Apenny falls from a windowsill 25.0 m above the sidewalk. how fast is the penny moving when it strikes the ground? (remember that the velocity will be negative due to the downward motion of the penny)

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Which feature of a heating curve indicates a change ofn state

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)