Aball is dropped from a height of 150cm. the ball has a gravitational potential energy of 5j (jules) before it was released. as the ball falls to the flour, the gravitational potential energy and kinetic energy change.

determine the gravitational potential energy, kinetic energy, and total energy when the ball reaches a height of 90cm as it falls. assomr no energy if transferred to the air as thermal energy.

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain