The resulting current density in the section of silver of uniform cross section be 1.54 × 10^11 A/m^ 2.
What is resistivity?Electrical resistivity is a measurement of a material's degree of resistance to current flow. The SI unit for electrical resistivity is the ohm metre (m). It is frequently represented by the Greek letter rho.
Materials that easily transmit current and have a low resistance are called conductors. Insulators have a high resistance and do not conduct electricity. Resistivity is defined as the size of the electric field across it that results in a particular current density.
Resistivity at any temperature T is given by: ρ = ρ₀[1 + α(T-T₀)]
Given:
ρ₀ = 1.59x10^-8 ohms*m
reference temperature (T₀) = 20°C.
T = 3°C and α = 0.0038/°C.
So, resistivity ρ = 1.59x10^-8[ 1 + 0.0038×( 3 -20)] ohm.m
= 7.39 × 10^-9 ohm.m.
Again: electric field : E = 1139 V/m
So, resulting current density = E/ρ = 1139/ 7.39 × 10^-9 A/m^2
=1.54 × 10^11 A/m^ 2.
Hence, The resulting current density in the section of silver of uniform cross section be 1.54 × 10^11 A/m^ 2.
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To determine the current density in the silver specimen at 3 C, you must calculate its resistivity at that temperature using the temperature coefficient. Then, find the conductivity and use Ohm's law with the given electric field to calculate the current density.
To find the resulting current density (J), we need to first adjust the resistivity ( ) of silver for the given temperature of 3 C. The resistivity at this temperature can be found using the formula (T) = 0[1 + ( T - 20 C)], where (T) is the resistivity at temperature T, 0 is the resistivity at 20 C, and is the temperature coefficient of the material.
Substituting the given values into the formula, we get: (3 C) = 1.59 10^-8 [ 1 + 0.0038( 3 C - 20 C) ] = 1.59 ₓ 10⁻⁸ [ 1-0.0646] = 1.59 ₓ 10⁻⁸ (0.9354 m) = 1.49 ₓ 10⁻⁸ .
Now that we have the resistivity at 3 C, we can find the conductivity ( s) using s = 1/ which equals 1/(1.49 ₓ 10⁻⁸ ) = 6.71 ₓ 10⁷ S/m.
The current density J can then be calculated using Ohm's law, J = sE, where E is the electric field intensity. Using the provided electric field of 1139 V/m, J = 6.71 ₓ10⁷ S/m 1139 V/m = 7.64ₓ 10¹⁰ A/m.
An elbow has a loss coefficient K of 0.4. Considering a pipe with friction factor of 0.025 and diameter of 20 mm, what is the equivalent length (Le) for the elbow in mm?
Answer:
320 mm
Explanation:
The equivalent length for a minor loss is:
Le = K D / f
where K is the loss coefficient, D is the diameter, and f is the friction factor.
Le = (0.4) (20 mm) / 0.025
Le = 320 mm
The equivalent length (Le) for the elbow with a loss coefficient (K) of 0.4, a pipe with a friction factor of 0.025, and a diameter of 20 mm, is 320 mm.
To calculate the equivalent length (Le) for the elbow in terms of pipe diameter, we use the relationship between the loss coefficient (K), the friction factor (f), and the diameter (D) of the pipe, given by the equation Le = (K * D) / f. In this case, the loss coefficient for the elbow is 0.4, the friction factor is 0.025, and the diameter of the pipe is 20 mm. Plugging these values into the equation, we get:
Le = (0.4 * 20 mm) / 0.025 = 320 mm.
Therefore, the equivalent length for the elbow is 320 mm.
A long-distance swimmer is able to swim through still water at 4.0 km/h. She wishes to try to swim from Port Angeles, Washington, directly north to Victoria, British Columbia, a distance of 50 km. An ocean current flows through the Strait of Juan de Fuca from west to east at 3.0 km/h. In what direction (relative to north) should she swim to make the crossing along a straight line between the two cities?
Let [tex]\theta[/tex] be the direction the swimmer must swim relative to east. Then her velocity relative to the water is
[tex]\vec v_{S/W}=\left(4.0\dfrac{\rm km}{\rm h}\right)(\cos\theta\,\vec\imath+\sin\theta\,\vec\jmath)[/tex]
The current has velocity vector (relative to the Earth)
[tex]\vec v_{W/E}=\left(3.0\dfrac{\rm km}{\rm h}\right)\,\vec\imath[/tex]
The swimmer's resultant velocity (her velocity relative to the Earth) is then
[tex]\vec v_{S/E}=\vec v_{S/W}+\vec v_{W/E}[/tex]
[tex]\vec v_{S/E}=\left(\left(4.0\dfrac{\rm km}{\rm h}\right)\cos\theta+3.0\dfrac{\rm km}{\rm h}\right)\,\vec\imath+\left(4.0\dfrac{\rm km}{\rm h}\right)\sin\theta\,\vec\jmath[/tex]
We want the resultant vector to be pointing straight north, which means its horizontal component must be 0:
[tex]\left(4.0\dfrac{\rm km}{\rm h}\right)\cos\theta+3.0\dfrac{\rm km}{\rm h}=0\implies\cos\theta=-\dfrac{3.0}{4.0}\implies\theta\approx138.59^\circ[/tex]
which is approximately 41º west of north.
