2}[/tex]
[tex]\mu=\dfrac{112\ g\times 5.52\ m/s^2}{(44.4\ m/s)^2}[/tex]
[tex]\mu=0.3136\ g/m[/tex]
or
[tex]\mu=0.314\ g/m[/tex]
So, the linear density of the wire is 0.314 g/m. Hence, this is the required solution.
A tank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. The tank also has a 1 m spout at the top of the tank. The tank is filled with water up to a height of 2 m. Find the work needed to pump all the water out the top of the spout. (Use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)
Answer:
18816π ≈ 59112 Joules
Explanation:
Draw a picture (like the one attached). The cone has a radius R and height H. The spout has height a. The tank is filled with water to height h.
Cut a thin slice from the volume of the water. This slice is a cylindrical disc with a radius r, a thickness dy, and a height y.
Using similar triangles, we can say:
r / y = R / H
The work required to lift this slice up to the spout is:
dW = dm g (H + a − y)
where dm is the mass of the slice and g is the acceleration due to gravity.
Mass is density times volume, so:
dW = dV ρ g (H + a − y)
Substituting the volume of the cylindrical disc:
dW = dy π r² ρ g (H + a − y)
From our similar triangles equation, we know that r = R/H y, so:
dW = dy π (R/H y)² ρ g (H + a − y)
Rearranging:
dW = π (R/H)² ρ g y² (H + a − y) dy
dW = π (R/H)² ρ g ((H + a)y² − y³) dy
The work to lift all the slices between y=0 and y=h is:
W = ∫ dW
W = π (R/H)² ρ g ∫₀ʰ ((H + a)y² − y³) dy
Integrating:
W = π (R/H)² ρ g (⅓(H + a)y³ − ¼y⁴) |₀ʰ
W = π (R/H)² ρ g (⅓(H + a)h³ − ¼h⁴)
Given:
R = 2 m
H = 5 m
a = 1 m
h = 2 m
g = 9.8 m/s²
ρ = 1000 kg/m³
W = π (2/5)² (1000) (9.8) (⅓(5 + 1)(2)³ − ¼(2)⁴)
W = 18816π
W ≈ 59112 Joules
It takes approximately 59.1 kJ of work.
Final answer:
To calculate the work needed to pump water from a conical tank, integrate the volume of water being moved over the distance it must be lifted, considering the tank's dimensions, the spout's height, and the effects of gravity.
Explanation:
The question involves finding the work needed to pump water from a conical tank with a spout at the top. To do this, we need to consider the volume of water to be moved, the height it must be lifted, and the forces involved, including gravity. The water's density (1000 kg/m3) and gravitational acceleration (9.8 m/s2) are key to calculating this work.
The work needed to lift water involves the product of the force required to lift the water, the distance it must be moved, and the volume of water. Given the tank's dimensions and the additional height from the spout, one would typically integrate along the height of the water to compute the total work, considering the changing cross-sectional area of the water column as it is being pumped out.
To find this, one could use the formula for the volume of a cone to model the water's volume at any height and then integrate this volume over the distance it must be moved, accounting for the force of gravity. This problem combines principles of physics and calculus to find a solution.
1. An electron in an atom absorbs a photon with an energy of 2.38 eV and jumps from the n = 2 to n = 4 energy level in the atom. Calculate the wavelength of the photon absorbed by the electron.
2. The electron in the n = 4 level then jumps down to the n = 3 level, emitting a photon with a wavelength of 1.66 ?m. Calculate the energy of the photon emitted.
3. Calculate the difference in energy between the n = 2 and the n = 3 energy levels in this atom.
4. Calculate the frequency of the photon emitted when the electron jumps from the n = 3 to the n = 2 energy level.
1. [tex]1.0\cdot 10^{-6}m[/tex]
First of all, let's convert the energy of the absorbed photon into Joules:
[tex]E=2.38 eV \cdot (1.6\cdot 10^{-19}J/eV)=1.98\cdot 10^{-19} J[/tex]
The energy of the photon can be rewritten as:
[tex]E=\frac{hc}{\lambda}[/tex]
where
h is the Planck constant
c is the speed of light
[tex]\lambda[/tex] is the wavelength of the photon
Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:
[tex]\lambda=\frac{hc}{E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{1.98\cdot 10^{-19} J}=1.0\cdot 10^{-6}m[/tex]
2. 1.24 eV
In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength
[tex]\lambda=1.66\cdot 10^{-6}m[/tex]
So the energy of the emitted photon is given by the formula used previously:
[tex]E=\frac{hc}{\lambda}[/tex]
and using
[tex]\lambda=1.66\cdot 10^{-6}m[/tex]
we find
[tex]E=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{1.0\cdot 10^{-6}m}=1.99\cdot 10^{-19}J[/tex]
converting into electronvolts,
[tex]E=\frac{1.99\cdot 10^{-19} J}{1.6\cdot 10^{-19} J/eV}=1.24eV[/tex]
EDIT: an issue in Brainly does not allow me to add the last 2 parts of the solution - I have added them as an attachment to this post, check the figure in attachment.
