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A wind turbine with a 90m-diameter rotor is rotating at 30 rpm under steady winds at an average velocity of 25 km/h. Assuming the turbine has an efficiency of 32%, determine a) the power produced, kW; b) the tip velocity of the blade, in km/h; c) the revenue generated by the wind turbine per year if the electric power produced is sold at $0.05/kWh. Take the density of air to be 1.20 kg/m3. 2. Helium is to be compressed from 120 kPa and 310 K to 700 kPa and 430 K. A heat loss of 20 kJ/kg occurs during the process. Neglecting kinetic energy changes, determine the power input required for a mass flow rate of 90 kg/min.
underground water is to be pumped by a 70 percent efficient 3 kw submerged pump to a pool whose free surface is 30 m
calculate the vertical displacement at D and the horizontal displacement at Free-Body Diagram should be recalculated with P and Q.
a compressor is used to compress air from 1 bar and 290 k to 10 bar. the compression can be assumed to be adiabatic and
a molten mixture of salt nano3-kno3 is used as the heat transfer fluid for application in a parabolic trough solar
a cantilevered bar is 500 mm long with square cross section 25mm x 25 mm. three perpendicular forces are applied to its
Complete the sketch of the obtuse triangle. It must have an area of 1.75 in.2. Prove the geometry by dimensioning the sketch and showing the area calculation. Show only those dimensions needed for the area calculation. Note: each grid unit = .25 i..
Determine (a) the exit temperature, (b) the exit relative humidity of the air, (c) the exit velocity.
solve the problem in the image. do it step wise in detail. this question is from book fracture mechanics - an
A first class lever in static equilibruim has a 50 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?
Using Newton Raphson method, solve the above equation for as a function of z. Vary z from 0.001 to 0.1 cm in increments of 0.01 cm. plot versus z.
Consider 1.0 kg of austenite containing 1.15 wt% C, cooled to below 727 degrees Celcius (1341 degrees Farenheit).
a solid circular bar of aluminium fits inside a tube of copper with outside diameter of 50mm amp 45mm as inside
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