The swimmer should swim approximately 36.87 degrees in the north-west direction to counteract the eastward ocean current and reach Victoria, British Columbia directly from Port Angeles, Washington. This is derived by considering the velocity vectors of the swimmer and the current.
Explanation:This question is about the interaction of velocity vectors which is a concept from physics. The swimmer's speed and the ocean current each represent a vector with both a magnitude (speed) and direction. We must factor in these two vectors to work out where the swimmer should aim to swim.
Assuming the north direction as +y axis and east as +x axis, the swimmer intends to swim north with velocity 4.0 km/h and the water's current is moving towards east with velocity 3.0 km/h. In order for the swimmer to move directly north, the swimmer needs to swim against the current, which means westwards. By utilizing the Pythagorean Theorem and trigonometric principles, we can calculate the angle of her direction which is arctan(3/4) in the north-west direction or around 36.87 degrees from north.
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An automobile engine has an efficiency of 19.0%. If it produces 23.0 kJ of mechanical work per second, the heat rejected per second from the engine is closest to: (a) 77.0 kJ (b) 81.5 kJ (c)86.5 kJ (d) 92.0 kJ (e) 98.1 kJ
Answer:
(e) 98,1 KJ
Explanation:
The engine produces 19%; it means, it rejects 81% of energy. ⇒ 81/19=4.26 times.
The engine produces 23 kJ; it means it rejects 23 * 4.26 = 98.05263 kJ
A tank holds a 1.44-m thick layer of oil that floats on a 0.98-m thick layer of brine. Both liquids are clear and do not intermix. Point O is at the bottom of the tank, on a vertical axis. The indices of refraction of the oil and the brine are 1.40 and 1.52, respectively. A ray originating at O crosses the brine-oil interface at a point 0.7 m from the axis. The ray continues and emerges into the air above the oil. What is the angle that the ray in the air makes with the vertical axis
Answer:
Angle of ray makes with the vertical is 62.1 degree
Explanation:
As per the ray diagram we know that the angle of incidence on oil brine interface will be given as
[tex]tan\theta_i = \frac{0.7}{0.98}[/tex]
[tex]\theta_i = 35.5^0[/tex]
now by Snell'a law at that interface we have
[tex]\mu_1 sin\theta_i = \mu_2 sin \theta_r[/tex]
now we will have
[tex]1.52 sin35.5 = 1.40 sin\theta_r[/tex]
[tex]\theta_r = 39.12^0[/tex]
now this is the angle of incidence for oil air interface
so now again by Snell's law we will have
[tex]\mu_2 sin\theta_i' = \mu_{air} sin\theta[/tex]
[tex]1.40 sin39.12 = 1 sin\theta[/tex]
[tex]\theta = 62.1^0[/tex]
The problem involves applying Snell's law twice, once for the brine-to-oil interface and then for the oil-to-air interface, with angles calculated from the normal lines. Severally, the use of the Pythagorean theorem gives the angle in brine, Snell's law then gives the angle in oil, and finally in the air. The desired angle is found as an augmentation to 90 degrees since it should be calculated from the axis, not the normal line.
Explanation:Firstly we need to calculate the angle that the ray makes with the norm or perpendicular line to the brine-oil interface. This can be done using the Pythagorean theorem, given that we have the height of the brine (0.98m), and the horizontal distance from the axis to the point of intersection (0.7m). The angle is then the arcsin of the opposite side (0.7m) over the hypotenuse (√[(0.7m)2+(0.98m)2]) in radians. (Remember that inverse sin is used to calculate angles). Let's call this angle θ1.
Using Snell's law (n1sinθ1 = n2sinθ2), where the indices of refraction n1 and n2 are for brine (1.52) and oil (1.40) respectively, we can figure out θ2, the angle that the ray makes with the normal in the oil part. The key detail is that angles are always measured from the normal line, which is perpendicular to the interfaces.
Finally, similar calculations will grant what is to be found - the angle the ray makes with the vertical axis in the air (with the index of refraction n=1). This is θ3 calculated from the equation n2sinθ2 = n3sinθ3, where θ2 is the angle that we just found and n2 is the index of refraction for oil. You need to remember that Snell's law applies for any two mediums with a clear border in between through which the light passes.
Finally, the desired angle between the ray's line in the air and the vertical axis will be 90° - θ3 (since θ3 was an angle with the normal line, which is defined as perpendicular to the axis).
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A(n) 1100 kg car is parked on a 4◦ incline. The acceleration of gravity is 9.8 m/s 2 . Find the force of friction keeping the car from sliding down the incline.
Answer:
Force of friction, f = 751.97 N
Explanation:
it is given that,
Mass of the car, m = 1100 kg
It is parked on a 4° incline. We need to find the force of friction keeping the car from sliding down the incline.
From the attached figure, it is clear that the normal and its weight is acting on the car. f is the force of friction such that it balances the x component of its weight i.e.
[tex]f=mg\ sin\theta[/tex]
[tex]f=1100\ kg\times 9.8\ m/s^2\ sin(4)[/tex]
f = 751.97 N
So, the force of friction on the car is 751.97 N. Hence, this is the required solution.
In essence, the force of friction that prevents the car from sliding down the incline is equal to the component of the weight of the car down the incline. After performing the necessary calculations, this is found to be roughly 766.9 Newtons.
