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(solution) Determine the power spectral density of the wind at a site where


Determine the power spectral density of the wind at a site where the turbulence intensity is 15% and the hub height is 90 m, and the annual mean windspeed is 7 m/s

A gas is contained in a vertical cylinder 3 inches in diameter under a piston whose mass is 50 lbm. The local gravitational acceleration is 32.4 ft/s2 and the atmospheric pressure acting on the outside of the piston is 14.7 psia. What is the absolute pressure of the gas in the cylinder in psia? What is the absolute pressure of the gas in Pa? What is the gage pressure of the gas in Pa?



2 3

 

Area is 0.04908 ft 2

 

4 12 Force due to postion weight is 50 lbm 32.4 ft/sec 2 1620 lbf

 

1620 lbf

 

klbf

 

Pressure is 39.531 2

 

0.04908

 

ft

 

lbf

 

1 2 47.880 Pa

 

ft

 

Guage pressure is 39.531 47.880...

 


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Sep 13, 2020

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