From the table of densities found in this experiment, iron has a density of 7. 85 g/cm3 and water has a density of 1. 0 g/ml. Iron is denser than water and will sink when placed in water. Explain how ships made from iron stay afloat using density principles.

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump