A mover’s dolly is used to transport a refrigerator up a ramp into a house. The refrigerator has a mass of 115 kg. The ramp is 2.10 m long and rises 0.850 m. The mover pulls the dolly by a force of 496 N up the ramp. The ramp and dolly constitute a machine.
1. What work does the mover do?
2. What is the efficiency of the machine?
3. What is the work done on the refrigerator by the machine?