A 5-ft³ tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the surroundings. Determine the paddle-wheel work done. Neglect the energy stored in the paddle wheel. The gas constant and molar mass of oxygen are R= 0.3353 psia ft/lbm-R and M = 32 lbm/lbmol. The specific heat of oxygen at the average temperature of Tavg = (735 +540)/2 = 638 R is Cv,avg= 0.160 Btu/lbm.R. The paddle-wheel work done is Btu.

Elements Of Electromagnetics
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A 5-ft³ tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to
20 psia. During the process 20 Btu of heat is lost to the surroundings. Determine the paddle-wheel work done. Neglect the energy
stored in the paddle wheel. The gas constant and molar mass of oxygen are R= 0.3353 psia ft/lbm-R and M = 32 lbm/lbmol. The
specific heat of oxygen at the average temperature of Tavg = (735 +540)/2 = 638 R is Cv,avg= 0.160 Btu/lbm.R.
The paddle-wheel work done is
Btu.
Transcribed Image Text:A 5-ft³ tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the surroundings. Determine the paddle-wheel work done. Neglect the energy stored in the paddle wheel. The gas constant and molar mass of oxygen are R= 0.3353 psia ft/lbm-R and M = 32 lbm/lbmol. The specific heat of oxygen at the average temperature of Tavg = (735 +540)/2 = 638 R is Cv,avg= 0.160 Btu/lbm.R. The paddle-wheel work done is Btu.
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