Explanation:In response to your question, the force of friction keeping the car from sliding down the incline can be calculated using basic physics principles. Firstly, we need to calculate the component of the gravitational force parallel to the incline, which is given by F_gravity = m * g * sin(theta), where m is the mass of the car, g is the acceleration due to gravity, and theta is the angle of incline.
Substituting the given values, we get F_gravity = 1100 kg * 9.8 m/s² * sin(4°), which approximates to 766.9 N.
Now, since the car is stationary and not sliding down, this suggests that the force of friction equals the component of the weight down the incline. Therefore, the force of friction keeping the car from sliding down is approximately 766.9 Newtons.
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Sexual harassment is a form of sex discrimination and is against the law.
True
False
Answer:
True.
Explanation:
This statament is true.
The emf of a battery is equal to its terminal potential difference A) under all conditions B) only when the battery is being charged C) only when a large current is in the battery D) only when there is no current in the battery E) under no conditions
D. The chemical potential energy of real battery decreases, it develops internal resistance and therefore the potential difference across its terminals decreases if its current increases.
A 7.5-N net force is applied to a 47-kg object. What is the object's acceleration?
Answer:
Object's acceleration, a = 0.15 m/s²
Explanation:
It is given that,
Net force acting on the object, F = 7.5 N
Mass of an object, m = 47 kg
We need to find the acceleration of the object. It can be calculated using second law of motion as :
F = ma
a = acceleration of the object
[tex]a=\dfrac{F}{m}[/tex]
[tex]a=\dfrac{7.5\ N}{47\ kg}[/tex]
[tex]a=0.15\ m/s^2[/tex]
So, the acceleration of the object is 0.15 m/s². Hence, this is the required solution.
A parallel-plate capacitor has a plate area of 0.3 m2 and a plate separation of 0.1 mm. If the charge on each plate has a magnitude of 5 × 10–6 C then the force exerted by one plate on the other has a magnitude of about:
Answer:
4.72 N
Explanation:
The charge density across each plate is given by:
[tex]\sigma = \frac{Q}{A}[/tex]
where
[tex]Q=5\cdot 10^{-6}C[/tex] is the charge on each plate
[tex]A=0.3 m^2[/tex] is the area of each plate
Solving,
[tex]sigma = \frac{5\cdot 10^{-6}C}{0.3 m^2}=1.67\cdot 10^{-5} C/m^2[/tex]
The force exerted by one plate on the other is given by:
[tex]F=\frac{Q\sigma}{2\epsilon_0}[/tex]
where
[tex]Q=5\cdot 10^{-6}C[/tex] is the charge on each plate
[tex]\sigma=1.67\cdot 10^{-5} C/m^2[/tex] is the surface charge density
[tex]\epsilon_0[/tex] is the vacuum permittivity
Substituting,
[tex]F=\frac{(5\cdot 10^{-6} C)(1.67\cdot 10^{-5} C/m^2)}{2(8.85\cdot 10^{-12}F/m)}=4.72 N[/tex]
We can find the force exerted by one plate of a parallel-plate capacitor on the other by utilizing the known quantities and the formula F = Q² / (A * ε), which arises from force definition and electric field for a parallel-plate capacitor.
Explanation:The magnitude of the force between two charges is given by Coulomb's law: F = k * (Q1 * Q2) / d², where k is the Coulomb's constant, Q1 and Q2 are the charges, and d is the distance. The electric field for a parallel-plate capacitor is E = Q / (A * ε), where ε is the permittivity of free space.
The force exerted on each plate of the capacitor is F = QE which, once substituted, becomes F = Q² / (A * ε) when charge, plate area, and permittivity are known. Given the values of the problem, by substituting into the equation, you can calculate the force between the plates.
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For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? A)The horizontal and vertical components of its velocity are zero. B) Its velocity is perpendicular to the acceleration. C)The horizontal component of its velocity is zero. D)Its velocity and acceleration are both zero.
Answer:
B) Its velocity is perpendicular to the acceleration.
Explanation:
For general projectile motion, the horizontal acceleration is 0 and the vertical acceleration is -g. This is true for all points on the trajectory.
At the highest point, the vertical velocity is 0. So you have only a horizontal velocity as well as a vertical acceleration. So the two are perpendicular.
