A rigid, insulated tank initially contains 0.5 kg of carbon dioxide (CO2) gas at an absolute pressure of 150 kPa and a temperature of 20 C (State 1). The gas is stirred by a paddle wheel until the absolute pressure of the gas increases to 200 kPa (State 2). Assume that the surrounding pressure is 1 bar and temperature is 20 C. Consider variable specific heats for carbon dioxide. Do not interpolate; use the closest values.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

Wiy doeres rere okhn a pump whon working betwon the same pressure range?