A scuba diver uses an empty vertical tube, closed at the top and open at the bottom, to measure her depth below sea level when diving in the ocean. The tube is 7.20 cm long. She dives below the surface until the water has risen into the tube a distance of 2.31 cm from the open end of the tube. Assuming the temperature of the air in the tube stays constant during the dive, what is the diver's depth at this point? The average density of sea water is 1,030 kg/m3.

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)