Provide an Appropriate Response $e = \frac { Q _ { h } - Q _ { C } } { Q _ { h } }$

question 39

Multiple Choice

Provide an appropriate response.
-A heat engine is a device that converts thermal energy into other forms. The thermal efficiency, e, of a heat engin defined by
$e = \frac { Q _ { h } - Q _ { C } } { Q _ { h } }$ where $\mathrm { Q } _ { \mathrm { h } }$ is the heat absorbed in one cycle and $\mathrm { Q } _ { \mathrm { C } }$ , the heat released into a reservoir in one cycle, is a constant. Find $\frac { \mathrm { de } } { \mathrm { dQ } _ { \mathrm { h } } }$ .

• A) \(\frac { d e } { d Q _ { h } } = - \frac { Q _ { C } } { Q _ { h } ^ { 2 } }\)
• B) \(\frac { \mathrm { de } } { \mathrm { dQ } \mathrm { h } } = \frac { 1 } { \mathrm { Qh } ^ { 2 } }\)
• C) \(\frac { \mathrm { de } } { \mathrm { dQ } \mathrm { h } } = \frac { \mathrm { Q } _ { \mathrm { C } } } { \mathrm { Q } _ { \mathrm { h } } { } ^ { 2 } }\)
• D) \(\frac { \mathrm { de } } { \mathrm { dQ } \mathrm { h } } = \mathrm { Q } _ { \mathrm { h } } - \mathrm { Q } _ { \mathrm { C } }\)

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Calf

The muscular back part of the lower leg between the knee and ankle, or a young bovine animal.

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A limb on a human or animal's body that supports movement and weight, extending from the hip to the foot.

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Fixed firmly in position; a term often used metaphorically to describe something that is firmly established or secure.