A high voltage transmission line with a resistance of 0.51 Ω/km carries a current of 1099 A. The line is at a potential of 1300 kV at the power station and carries the current to a city located 156 km from the power station. What is the power loss due to resistance in the line? Answer in units of MW
[tex]\boxed{P=96.09MW}[/tex]
Explanation:First of all, we need to figure out what is the resistance in that line. In this problem, the total resistance is not given directly, but we can calculate it because we know it in terms of 0.51 Ω/km and since the distance from the power station to the city is 156km, then:
[tex]R_{line}=0.51 \frac{\Omega}{km}.156km \\ \\ R_{line}=79.56\Omega[/tex]
So we can calculate the power loss as:
[tex]P=I^2R \\ \\ Where: \\ \\I=1099A \\ \\ P=(1099)^2(79.56) \\ \\ P=96092647.56W \\ \\ Remember \ that \ 1MW=10^6W \ So: \\ \\ P=96092647.56W(\frac{1M}{10^6}) \\ \\ \boxed{P=96.09MW}[/tex]
Finally, the power loss due to resistance in the line is 96.09MW
Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this objectʹs acceleration? A) 1.1 m/s2 B) 1.3 m/s2 C) 1.5 m/s2
Answer:
A) 1.1 m/s/s
Explanation:
There exist two forces on the object such that
[tex]F_1[/tex] = 65 N directed 59° clockwise from the positive x-axis
[tex]F_2[/tex] = 35 N at 32° clockwise from the positive y-axis
now we have
[tex]F_1 = 65 cos59\hat i - 65 sin59 \hat j[/tex]
[tex]F_2 = 35 sin32\hat i + 35 cos32 \hat j[/tex]
now the net force on the object is given as
[tex]F_{net} = F_1 + F_2[/tex]
[tex]F_{net} = (65 cos59 + 35 sin32)\hat i + (35cos32 - 65 sin59)\hat j[/tex]
[tex]F_{net} = 52\hat i - 26 \hat j[/tex]
so it's magnitude is given as
[tex]F_{net} = \sqrt{52^2 + 26^2} = 58.15 N[/tex]
now from Newton's II law we have
F = ma
[tex]a = \frac{58.15}{55} = 1.1 m/s^2[/tex]
To find the magnitude of the object's acceleration, resolve the forces into components and use Newton's second law and the Pythagorean theorem.
Explanation:To find the magnitude of the object's acceleration, we need to first resolve the two forces into their x and y components. For the 65 N force, the x-component is 65 N × cos(59°) and the y-component is 65 N × sin(59°). For the 35 N force, the x-component is 35 N × sin(32°) and the y-component is 35 N × cos(32°).
Next, we add the x-components and the y-components separately to get the net force in the x and y directions. Then we use Newton's second law, F = ma, to find the acceleration in each direction. Finally, we use the Pythagorean theorem to find the magnitude of the acceleration.
By following these steps, we can calculate that the magnitude of the object's acceleration is 1.5 m/s², so the correct answer is C) 1.5 m/s².
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A 26 tooth helical gear having a pitch diameter of 7 has a helix angle of 22 deg. Find the circular pitch in a plane normal to the teeth.
Answer:
the answer is that u need to divide the 26 by the 22 and then u add seven to that number and then u have to multiply by 2. And you will get your answer
Explanation:
A reaction taking place in a container with a piston-cylinder assembly at constant temperature produces a gas, and the volume increases from 127 mL to 654 mL against an external pressure of 860 torr. Calculate the work done in Joules (J)
Answer:
60.4 J
Explanation:
The work done by the gas is given by:
[tex]W=p(V_f-V_i)[/tex]
where
p is the gas pressure
[tex]V_f[/tex] is the final volume of the gas
[tex]V_i[/tex] is the initial volume
We must convert all the quantities into SI units:
[tex]p=860 torr \cdot \frac{1.013\cdot 10^5 pa}{760 torr}=1.146\cdot 10^5 Pa[/tex]
[tex]V_i = 127 mL = 0.127 L = 0.127 dm^3 = 0.127 \cdot 10^{-3}m^2[/tex]
[tex]V_f = 654 mL = 0.654 L = 0.654 dm^3 = 0.654 \cdot 10^{-3}m^2[/tex]
So the work done is
[tex]W=(1.146\cdot 10^5 Pa)(0.654\cdot 10^{-3} m^3-0.127\cdot 10^{-3} m^3)=60.4 J[/tex]
Answer:
[tex]W=60.4 J[/tex]
Work done is 60.4 Joules (J)
Explanation:
Work done 'W' is given by:
[tex]W=P\triangle V[/tex]
Where:
ΔV is the change in Volume.
P is the pressure.
Change in Volume=Final Volume-Initial Volume
Initial Volume= 127 mL
Final Volume= 654 mL
ΔV=654-127 (mL)
ΔV=527 mL
ΔV=0.527 L
Pressure Conversion:
1 atm=760 torr
[tex]P=\frac{860}{760} \\P=1.1315\ atm[/tex]
Now,
[tex]W=P\triangle V[/tex]
[tex]W=1.1315\ atm*0.527\ L[/tex]
[tex]W=0.5963 L.atm[/tex]
In joule (J): (Conversion 1 atm. L=101.325 J)
[tex]W=0.5963\ L.atm*\frac{101.325 J}{1\ L.atm}[/tex]
[tex]W=60.4 J[/tex]
Work done is 60.4 Joules (J)
A 4350 kg truck, driving 7.39 m/s, runs into the back of a stationary car. After the collision, the truck moves 4.55 m/s and the car moves 11.5 m/s, both in the same direction. What is the mass of the car?
Answer:
Mass of car = 1098 kg
Explanation:
Here law of conservation of momentum is applied.
Let mass of car be m.
Initial momentum = Final momentum.
Initial momentum = 4350 x 7.39 + m x 0 = 32416.5 kgm/s
Final momentum = 4350 x 4.55 + m x 11.5 = 19792.5+11.5m
We have
19792.5+11.5m = 32416.5
m = 1097.97 kg
Mass of car = 1098 kg
Answer:1074.26
Explanation:just got it right on my accelus
As mentioned before, our asteroid is in the shape of a sphere and has a mass of 1000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 1.2 meters. Useful information: 1 kg = 1000 g, 1 m = 100 cm, volume of sphere = 4/3 ? r3. Remember that the radius of a sphere is equal to half its diameter. Show all of your work. (20 points)
Answer: [tex]1.1052g/cm^{3}[/tex]
Explanation:
Density [tex]D[/tex] is a characteristic property of a material and is defined as the relationship between the mass [tex]m[/tex] and volume [tex]V[/tex] of a specific substance or material. So, the density of the asteroid is given by the following equation:
[tex]D=\frac{m}{V}[/tex] (1)
On the other hand, we know the asteroid has a mass [tex]m=1000kg[/tex] and is spherical. This means its volume is given by the following formula:
[tex]V=\frac{4}{3}}\pi r^{3}[/tex] (2)
Where [tex]r=\frac{d}{2}=\frac{1.2m}{2}=0.6m[/tex] is the radius of the sphere and is half its diameter [tex]d[/tex].
Knowing this, we can calculate the volume:
[tex]V=\frac{4}{3}}\pi (0.6m)^{3}[/tex] (3)
[tex]V=0.904m^{3}[/tex] (4)
Substituting (4) in (1):
[tex]D=\frac{1000kg}{0.904m^{3}}=1105.242\frac{kg}{m^{3}}[/tex] (5) This is the density of the asteroid, but we were asked to find it in [tex]\frac{g}{cm^{3}}[/tex]. This means we have to make the conversion:
[tex]D=1105.242\frac{kg}{m^{3}}.\frac{1000g}{1kg}.\frac{1m^{3}}{(100cm)^{3}}[/tex]
Finally:
[tex]D=1.1052\frac{g}{cm^{3}}[/tex]
Two identical circular plates have a diameter of 8.2 cm. They are placed parallel to each other separated by a distance of 2.1 mm. What is the capacitance if paper, with a k-3.7, is placed between the plates? O 92 pF O 82 p O 62 pF ? 13oF
Answer:
82 pF
Explanation:
diameter = 8.2 cm, distance, d = 2.1 mm = 0.0021 m,
dielectric constant, k = 3.7
radius = 1/2 x diameter = 8.2 / 2 = 4.1 cm = 0.041 m
The formula for the capacitance of parallel plate capacitor is given by
[tex]C = \frac{k \varepsilon _{0}\times A}{d}[/tex]
[tex]C = \frac{3.7 \times 8.854\times 10^{-12} \times \pi \times 0.041 \times 0.041}{0.0021}[/tex]
C = 8.23 x 10 ^-11 F
C = 82 pF
Three resistors are connected in series across a 15-V power supply. If the potential drops across resistors 1 and 2 are 4.1 volts and 3.1 volts, what is the exact potential drop (in volts) across resistor 3?
Answer:
7.8 V
Explanation:
When resistors are connected in series, they are connected in the same branch of the circuit. This means that the current flowing each resistor is the same, while the sum of the voltage drops across each resistor is equal to the potential difference of the power supply:
[tex]V= V_1 + V_2 + V_3[/tex]
In this circuit we have:
V = 15 V
[tex]V_1 = 4.1 V[/tex]
[tex]V_2 = 3.1 V[/tex]
So, the voltage drop across resistor 3 is
[tex]V_3 = V-V_1 - V_2 = 15 V - 4.1 V - 3.1 V=7.8 V[/tex]
Final answer:
The exact potential drop across the third resistor, when three resistors are connected in series to a 15-V power supply and the voltage drops across the first two are 4.1V and 3.1V, is 7.8 volts.
Explanation:
The question asks for the exact potential drop across resistor 3 when three resistors are connected in series across a 15-V power supply, and the potential drops across the first two resistors are known. In a series circuit, the total voltage supplied is equal to the sum of individual voltage drops across all components. Given that the voltage drops across resistors 1 and 2 are 4.1 volts and 3.1 volts respectively, the voltage drop across resistor 3 can be calculated by subtracting the sum of the voltage drops across resistors 1 and 2 from the total voltage supplied by the power source.
Therefore, the calculation is:
Total voltage supplied by the power source = 15 volts
Sum of voltage drops across resistor 1 and 2 = 4.1 volts + 3.1 volts = 7.2 volts
Voltage drop across resistor 3 = Total voltage - Sum of voltage drops across resistor 1 and 2 = 15 volts - 7.2 volts = 7.8 volts.
An object is moving east, and it’s velocity changes from 65m/s to 25m/s in 10 seconds. Which describes the acceleration?
Answer:
4 m/s2 in negative acceleration
Explanation:
If An object is moving east, and it’s velocity changes from 65m/s to 25m/s in 10 seconds, it is 4 m/s2 in negative acceleration.
Hope this helps!
Answer:
[tex]-4\frac{m}{s^2}[/tex]
Explanation:
The object changes its speed over some time, this means that there is an acceleration.
It has a uniformly accelerated movement.
The Formula for finding speed in a uniformly accelerated motion is
[tex]a=\frac{V_{f}-V_{o}}{t}[/tex]
[tex]V_{o}= 65\frac{m}{s}\\V_{f}= 25\frac{m}{s} \\t= 10s[/tex]
Replace
[tex]a=\frac{(25-65)\frac{m}{s} }{10 s}\\ a=\frac{-40\frac{m}{s} }{10s}\\a= -4\frac{m}{s^2}[/tex]
Acceleration gives us a negative value this means that it is slowing.