A reservoir has a surface area of 30 km^2 and an average depth of 49 m. What mass of water is held behind the dam?
Answer:
Mass of water, [tex]m=1.47\times 10^{12}\ kg[/tex]
Explanation:
Given that,
Surface area of the reservoir, A = 30 km² = 3 × 10⁷ m²
Average depth, d = 49 m
The volume of the reservoir is V such that,
[tex]V=A\times d[/tex]
[tex]V=3\times 10^7\ m^2\times 49\ m[/tex]
[tex]V=1.47\times 10^9\ m^3[/tex]
We have to find the mass of water is held behind the dam. It can be calculated using the expression for density. We know that density of water, d = 1000 kg/m³
Density, [tex]d=\dfrac{m}{V}[/tex]
[tex]m=d\times V[/tex]
[tex]m=1000\ kg/m^3\times 1.47\times 10^9\ m^3[/tex]
[tex]m=1.47\times 10^{12}\ kg[/tex]
Hence, this is the required solution.
Both 192Ir and 137Cs are used in barchytherapy, the use of radioactive isotopes to treat various cancers.Both are beta emitters.
(a)Explain how this observation is consistent .
(b)How do the the N/Z ratios for these two medical isotopes compare to each other ?How do they compare to their nearest stable isotopes?
A soccer player hits a ball with a velocity of 22 m/s at an angle of 36.9 above the horizontal. Air resistance can be ignored. a. b. c. (3) What are the x and y components of the balls initial velocity? (3) How high does the ball go? (4) How long (time) does it take to get to the maximum height?
A particle leaves the origin with an initial velocity of 4.90 m/s in the x direction, and moves with constant acceleration ax = -1.50 m/s^2 and ay = 3.00 m/s^2. How far does the particle move in the x direction before turning around?
Answer:
it will move by d = 8.00 m in x direction before it will turn back
Explanation:
Here the initial velocity of particle is along +x direction
it is given as
[tex]v_i = 4.90 m/s[/tex]
now its acceleration is given as
[tex]a_x = -1.50 m/s^2[/tex]
[tex]a_y = 3.00 m/s^2[/tex]
now when it turns back then the velocity in x direction will become zero
so we will say
[tex]v_f^2 - v_i^2 = 2 a d[/tex]
[tex]0 - 4.90^2 = 2(-1.50) d[/tex]
[tex] d = 8.00 m[/tex]
so it will move by d = 8.00 m in x direction before it will turn back
Final answer:
The particle moves 8.01 m in the x direction before it turns around, determined by using kinematic equations with the given initial velocity and constant acceleration.
Explanation:
To determine how far the particle moves in the x direction before turning around, we need to find the point at which its velocity in the x direction is zero. Since the particle starts with an initial velocity of 4.90 m/s in the x direction and has a constant acceleration of ax = -1.50 m/s², we can use the kinematic equation v = u + at to find the time when the velocity becomes zero:
v = 0 m/s (the velocity at the turnaround point)
u = 4.90 m/s (initial velocity)
a = -1.50 m/s² (constant acceleration)
Solving for the time (t) gives:
0 = 4.90 + (-1.50)t
t = 4.90 / 1.50
t = 3.27 s
Now using the equation s = ut + (1/2)at² to find the displacement in the x direction:
s = 4.90 m/s ⋅ t + (1/2)(-1.50 m/s²) ⋅ t²
s = 4.90 ⋅ 3.27 + (0.5) ⋅ (-1.50) ⋅ (3.27)²
s = 8.01 m
The particle moves 8.01 m in the x direction before turning around.
Question Part Points Submissions Used The difference in potential between the accelerating plates of a TV set is about 218 V. If the distance between these plates is 1.29 cm, find the magnitude of the uniform electric field (N/C) in this region. Consider entering your answer using scientific notation.
