Unformatted text preview: its blades as it spins. (a) When the rotor faces directly into a 20 mi/h (8.9 m/s) wind, what volume of air (in m 3 ) passes through the rotor's swept area in one second? (b) What is the mass of this amount of air (in kg)? (The density of air is 1.2 kg/m 3 .) (c) What is the total kinetic energy in this amount of air? (d) If the wind turbine has an efficiency of 45% for converting kinetic energy of the wind blowing through it into electrical energy, what is its maximum electric power output in this 20 mi/h wind (in kW)? (e) If the wind speed were to decrease by a factor of 1/2 to 10 mi/h, by what factor would the wind generator's electrical power output decrease? L...
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This note was uploaded on 08/12/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.
 Fall '07
 LECLAIR,A
 mechanics, Work

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