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Suppose you have an ideal gas which gives up heat energy as it does work on its surroundings. Must the temperature increase, decrease or can you not determine how the temperature will behave? Please explain.

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Here the temperature must decrease. We c...

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An ideally efficient heater adds 1100 J of heat to a warm room. How much work does it perform if it removes 1400 J of energy from the outdoors?


A) 2800 J
B) 300 J
C) 400 J
D) 0 - this can't be done.

E) C) and D)
F) A) and B)

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Please explain why your car engine is generally less efficient when its ignition temperature is lower.

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The engine is basically a thermodynamic ...

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