Answer:
[tex]1.69\cdot 10^4 N/C[/tex]
Explanation:
The relationship between electric field strength and potential difference is:
[tex]E=\frac{V}{d}[/tex]
where
E is the electric field strength
V is the potential difference
d is the distance between the plates
Here we have
V = 218 V
d = 1.29 cm = 0.0129 m
So, the electric field is
[tex]E=\frac{218 V}{0.0129 m}=16900 N/C = 1.69\cdot 10^4 N/C[/tex]
Two cars of unequal mass moving at the same speed collide head-on. Explain why a passenger in the smaller mass car is more likely to be injured than one in the the larger mass car.
Try this option (shortly):
According to the 'law of consevation of pulse' the passenger in the smaller car receives greater energy then the one in the larger car.
Almost all the received energy is spent to injure the passenger in the smaller car. :(
Final answer:
Passengers in a smaller mass car are at greater risk in a head-on collision due to higher acceleration and force resulting from the collision. Cars with similar masses experience a more even distribution of momentum changes, potentially reducing impact severity. The duration of impact also affects the decelerating force felt by occupants, illustrating the importance of seatbelts and crumple zones.
Explanation:
A passenger in the smaller mass car is more likely to be injured in a head-on collision with a larger mass car because the smaller car will experience a larger acceleration due to the force of impact, according to Newton's second law (force equals mass times acceleration). This greater acceleration translates to a stronger force exerted on the occupants of the smaller car. Additionally, according to the principle of conservation of momentum, if both cars are moving at the same speed and collide, the car with less mass will undergo a more significant change in velocity.
When cars with more similar masses collide, the change in momentum is distributed more evenly between the two, potentially reducing the severity of the impact on both vehicles. This is due to the momentum of the two-car system remaining constant if external forces are negligible (as stated by the law of conservation of momentum). The impulse, or change in momentum, is also important to consider. If cars crumple together instead of rebounding, there's a smaller change in momentum, leading to a smaller force on the occupants, which is why crumple zones are critical safety features in cars.
The scenario with a seatbelt demonstrates the importance of the time over which a force acts. A seatbelt helps extend the time of a collision's impact, reducing the average decelerating force experienced by the occupant, compared to a sudden stop against the dashboard.
An automobile of mass 2000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10000 N. How far does the car travel before stopping?
Answer:
The car traveled the distance before stopping is 90 m.
Explanation:
Given that,
Mass of automobile = 2000 kg
speed = 30 m/s
Braking force = 10000 N
For, The acceleration is
Using newton's formula
[tex]F = ma[/tex]
Where, f = force
m= mass
a = acceleration
Put the value of F and m into the formula
[tex]-10000 =2000\times a[/tex]
Negative sing shows the braking force.
It shows the direction of force is opposite of the motion.
[tex]a = -\dfrac{10000}{2000}[/tex]
[tex]a=-5\ m/s^2[/tex]
For the distance,
Using third equation of motion
[tex]v^2-u^2=2as[/tex]
Where, v= final velocity
u = initial velocity
a = acceleration
s = stopping distance of car
Put the value in the equation
[tex]0-30^2=2\times(-5)\times s[/tex]
[tex]s = 90\ m[/tex]
Hence, The car traveled the distance before stopping is 90 m.
A 66.2 kg ice skater moving to the right with a velocity of 2.47 m/s throws a 0.136 kg snowball to the right with a velocity of 31.4 m/s relative to the ground. What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and the ice.
Answer:
v = 2.41 m/s
Explanation:
Here net force on the Skater + snowball is zero
so here we can use momentum conservation for skater + snowball
[tex]m_1v_{1i} + m_2v_{2i} = m_1v_{1f} + m_2v_{2f}[/tex]
now we have
[tex]66.2(2.47) + (0.136)(2.47) = 66.2 (v) + 0.136(31.4)[/tex]
[tex]163.85 = 66.2 v + 4.27[/tex]
[tex]163.85 - 4.27 = 66.2 v[/tex]
[tex]v = \frac{159.6}{66.2}[/tex]
[tex]v = 2.41 m/s[/tex]
so the final speed of skater will be 2.41 m/s
Two resistors have resistances R1 and R2. When the resistors are connected in series to a 12.7-V battery, the current from the battery is 1.81 A. When the resistors are connected in parallel to the battery, the total current from the battery is 9.06 A. Determine R1 and R2. (Enter your answers from smallest to largest.)
In the case of resistors in series and in parallel to a battery, the resistances can be determined by applying Ohm's law and using equations for total resistance in both series and parallel configurations. The calculations yield the values R1 = 1.53 ohms and R2 = 5.48 ohms.
Explanation:
The problem involves applying Ohm's law and equations for series and parallel resistors. When the resistors are in series, we add the resistances so R1 + R2 = 12.7 V / 1.81 A = 7.01 ohms. In a parallel connection, the total resistance R is given by 1/R = 1/R1 + 1/R2 or 12.7 V / 9.06 A = 1.40 ohms. Solving this pair of equations we get R1 = 1.53 ohms and R2 = 5.48 ohms, giving the pair of resistances asked for.
