A steel sheet is hot rolled from a thickness of 0.16 cm to a thickness of 0.14 cm using 20 cm diameter rolls. The friction coefficient is 0.05. The steel has a flow stress of 206 MPa. Find the average pressure that the rolls exert on the metal.

1kg of water contained in a piston-cylinder assembly undergoes two processes in series from an initial state where the pressure is 3.0 bar and the temperature is 150°c process 1-2: the water is compressed isothermally to a volume of 0.25 m^3 with 120 kj of work being done to the system. process 2-3: the water is heated at constant volume to a final pressure of 10 bar. a. find the change in internal energy for the system. b. calculate the amount of heat transferred, in kj. c. sketch both processes on a t-v diagram. (196.33 kj/kg, 76.33 kj)