A train slows down as it rounds a sharp horizontal turn, going from 94.0 km/h to 46.0 km/h in the 17.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 46.0 km/h. Assume the train continues to slow down at this time at the same rate.
Answer:
1.41 m/s^2
Explanation:
First of all, let's convert the two speeds from km/h to m/s:
[tex]u = 94.0 km/h \cdot \frac{1000 m/km}{3600 s/h} = 26.1 m/s[/tex]
[tex]v=46.0 km/h \cdot \frac{1000 m/km}{3600 s/h}=12.8 m/s[/tex]
Now we find the centripetal acceleration which is given by
[tex]a_c=\frac{v^2}{r}[/tex]
where
v = 12.8 m/s is the speed
r = 140 m is the radius of the curve
Substituting values, we find
[tex]a_c=\frac{(12.8 m/s)^2}{140 m}=1.17 m/s^2[/tex]
we also have a tangential acceleration, which is given by
[tex]a_t = \frac{v-u}{t}[/tex]
where
t = 17.0 s
Substituting values,
[tex]a_t=\frac{12.8 m/s-26.1 m/s}{17.0 s}=-0.78 m/s^2[/tex]
The two components of the acceleration are perpendicular to each other, so we can find the resultant acceleration by using Pythagorean theorem:
[tex]a=\sqrt{a_c^2+a_t^2}=\sqrt{(1.17 m/s^2)+(-0.78 m/s^2)}=1.41 m/s^2[/tex]
Answer:
a = 1.406 m/s²
Explanation:
We are told that, the speed of the train decreases from 94.0 km/h to 46.0 km/h
Let's convert both to m/s.
Thus,
v1 =94 km/h =(94 x 10)/36 =26.11 m/s
v2=46 km/h =(46 x 10)/36=12.78 m/s
The formula to calculate the tangential acceleration is given by;
a_t = -dv/dt
Where;
dv is change in velocity
dt is time difference
dv is calculated as; dv = v1 - v2
Thus, dv = 26.11 - 12.78 = 13.33 m/s
We are given that, t = 17 seconds
Thus;
a_t = -13.33/17 = -0.784 m/s²
The negative sign implies that the acceleration is inwards.
Now, let's calculate the radial acceleration;
a_r = v²/r
Where;
r is the radius of the path = 140m
v is the velocity at the instant given
a_r is radial acceleration.
Thus,
a_r = 12.78²/140 = 1.167 m/s²
Now, the tangential and radial components of acceleration are perpendicular to each other. Thus, we can use using Pythagoreas theorem to find the resultant acceleration;
Thus;
a² = (a_t)² + (a_r)²
Plugging in the relevant values, we have;
a² = (-0.784)² + (1.167)²
a² = 1.976545
a = √1.976545
a = 1.406 m/s²
a person when asked to speak up,increases her sound level from 30dB to 60dB.The amount of power per unit area increased by? a)3000 times b)30 times c)2 times d)1000 times
Answer:
d) 1000 times
Explanation:
As we know that difference of sound level is given as
[tex]L_2 - L_1 = 10 Log \frac{I_2}{I_1}[/tex]
so here we need to find the ratio of two intensity
it is given as
[tex]Log\frac{I_2}{I_1} = \frac{(L_2- L_1)}{10}[/tex]
[tex]Log\frac{I_2}{I_1} = \frac{60 - 30}{10}[/tex]
[tex]Log\frac{I_2}{I_1} = 3[/tex]
now we have
[tex]\frac{I_2}{I_1} = 10^3[/tex]
so it is
d) 1000 times
A 6 N force and a 15 N force act on an object. The moment arm of the 6 N force is 0.4 m. If the 15 N 20. force provides 5 times the torque of the 6 N force, what is its moment arm?
Answer:
0.8 m
Explanation:
For "6 N" force :
F = magnitude of the force = 6 N
r = moment arm = 0.4 m
Torque due to "6 N" force is given as
τ = r F
τ = (0.4) (6)
τ = 2.4 Nm
For " 15 N" force :
F' = magnitude of the force = 15 N
r' = moment arm = ?
τ' = Torque = 5 τ = 5 x 2.4 = 12 Nm
Torque due to "15 N" force is given as
τ' = r' F'
12 = r' (15)
r' = 0.8 m
So the moment arm for "15 N" force is 0.8 m
A 920 kg cannon fires a 3.5 kg shell at initial acceleration of 95 m/s^2. What is the cannon's recoil force?
Answer:
The cannon recoils with a force of 332.5 N
Explanation:
By Newton's third law Recoil force on cannon = Force in shell.
Force in shell = Mass of shell x Acceleration of shell
Mass of shell = 3.5 kg
Acceleration of shell = 95 m/s²
Force in shell = 3.5 x 95 = 332.5 N
Recoil force on cannon = 332.5 N
So, the cannon recoils with a force of 332.5 N
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest. It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air resistance is negligible, and the collision is elastic. The masses of the ball and block are, respectively, 1.67 kg and 2.59 kg, and the length of the wire is 1.01 m. Find the velocity of the ball just after the collision.
Answer:
0.96 m/s
Explanation:
Consider the motion of the ball before collision with the block
h = height from which the ball is dropped = length of the wire = 1.01 m
m = mass of the ball = 1.67 kg
v = speed of the ball just before collision with the block = ?