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A golfer on a level fairway hits a ball at an angle of 21° to the horizontal that travels 99 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 99 yd. At what angle was the second ball hit? (Neglect air resistance.)
Answer:
69°
Explanation:
Projectiles that land at the same elevation they're launched from will have the same range if the launch angles are complementary (add up to 90°).
The complement of 21° is 69°.
The second ball hit at a 69° angle.
Why did the second ball hit at a different angle?Projectiles that land at the same elevation they're launched from will have the same range if the launch angles are complementary (add up to 90°).The complement of 21° is 69°.Because at the time of landing, the magnitude of horizontal and vertical components of the velocity is the same as that at the time of release (although the direction of the vertical component is now downwards, as opposed to being upwards during the release).Now, the angle of the projectile at any point of time during the flight is defined by Theta = tan inverse (Vertical component of velocity/Horizontal component of velocity).Hence, the second ball hit at a 69° angle.To know more information about complementary angles, refer to: https://brainly.com/question/16520123
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A boxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. The moving boxcar collides and links with the stationary cars and they all move off together along the track. What is the final speed of the cars immediately after the collision? (You may take the mass of each boxcar to be 18,537 kg.)
Answer:
2 m/s
Explanation:
Momentum is conserved:
mv = MV
where m is mass of the boxcar, v is its initial velocity, M is the mass of all six box cars, and V is the final velocity.
v = 12 m/s, and M = 6m, so:
m (12 m/s) = 6m V
12 m/s = 6V
V = 2 m/s
The minimum distance required to stop a car moving at 35.6 mi/h is 40.8 ft. What is the minimum stopping distance, in ft, for the same car moving at 71.5 mi/h, assuming the same rate of acceleration? (60.0 mi/h = 88.0 ft/s).
Answer:
Minimum stopping distance = 164.69 ft
Explanation:
Speed of car = 35.6 mi/hr = 15.82 m/s
Stopping distance = 40.8 ft = 12.44 m
We have equation of motion
v² = u² + 2as
0²=15.82²+ 2 x a x 12.44
a = -10.06 m/s²
Now wee need to find minimum stopping distance, in ft, for the same car moving at 71.5 mi/h.
Speed of car = 71.5 mi/h = 31.78 m/s
We have
v² = u² + 2as
0² = 31.78² - 2 x 10.06 x s
s = 50.2 m = 164.69 ft
Minimum stopping distance = 164.69 ft
A 40000-Mg ocean liner has an initial velocity of 4 km/h. Neglecting the frictional resistance of the water, determine the time required to bring the liner to rest by using a single tugboat which exerts a constant force of 225 kN. (Round the final answer to the nearest whole number.)
Answer:
197.2 s
Explanation:
First of all, let's convert the mass of the ocean liner into kilograms:
[tex]m=40,000 Mg = 40,000,000 kg = 4\cdot 10^7 kg[/tex]
and the initial velocity into m/s:
[tex]u=4 km/h =1.11 m/s[/tex]
The force applied is
[tex]F=-225 kN = -2.25\cdot 10^5 N[/tex]
So we can find first the deceleration of the liner:
[tex]a=\frac{F}{m}=\frac{-2.25\cdot 10^5 N}{4\cdot 10^7 kg}=-5.63\cdot 10^{-3} m/s^2[/tex]
And now we can use the following equation:
[tex]a=\frac{v-u}{t}[/tex]
with v = 0 being the final velocity, to find t, the time it takes to bring the liner to rest:
[tex]t=\frac{v-u}{a}=\frac{0-1.11 m/s}{-5.63\cdot 10^{-3} m/s^2}=197.2 s[/tex]
A person walks first at a constant speed of 4.89 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.95 m/s. What is the average speed over the entire trip?
Answer:
approximately 3.68
Explanation:
Explained in the attached picture.
When a 100-Ω resistor is connected across the terminals of a battery of emf ε and internal resistance r, the battery delivers 0.794 W of power to the 100-Ω resistor. When the 100-Ω resistor is replaced by a 200-Ω resistor, the battery delivers 0.401 W of power to the 200-Ω resistor. What are the emf and internal resistance of the battery?
