A 20 kg slab of aluminum is raised by a rope and pulley, arranged vertically, at a

Question:

A 20 kg slab of aluminum is raised by a rope and pulley, arranged vertically, at a constant speed of 10 m/min. At the same time the block absorbs solar radiation at a rate of 0.2 kW. Determine the rate of change of (a) potential energy (PE), (b) internal energy (U), and (c) stored energy (E).