Using conservation of energy for the ball
Kinetic energy of the ball at the bottom = Potential energy of the ball at the top
(0.5) m v² = mgh
(0.5) v² = gh
(0.5) v² = (9.8) (1.01)
v = 4.45 m/s
consider the collision between the ball and the block :
m = mass of the ball = 1.67 kg
v = velocity of the ball just before collision with the block = 4.45 m/s
v' = velocity of the ball just after collision with the block
M = mass of the block = 2.59 kg
V = velocity of the block just before collision with the ball = 0 m/s
V' = velocity of the block just after collision with the ball
Using conservation of momentum
mv + MV = mv' + MV'
(1.67) (4.45) + (2.59) (0) = 1.67 v' + (2.59) V'
7.43 = 1.67 v' + (2.59) V'
[tex]V' = \frac{(7.43 - 1.67 v')}{2.59}[/tex] eq-1
Using conservation of kinetic energy
(0.5) mv² + (0.5) MV² = (0.5) mv'² + (0.5) MV'²
mv² + MV² = mv'² + MV'²
(1.67) (4.45)² + (2.59) (0)² = 1.67 v'² + (2.59) V'²
using eq-1
(1.67) (4.45)² = 1.67 v'² + (2.59) ((7.43 - 1.67 v')/2.59)²
v' = - 0.96 m/s
the negative sign indicates the direction which is opposite to its direction before colliding with the block.
To find the velocity of the ball just after the elastic collision, apply the formula for one-dimensional elastic collision. Given that the ball initially fell from a certain height, calculate its initial velocity using the conservation of energy principle. Insert these results, along with the given masses, into the elastic collision formula to achieve the answer.
Explanation:This question explores the principles of conservation of momentum and the properties of an elastic collision. Given that this collision is perfectly elastic, we can use the formula for an elastic collision in one-dimension:
v1' = ((m1 - m2) / (m1 + m2)) * v1 + ((2 * m2) / (m1 + m2)) * v2
where v1' is the velocity of the ball after collision, m1 and m2 are the masses of the ball and the block respectively, v1 and v2 are the velocities of the ball and block before the collision. The ball was initially dropped from a height, so we'd first need to calculate its velocity just before collision using the conservation of energy principle:
v1 = sqrt(2* g * h)
where g is the acceleration due to gravity and h is the height (length of the wire). After figuring out the value of v1, we just need to plug the values into the first equation to find v1' - velocity of the ball after collision.
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One of the fastest recorded pitches in major-league baseball, thrown by Tim Lincecum in 2009, was clocked at 101.0 mi/h. If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 60.5 ft away?
Final answer:
A baseball pitched horizontally at 101.0 mi/h will travel 60.5 feet to home plate in about 0.408 seconds; during that time, it will fall approximately 2.68 feet due to gravity.
Explanation:
To calculate how far a baseball would fall vertically when thrown horizontally at 101.0 mi/h, we can divide the problem into two separate motions - horizontal and vertical. Since the vertical and horizontal motions are independent, we can analyze them separately. First, we need to convert the speed to feet per second (1 mi/h = 1.467 ft/s), multiply 101.0 mi/h by 1.467 to get the horizontal velocity in feet per second, and then use that to find the time it takes for the ball to travel the horizontal distance to home plate.
Horizontal distance to home plate = 60.5 ft. Horizontal speed Vh = 101.0 mi/h * 1.467 ft/s/mi/h = 148.137 ft/s. Time to reach home plate t = distance/speed = 60.5 ft / 148.137 ft/s = 0.408 s (approximately).
Next, to find out how far the ball falls vertically, we'll use the formula for the distance an object falls due to gravity: d = 0.5 * g * t2, where g is the acceleration due to gravity. In standard English units, g is approximately 32.2 ft/s2. Plugging in the numbers, we get d = 0.5 * 32.2 ft/s2 * (0.408 s)2 = 2.68 ft (approximately).
Thus, a baseball thrown horizontally at 101.0 mi/h will fall about 2.68 feet by the time it reaches home plate.
The correct answer is that the ball would fall vertically by approximately 2.63 ft by the time it reached home plate, 60.5 ft away.
To solve this problem, we can use the kinematic equation for the vertical motion of the ball under the influence of gravity, assuming no air resistance. The equation is:
[tex]\[ y = v_{0y} t + \frac{1}{2} g t^2 \][/tex]
where:
- y is the vertical displacement,
- [tex]\( v_{0y} \)[/tex] is the initial vertical velocity (which is 0 m/s in this case since the ball is thrown horizontally),
- g is the acceleration due to gravity (9.81 m/s, but we will use 32.2 ft/s for consistency with the imperial units given in the problem),
- t is the time of flight.
