Q1. The loaded cab of an elevator has a mass of 3000 kg and moves 181 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
Q2. A mass m = 90 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 18.8 m and finally the flat straight section at the same height as the center of the loop (18.8 m off the ground). Because the mass would not make it around the loop if released from the height of the top of the loop (do you know why?) it must be released above the top of loop-the-loop height.