Material use in wind turbine manufacturing. Approximately 65 gigawatts of electrical power are consumed during periods of peak demand in texas. If the entire demand were to be met by wind power and the wind turbines require 25 kg of dysporsium per megawatt of power generated, calculate the total amount of Dy required to manufacture these turbines, and compare this quantity to the total worldwide production of Dy (see U. S. DOE, 2010).

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody