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Two people are standing on a meter-long stationary platform, one at each end. The platform floats parallel to the ground on a cushion of air, like a hovercraft. One person throws a ball to the other, who catches it. The ball travels nearly horizontally. Excluding the ball, the total mass of the platform and people is 118 kg. Because of the throw, this mass recoils. How far does it move before coming to rest again?
What is the number of turns on the coil and what is the magnetic field at the mean radius?
A capacitor consists of two parallel plates, each with an area of 16.0 cm2, separated by a distance of 0.250 cm. What is the charge on either plate
A heater runs on an AC voltage of 120 V and draws a power of 44 W. If this heater were run instead on a DC voltage of 90 V, how much current would flow through the heater
A 120cm3 box contains helium at a pressure of 2.20atm and a temperature of 80.0â??C. What is the initial thermal energy of each gas?
Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 72.0 km/h, What is the speed of B relative to A
You are asked to make some measurements of microwaves using a "polarizing grid" consisting of metal wires.Since an electric field does not penetrate a conductor, linearly polarized microwave radiation will pass through the grid most easily when (m..
The right-side rearview mirror of Mike's car says that objects in the mirror are closer than they appear. Mike decides to do an experiment to determine the focal length of this mirror. What is the focal length of the rearview mirror
You are on a roof, 14.0 m above ground. Dr singer who is 1.78 m tall is 5.0m from the building entrance. How long is the egg in the air
One morning in New York City at 9:AM, Larry looks south and sees the moon is due south. Suppose Curly were to look at the Earth again 7 days later. What would the apparent shape of the Earth be
Romeo takes a uniform 11 m ladder and leans it against the smooth wall of the Capulet residence. The ladder's mass is 25.0 kg, and the bottom rests on the ground 2.8 m from the wall. When Romeo, whose mass is 73 kg, gets 90% of the way to the top, th..
Two long parallel wires carry currents of 2.83 A and 5.41 A. Find the separation distance of the wires expressed in millimeters
A hollow cylindrical copper pipe is 1.40m long and has an outside diameter of 3.90cm and an inside diameter of 2.60cm . How much does it weigh
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