8–75 Oxygen gas is compressed in a piston–cylinder device from an initial state of 0.8 m3/kg and 258C to a final state of 0.1 m3/kg and 2878C. Determine the entropy change of the oxygen during this process. Assume constant specific heats.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise