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anonymous
 one year ago
If the efficiency of a heat engine that does 1.00 × 10^3 J of work is 70 percent, then what is the heat input?
A. 1.43 × 10 J
B. 7.00 × 10^2 J
C. 9.30 × 10^2 J
D. 1.43 × 10^3 J
**Not sure! thanks!!:)
anonymous
 one year ago
If the efficiency of a heat engine that does 1.00 × 10^3 J of work is 70 percent, then what is the heat input? A. 1.43 × 10 J B. 7.00 × 10^2 J C. 9.30 × 10^2 J D. 1.43 × 10^3 J **Not sure! thanks!!:)

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1by definition, the efficiency is given by the subsequent formula: \[\eta = \frac{L}{Q}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay! so 70/1.00*10^3 ?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1no, it is: \[Q = \frac{L}{\eta } = \frac{{{{10}^3}}}{{0.7}}\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large Q = \frac{L}{\eta } = \frac{{{{10}^3}}}{{0.7}}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohh oops!! okay so then we get 1428.57 ? so is that choice D?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1yes! that's right!
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