A piston-cylinder assembly contains 2 lbm of water, initially at 100 lbf/in.2 and 400o
F. The water undergoes two processes in series: a constant pressure process followed by a constant volume
process. At the end of the constant volume process, the temperature is 300o
F and the water is a two-phase liquid-vapor mixture with a quality of 60%. Neglect kinetic and potential energy
effects.

(a) Sketch T-v and p-v diagrams showing the key states and the processes.
(b) Determine the work and heat transfer for each process, all in Btu.

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.