The following diagram shows two hockey players who were initially at rest on ice (that is, a horizontal, frictionless surface) pushing off each other. Only the force with which they push off each other contributes to their final speed.. If the 70.0-kilogram hockey player is moving to the left with a speed of 4 meters per second, then the 140.-kilogram hockey player is moving to the right at what speed?

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)