How much energy must this engine extract from the hot reservoir to do 1000 J of work?

Answer:

You have a formula for efficiency of a heat engine in terms of the two temperatures. Plug them in to get the efficiency. Take 30% of that number. That's the efficiency of this engine. Efficiency = output/input, so plug 1000 J in for the output and the number you got for efficiency, and solve for the input. Or just divide 1000 J by the efficiency.

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You have a formula for efficiency of a heat engine in terms of the two temperatures. Plug them in to get the efficiency. Take 30% of that number. That's the efficiency of this engine. Efficiency = output/input, so plug 1000 J in for the output and the number you got for efficiency, and solve for the input. Or just divide 1000 J by the efficiency.

Randy P

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