Water for a pelton wheel flows from the head water at an elevation of 725 m above the water jet. the penstock supplying the water is 1020 m long with an internal diameter of 0.9 m. the effective friction factor for the penstock and control valves is 0.032. if the diameter of the jet is 0.2 m, determine the torque and power when the power output is a maximum. the radius of the pelton wheel is 2 m.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

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.