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A wind turbine with a rotor diameter of 50 m is rated at 2900 kW at a hub height wind speed of 11 m/s. It has a cut-in wind speed of 4 m/s and a cut-out speed of 24 m/s. Assume that this machine is located at a site where the mean wind speed is 7 m/s and that a Weibull wind speed distribution can be used with a shape factor of 2.2.
a) Calculate the number of hours per year that the wind is below the cut-in speed.
b) Calculate the number of hours per year that the machine will be shut down due to wind speeds above the cut-out velocity.
c) Calculate the energy production (kWh/yr) when the wind turbine is running at rated power.
A small refracting spyglass telescope has an objective lens with a diameter of 2 inches. The worlds largest refracting telescope at yerkes obseivrvatory has an objective lens with a diameter of 40 inches. Assuming that all light striking the objectiv..
Master of Science in Psychology with a concentration in Industrial Organizational Psychology.
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Max Leonard, vice president of Marketing for Dysk Computer, Inc., must decide whether to introduce a midpriced version of the firm's DC6900 personal computer product line-the DC6900-X.
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