A mass of 0.1 kg of water, initially at 250 oC and 500 kPa is contained in a rigid container. The water is allowed to cool to the ambient temperature of 25oC. (a) Sketch the process on the P-v ant T-v diagrams, showing the saturation lines, as well as the isotherms passing through the initial and final states. Label the last with the appropriate temperature values, and label all relevant points. (b) Calculate the heat transfer during the process. (c)Calculate the total entropy change for the system and its surroundings.

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.

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

Amass-spring-viscous damper system of mass 3 kg has a frequency of 100 rad/s and is critically damped. its initial conditions are x(0)-3 mm and (0)-2.3 m/s. does the system overshoot its equilibrium position? prove your answer