Determine the size (volume) of a balloon to lift a mass of 0.1 kg object (including the balloon hardware) if we have access to a gas with a density of ρ_LiftGas = 0.010 kg/m^ 3 to inflate the balloon. The pressure=6.99e2 Pa and the temperature of the outside air is 242 K. The density of the outside air is 1.5e-2.

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain