A refrigerator operates on average for 8.0 h a day. If the power rating of the refrigerator is 800. W, how much electrical energy does the refrigerator use in a day?

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.