An ideal gas with a heat capacity ratio of k = 1.2 undergoes a compression in a piston-cylinder from v1 = 5l to v2 = 2l. the temperature also changes: t1 = 300k, t¬2 = 500k. determine
a) the entropy change of the process in kj/kmol-k and
b) whether the process could occur adiabatically.

Fluids at rest possess no flow energy. a)- true b)- false

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.