FILM How do camera movements function? What information do they provide about characters, objects, and spaces? Do they guide the viewer’s eye toward particular details? Do they align the viewer’s perspective with that of a character?
In: Physics
A) An electron is to be accelerated from a velocity of 5.00×106 m/s to a velocity of 7.00×106 m/s . Through what potential difference must the electron pass to accomplish this?
B) Through what potential difference must the electron pass if it is to be slowed from 7.00×106 m/s to a halt?
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1) What is Compton scattering?
2) Derive an equation for the wavelength of a photon scattered from a nearly free electron in some target material.
3) Why is Compton scattering not observed for visible wavelengths?
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On a quarter-mile drag strip, 402 meters, a car has a racing acceleration of +15.0 m/s2 and a braking acceleration of -13.0m/s2.
9: What is the distance the car moves until coming to a stop after crossing the finish line:
______________ meters _______________feet
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A dielectric-filled parallel-plate capacitor has plate area AAA = 20.0 cm2cm2 , plate separation ddd = 5.00 mmmm and dielectric constant kkK = 5.00. The capacitor is connected to a battery that creates a constant voltage VVV = 12.5 VV . Throughout the problem, use ϵ0ϵ0epsilon_0 = 8.85×10−12 C2/N⋅m2C2/N⋅m2 . |
Part A Find the energy U1U1U_1 of the dielectric-filled capacitor. Express your answer numerically in joules. View Available Hint(s)
Submit Part B The dielectric plate is now slowly pulled out of the capacitor, which remains connected to the battery. Find the energy U2U2U_2 of the capacitor at the moment when the capacitor is half-filled with the dielectric. Express your answer numerically in joules. View Available Hint(s)
Submit Part C The capacitor is now disconnected from the battery, and the dielectric plate is slowly removed the rest of the way out of the capacitor. Find the new energy of the capacitor, U3U3U_3. Express your answer numerically in joules. View Available Hint(s)
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In: Physics
1.The dimensions or units for the quantity (Pressure * Volume) is the same as the dimensions or units of
a.force
b.energy
c.energy/temperature
d.force/temperature
2.According to the ideal gas law, PV = constant for a given temperature and amount of gas. As a result, an increase in volume corresponds to a decrease in pressure. According to the kinetic theory, this happens because the molecules
a.Collide with each other more frequently
b.Move slower on the average.
c.Strike the container wall less often.
d.Transfer less energy to the walls of the container each time they strike it.
3.An air bubble ascends from the bottom of a lake 15 m deep. The temperature at the bottom of the lake is 4oC, and near the surface it is 20oC.
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Calculate the speed (in m/s) of an electron and a proton with a kinetic energy of 1.70 electron volt (eV). (The electron and proton masses are me = 9.11 ✕ 10−31 kg and mp = 1.67 ✕ 10−27 kg. Boltzmann's constant is kB = 1.38 ✕ 10−23 J/K.)
(a) an electron m/s
(b) a proton m/s
(c) Calculate the average translational kinetic energy in eV of a 3.15 ✕ 102 K ideal gas particle. (Recall from Topic 10 that 1 2 mv2 = 3 2 kBT.)
___eV
In: Physics
a) A light bulb has a resistance of 5.0 Ω and a current of 0.4 A when it is connected to a voltage. At what voltage is it operating? (Express your answer to two significant figures.)
b) A piece of copper wire is 1.00 m long and has a diameter of 2.00 mm. Copper has a resistivity of 1.725⋅10−8Ω1.725⋅10−8Ω
Calculate the resistance of this piece of copper wire. (Express your answer to three significant figures.)
In: Physics
The launching mechanism of a popgun consists of a
trigger-released
spring. The spring is compressed to a position yA=-0.12m, and the
trigger is fired.
The projectile of mass m=35g rises to a position yC=20m above the
position yB=0m
at which it leaves the spring.
1-Neglecting all resistive forces, determine the spring
constant.
2-Find the speed of the ball at height yB
In: Physics
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After leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 50.0 m horizontally from the end of the ramp. His velocity, just before landing, is 24.0 m/s and points in a direction 34.1 ° below the horizontal. Neglecting air resistance and any lift that he experiences while airborne, find (a) the magnitude and (b) the direction of his initial velocity when he left the end of the ramp.
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A map suggests that Atlanta is 730 miles in a direction 5.00° north of east from Dallas. The same map shows that Chicago is 560 miles in a direction 21.0° west of north from Atlanta. The figure below shows the location of these three cities. Modeling the Earth as flat, use this information to find the displacement from Dallas to Chicago.
| magnitude | mi |
| direction | ° north of east of Dallas |
In: Physics
A small bouncy ball is dropped from the flat roof of an abandoned, and as-yet unrepurposed industrial building. The ball is observed to take 1/8 of a second to fall across a broken window with the total height of 1.2m. After the ball hits the ground, it bounces back upward and again traverses the window’s height in 1/8s of a second on its way toward the top of the roof. We thus assume that the ball loses no energy upon impact with the ground. If the time that the ball spends below the bottom of the window is 2s, answer the following questions.
a) What is the velocity of the ball at the top and bottom of the window, respectively, when the ball is on its way down?
(b) What is the time it takes the ball to fall from the top of the building to the top of the window?
(c) What is the height of the building?
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A pilot flies her route in two straight-line segments. The displacement vector A for the first segment has a magnitude of 235 km and a direction 30.0o north of east. The displacement vector B for the second segment has a magnitude of 173 km and a direction due west. The resultant displacement vector is R = A + B and makes an angle θ with the direction due east. Using the component method, find (a) the magnitude of R and (b) the directional angle θ.
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Three equal point charges, each with charge 1.30μC , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)
In: Physics