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tresehulyo
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Homework Statement
A Carnot Engine operating between 900 Fahrenheit and 90 Fahrenheit produces 40,000 ft-lb of work. Determine (a) the heat supplied, (b) the change in entropy during heat rejection and (c) the thermal efficiency of engine. (answers should be in BTU)
Homework Equations
What formula for Change in S Entropy do i need to use in here
Am i leading to correct answers below?
The Attempt at a Solution
(a) 22.74 BTU
W=NQH
=.60(40000 ft-lb * (9.478* 10-4 BTU / 1 ft-lb)
= 22.74 BTU
(c) 60%
Nth = 1 - (TL/TH)
= 1 - ((90+460)/(900+460))
=.59 = 60%