An air compressor with pressure ratio of 5, compresses air to ¼ th of the initial volume. For inlet temperature to be 27°C determine temperature at exit and increase in internal energy per kg of air?

An electric kettle is made out of stainless steel, weighs two pounds (when empty) and is equipped with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling