The volume and the average density of an irregularly shaped body are to be determined by using a spring scale. The body weighs 7200 N in air and 4790 N in water. Determine the volume and the density of the body. State your assumptions.

An ideal vapour-compression heat pump cycle provides a heating rate of 12btu/s. the working fluid, refrigerant 134a, enters the compressor as a saturated vapor at 40 psi and exits the condenser as a saturated liquid at 160 psi. determine (a) the mass flow rate of the working fluid in lb/min (b) the compressor power in btu/min. (c) the coefficient of performance.