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Homework Statement
An aircraft engine akes in 9000 Joules of heat and discards 6400 J each cycles a) What is the mechanical work output of the engine during one cycle? b) What is the thermal efficiency of the engine?
Homework Equations
e=W/Qh
The Attempt at a Solution
A)
Qh = 9000 J
Qh - WORK = WORKwasted
9000 J - 6400 J = W = 2600 J
B)
e = WORK / Qh
e = 2600 J / 9000 J = .2888 * 100% = 28.9%