Answer:
The emf and internal resistance of the battery are 9 volt and 2.04 Ω
Explanation:
Given that,
First resistor[tex]R = 100\ \Omega[/tex]
Power[tex]P = 0.794\ W[/tex]
Second resistor[tex]R=200\ \Omega[/tex]
Power[tex]P=0.401\ W[/tex]
We need to calculate the emf and internal resistance
Using formula of emf
[tex]P=\dfrac{e^2}{R+r}[/tex]
For first resistor
[tex]0.794=\dfrac{e^2}{100+r}[/tex]....(I)
For second resistor
[tex]0.401=\dfrac{e^2}{200+r}[/tex].....(II)
From equation (I) and (II)
[tex]\dfrac{795}{401}=\dfrac{200+r}{100+r}[/tex]
Using component of dividend rule
[tex]\dfrac{393}{401}=\dfrac{100}{100+r}[/tex]
[tex]r =2.04\ \Omega[/tex]
Now, Put the value of internal resistance in equation (I)
[tex]0.794=\dfrac{e^2}{100+2.04}[/tex]
[tex]e^2=0.794(100+2.04)[/tex]
[tex]e=\sqrt{0.794(100+2.04)}[/tex]
[tex]e=9\ volt[/tex]
Hence, The emf and internal resistance of the battery are 9 volt and 2.04 Ω
The emf and internal resistance of a battery can be calculated using Ohm's Law (V=IR) and the power formula (P = I²R). By evaluating the current and emf for two different resistors, we can arrive at two equations that, when solved simultaneously, give the emf and internal resistance.
Explanation:The question is asking for the calculation of the EMF (electromotive force) and internal resistance of the battery. First, we need to understand the relationship between power, voltage, current, and resistance, which is described by Ohm's Law and the power formulas. For the 100 Ω resistor, we can use the formula for power P = I²R to find the current, which comes out to be √P/R = √0.794/100 = 0.0281 A. Then, we can use Ohm's Law V = I(R+r) to find the voltage of the battery (emf), plugging in the values we get V = 0.0281(100+r).
When the resistor is changed to 200 Ω, we repeat the process, giving us the equation V = 0.0281(200+r). Solving these two equations will give us the EMF and internal resistance of the battery.
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The distance between two successive minima of a transverse wave is 3.10 m. Five crests of the wave pass a given point along the direction of travel every 14.7 s. (a) Find the frequency of the wave. Hz (b) Find the wave speed. m/s
Answer:
The frequency is 0.34 Hz and the wave speed is 1.05 m/s.
Explanation:
Given that,
The distance between two successive minima of a transverse wave is wavelength.
Wavelength = 3.10 m
Time = 14.7 s
(I). We need to calculate the frequency
[tex]f=\dfrac{number\ of\ wave\ propagated\ per\ second }{times}[/tex]
[tex]f=\dfrac{5}{14.7}[/tex]
[tex]f=0.34\ Hz[/tex]
(II). We need to calculate the wave speed
Formula of wave speed
[tex]v= \lambda\times f[/tex]
Where,
[tex]\lambda = wavelength[/tex]
[tex]f = frequency[/tex]
Put the value into the formula
[tex]v=3.10\times0.34[/tex]
[tex]v=1.05\ m/s[/tex]
Hence, The frequency is 0.34 Hz and the wave speed is 1.05 m/s.
The frequency of the wave is 0.34 Hz and the wave speed is 1.054 m/s.
Explanation:The distance between two successive minima in a transverse wave is the same as the wavelength (λ). Given that the question provided this distance as 3.10 m, we can use this as the wavelength. On the other hand, the frequency (f) of the wave is the number of wave cycles that pass a point per unit time. The information from the question gives us five crests (complete cycles) over 14.7 seconds. Thus, we can calculate the frequency by dividing the total cycles by the total time, i.e., f = 5 cycles / 14.7 seconds = 0.34 Hz.
The speed of the wave (v) can be obtained from the equation v = λf. Substituting the values we have, v = (3.10 m) * (0.34 Hz) = 1.054 m/s. Therefore, the frequency of the wave is 0.34 Hz, and the wave speed is 1.054 m/s.
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A soft drink manufacturer claims that a new diet drink is "low Joule." The label indicates the available energy per serving is 6300 J. What is the equivalent of this energy in Calories (1 Calorie = 1000 cal)?
Answer:
6300 J = 1.51 Calories
Explanation:
We have 1 Calorie = 1000 cal
1 cal = 4.184 J
That is 1 Calorie = 1000 cal = 1000 x 4.184 = 4184 J
Here we have 6300 J
That is
[tex]1Calorie=4184J\\\\1J=\frac{1}{4184}Calorie\\\\6300J=\frac{6300}{4184}Calorie=1.51Calorie[/tex]
6300 J = 1.51 Calories