The following problem will be worth 20 points. (SHOW ALL WORK!!! including your

Question

The following problem will be worth 20 points. (SHOW ALL WORK!!! including your knowns, what you are solving for, equations, units diagrams, and the solution; partial credit is given for the problem setup as well as the solution) A heat engine absorbs 3000 J of heat and produces 1200 J of work. Calculate a) the heat expelled by the engine and b) the efficiency of the engine. Knowns: (symbols, numbers, and units) Solving for: (symbos) part a) 3000J 1200 J part b) Equations: (in symbols) Math Final Answers: (including units) part a) part b)

Explanation / Answer

Solution:

Let us go to the basics first.

(a) Heat expelled by Engine = Heat Input - Work = 3000 J - 1200 J = 1800 J (Answer a)

(b) Efficiency = Work / Heat Input = 1200 / 3000 = 0.4 or 40% (Answer b)

Thanks!!!

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