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# couple more physics questions

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1. Clausius based his ideas for the second law of thermodynamics on whose work?

Joule

Carnot

Boyle

Clapeyron

would it be B? im not sure

2.

Which equation would you need to rearrange to calculate the work done by a heat engine?

△U=Q+W

QH=W+QL

Q=m △ Hf

△S=Q/T

would it be B ?

Feb 26, 2020

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3.

Which of the following systems shows an increase in entropy?

building a house of cards

water freezing into ice

spilling a jar of pennies

steam condensing to liquid water

would it be C?

4.

Making a heat engine that uses its exhaust heat to do work is restricted according to which principle?

second law of thermodynamics

conservation of matter

first law of thermodynamics

conservation of energy

woul it be A?

Feb 26, 2020
edited by jjennylove  Feb 26, 2020
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This seems to indicate that  your answer to  the first one is  good  :

https://en.wikipedia.org/wiki/Rudolf_Clausius

Feb 26, 2020
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Awesome! thank you for checking that for me.

jjennylove  Feb 26, 2020
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W =  QH -  QL

So

QH =  W + QL

Feb 27, 2020
edited by CPhill  Feb 27, 2020
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thats what i was thinking as well. thank you again!

jjennylove  Feb 27, 2020
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do you know any information for the other 2?

jjennylove  Feb 27, 2020