A solid frictionless cylindrical pulley with a mass of 3kg, Ask an Expert

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Q. A 3160 kg spacecraft is in a circular orbit a distance 2000 km above the surface of Mars.

How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4280km above the surface?

Q. A solid, frictionless cylindrical pulley with a mass of 3kg and a 0.420 m radius is used to draw water from a well. A 1.50kg bucket is attached to a cord that is wrapped around the pulley. If the bucket starts from rest at the top of the well and falls for 3.5s before hitting the water, how far does it fall?

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