Select the correct answer. what did galileo discover when he dropped two cannon balls of different weights from the leaning tower of pisa? a. the force acting on both of the balls was the same. b. the time for both of the balls to reach the ground was the same. c. a mass-dependent attractive force was exerted by earth on the two balls. d. gravity pulls everything downward. e. the balls exerted an attractive force between each other as they fell.

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)