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Rotating cylindrical axle

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You are to design a rotating cylindrical axle to lift 800-N buckets of cement from the ground to a rooftop 78.0 m above the ground. The buckets will be attached to a hook on the free end of a cable that wraps around the rim of the axle; as the axle turns, the buckets will rise.

1. What should the diameter of the axle be in order to raise the buckets at a steady 2.00 cm/s when it is turning at 7.5 rpm? (answer in cm)

2. If instead the axle must give the buckets an upward acceleration of 0.400m/s^2, what should the angular acceleration of the axle be? (answer in rad/s^2)

https://brainmass.com/physics/rotation/rotating-cylindrical-axle-70697

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