You wish to install an offshore wind turbine to generate electricity at a location where the wind speed is 45 ft/s. After passing through the turbine, the wind speed is reduced to 15 ft/s. If the effective air flow rate through the turbine is 4x105 ft3 /s, what is the maximum power output (in BTU/hr)? [Ws = 3.87x106 BTU/hr]

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

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.