Agas is compressed in a piston-cylinder assembly from pi = 2 bar to p2-8 bar, v2 = 0.02 m3 in a process during which the relation between pressure and volume s pv1.3 = constant . the internal energy of the gas increases by 50 kj/kg during the process, determine the heat transfer, in kj. kinetic and potential energy changes are negligible.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.