"A mass-loaded piston-cylinder system containing air is at 40 lbf/in^2" , 500 °R with a volume of 11 ft3 , while at the stops V = 38 ft3 . An air supply line at 1040 °R is connected to the system by a valve. The valve is then opened until a final pressure of 55 lbf/in.2 at T = 620 °R is reached inside the piston-cylinder assembly. Determine (a) the air mass that enters, (b) the work done in Btu, and (c) the heat transfer in Btu. (Hint: The air is modeled as an ideal gas and the pressure is constant until it reaches to the final pressure).

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

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.