A 10000 kg boxcar traveling at 20 ms strikes a second, Ask an Expert

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Q. A 10000 kg boxcar traveling at 20 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 11 m/s. What is the mass of the second car?

Q. A thin line of length L with charge Q upon it rotates about its center with a constant angular velocity, w. What are the electric and magnetic fields?

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