Question

1. A person gets into an elevator at the lobby level of a hotel together with his 35kg suitcase, and gets out at the 20th floor 70m above. Determine the amount of energy consumed by the motor of the elevator that is now stored in the suitcase.

2. Electric power is to be generated by installing a hydraulic turbine-generator at a site 180m below the free surface of a large water reservoir that can supply water at a rate of 3500kg/s. Determine the power generator potential.