(B) How much energy does the heat engine discharge as heat at the lower temperat
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Question
(B) How much energy does the heat engine discharge as heat at the lower temperature as a result?
The total input energy in the n cycles is nQh and the part of it that is discharged at lower temperature is equal to
PLEASE ANSWER PART B!
i safari File Edit View History Bookmarks Window Help webassign.net ? ? Phy 1010-Ch 12 Hom-W18 Guided Solutions and Study Help Chegg.com EXPLORE The efficiency of a heat engine is e-27%. During each cycle, the engine takes in energy h990 from the high Engime efticen (A) How many cycles of the heat engine are necessary for it to do 6.20 x10 J of work? 0. (B) How much energy does the heat engine discharge as heat at the lower temperature as a result? CONCEPTUALIZE At the end of a complete cycle, the engine has returned to the same state in which it started, energy has been removed from the higher temperature reservoir, and a fraction of the energy determined by the efficiency is converted into work. The remainder of the energy has been released as heat to the lower temperature reservoir Eagiae CATEGORIZE The definition of the efficiency of the heat engine will be used to calculate how much of the input energy is transformed into useful work. Display in a New Window ANALYZE (A) How many cycles of the heat engine are necessary for it to do 6.20 104 J of work? The efficiency of the heat engine is lChl Solve this for Wengl and evaluate Weng-elehl 2(990)- 267.3 This value is the energy transferred by work in each cycle. The number of cycles needed to do the specified amount of work is then 6.2 X 1041-231.9 (B) How much energy does the heat engine discharge as heat at the lower temperature as a result? The total input energy in the n cycles is ngh and the part of it that is discharged at lower temperature is equal to (1-e)nlQkl 12(1- ) n (990 J) = 722.7 x 1Explanation / Answer
In part B
E = (1 - e)*n*Qh
n = 231.9
Qh = 990 J
e = 27% = 0.27
So
E = (1 - 0.27)*231.9*990
E = 16.76*10^4 J
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