A student who is 1.5m tall shoots a 0.03 kg dart out of a blow gun horizontally. The dart lands 7.3m away. A) How fast did the dart leave from the blow gun?
B) If the dart took 0.21s to exit out of the blow gun while it was being shot out, with what average force did the boy blow into
the gun?

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)