An elevator is rising at constant speed. Consider thefollowing statements: 1. th

Question

An elevator is rising at constant speed. Consider thefollowing statements: 1. the upward cable force is constant 2. the kinetic energy of the elevator is constant 3. the gravitational potential energy of the Earth-elevatorsystem is constant 4. the acceleration of the elevator is zero 5. the mechanical energy of the Earth-elevator system isconstant A. all five are true B. only 2 and 5 are true C. only 4 and 5 are true D. only 1,2, and 3 are true E. only 1,2, and 4 are true why number 5 is not true? give me an explanation.

Explanation / Answer

answer is E reason for 5th The mechanical energy of the earth-elevator system is not constant, because the potential energy is increasing while the kinetic energy is constant. Since the mechanical energy is the sum of the kinetic and potential enrgies, mechanical energy is increasing.

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