# 10000 J of heat energy is absorbed per cycle by a diesel engine that is 11% efficient. How much energy does it expel to the environment per

Question

10000 J of heat energy is absorbed per cycle by a diesel engine that is 11% efficient. How much energy does it expel to the environment per cycle? (J)

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1 year 2021-08-31T01:32:37+00:00 1 Answers 6 views 0

8900 J

Explanation:

Let heat absorbed be Q1 and heat rejected be Q2.

Q1 = 1000 J, efficiency η = 11% = 0.11

Then, Efficiency of engine can be found be using the following formula,

$$\eta = \frac{Q_1-Q_2}{Q_1}$$

⇒ $$0.11 = \frac{10000-Q_2}{10000}\\Q_2 = 10000- 1100= 8900 J$$

Therefore, energy does it expels to the environment per cycle = 8900 J

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