Abaseball of mass 0.25 kg is hit at home plate with a speed of 40 m/s. when it lands in a seat in the left-field bleachers a horizontal distance 120 m from home plate, it is moving at 30 m/s. if the ball lands 20 m above the spot where it was hit, how much work is done on it by air resistance?

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)