A2-kilogram block rests at the edge of a platform that is 10meters above level. the block is launched horizontally from theedge of the platform with an initial speed of 3 meters per second. air resistance is negligible. the time it will take for the blockto reach the ground is most nearly
a. 0.3 s
b. 1.0 s
c. 1.4 s
d. 2.0 s
e. 3.0 s

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)