Since the initial vertical velocity [tex]\( v_{0y} \)[/tex] is 0, the equation simplifies to:
[tex]\[ y = \frac{1}{2} g t^2 \][/tex]
We need to find the time t it takes for the ball to travel 60.5 ft horizontally. The horizontal velocity [tex]\( v_x \)[/tex] is given as 101 mi/h. We convert this to feet per second:
[tex]\[ v_x = 101 \text{ mi/h} \times \frac{5280 \text{ ft}}{1 \text{ mi}} \times \frac{1 \text{ h}}{3600 \text{ s}} \][/tex]
[tex]\[ v_x = 101 \times 5280 \times \frac{1}{3600} \text{ ft/s} \][/tex]
[tex]\[ v_x = 147.67 \text{ ft/s} \][/tex]
Now we can calculate the time t it takes to travel 60.5 ft:
[tex]\[ t = \frac{\text{distance}}{\text{velocity}} = \frac{60.5 \text{ ft}}{147.67 \text{ ft/s}} \][/tex]
[tex]\[ t \ = 0.409 \text{ s} \][/tex]
Using this time, we can find the vertical displacement y :
[tex]\[ y = \frac{1}{2} \times 32.2 \text{ ft/s}^2 \times (0.409 \text{ s})^2 \][/tex]
[tex]\[ y = \frac{1}{2} \times 32.2 \times 0.167 \text{ ft} \][/tex]
[tex]\[ y = 16.7 \times 0.167 \text{ ft} \][/tex]
[tex]\[ y \ = 2.63 \text{ ft} \][/tex]
How long does it take a wheel that is rotating at 33.3 rpm to speed up to 78.0 rpm if it has an angular acceleration of 2.15 rad/s^2?
Answer:
2.17 s
Explanation:
Here, w0 = 33.3 rpm = 33.3 /60 rps
= 2 × pi × 33.3 / 60 rad/ s
= 3.4854 rad / s
w = 78 rpm = 78 / 60 rps
= 2 × pi × 78 / 60 = 8.164 rad / s
a = 2.15 rad/s^2
Use first equation of motion for rotational motion
w = w0 + a t
8.164 - 3.485 = 2.15 × t
t = 2.17 s
A particle with a charge of -2.7 ?C and a mass of 3.8 x 10-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 36 m/s. The only force acting on the particle is the electric force. What is the potential difference VB - VA between A and B? If VB is greater than VA, then give the answer as a positive number. If VB is less than VA, then give the answer as a negative number.
Answer:
0.0018 V
Explanation:
According to the law of conservation of energy, the kinetic energy gained by the particle is equal to the electric potential energy lost:
[tex]\frac{1}{2}mv^2 = q\Delta V[/tex]
where
[tex]m=3.8\cdot 10^{-6} kg[/tex] is the mass of the particle
[tex]v=36 m/s[/tex] is the final speed of the particle
q = -2.7 C is the charge
[tex]\Delta V[/tex] is the potential difference between the two points
Solving for [tex]\Delta V[/tex], we find
[tex]\Delta V= \frac{mv^2}{q}=\frac{(3.8 \cdot 10^{-6} kg)(36 m/s)^2}{-2.7 C}=-0.0018 V[/tex]
The particle has been accelerated by this potential difference: since it is a negative charge, it means that the particle has moved from a point at lower potential towards a point of higher potential.
So, since the initial point is A and the final point is B, the result is
[tex]V_B - V_A = 0.0018 V[/tex]
A sample of blood is placed in a centrifuge of radius 12.0 cm. The mass of a red blood cell is 3.0 ✕ 10^−16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 ✕ 10^−11 N. At how many revolutions per second should the centrifuge be operated?
Answer:
167.85 rev / s
Explanation:
r = 12 cm = 0.12 m, m = 3 x 10^-16 kg, F = 4 x 10^-11 N
F = m r w^2
where, w is the angular velocity.
4 x 10^-11 = 3 x 10^-16 x 0.12 x w^2
w = 1054.1 rad / s
w = 2 π f
f = w / 2 π = 1054.1 / (2 x 3.14) = 167.85 rev / s
The number of revolutions given by the calculated frequency value in which the centrifuge would be operated is 167.8 Hz.
Recall :
Frequency, f = ω/2πForce, F = mω²rMass, m = [tex] 3 \times 10^{-16}[/tex] Force, F = [tex] 4 \times 10^{-11} N[/tex] Radius, r = 12 cm = 12/100 = 0.12 mWe calculate the angular velocity, ω thus :
ω² = F/mr
ω² = [tex] \frac{4 \times 10^{-11}}{3 \times 10^{-16} \times 0.12 = 11.11 \times 10^{5}[/tex]
ω = [tex] \sqrt{1.11 \times 10^{6}} = 1053.56 rad/s[/tex]
Frequency = 1053.56 ÷ (2π)
Frequency = 167.68 Hz
Therefore, the Number of revolutions per seconds would be about 167.8 Hz
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Romeo (75.1 kg) entertains Juliet (58.0 kg) by playing his guitar from the rear of their boat at rest in still water, 2.70 m away from Juliet, who is in the front of the boat. After the serenade, Juliet carefully moves to the rear of the boat (away from shore) to plant a kiss on Romeo's cheek. How far does the 76.5-kg boat move toward the shore it is facing?
Answer: I think 8.7 m
Explanation:
Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields Select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate
Answer:
Wavelength: the distance between two crests of an electromagnetic wave
Frequency: the rate at which electromagnetic waves oscillate
Explanation:
For a transverse wave (such as the electromagnetic waves), we can define the following quantities:
Wavelength: it corresponds to the distance between two consecutive crests (or between two consecutive troughs) of the wave
Frequency: the number of complete oscillations of the wave per unit time
Period: it is the time it takes for the wave to complete one oscillation - it is equal to the reciprocal of the frequency
Amplitude: it is the maximum displacement of the wave, measured with respect to its equilibrium position