November 29, 2015

Homework Help: thermodyn. please check work

Posted by Anonymous on Saturday, August 15, 2009 at 10:26pm.

What is the sign of heat(Q), Work(W), or Temperature for these following situations. Say if it's +,-, or 0.

1)You hit a nail with a hammer: +W, Q=0, T=0

2)You hold a nail over a Bunsen burner: Q=+Q, Temp:constant, W=0

3)You compress the air in a bicycle pump by pushing down on the handle very rapidly: -W, Temp:-, Q is -.

4)You turn on a flame under a cylinder of gas, and the gas undergoes an isothermal expansion:
isothermal is constant T, +Q, W is +

5)A flame turns liquid water into steam:

6)High pressure steam spins a turbine:
T inc so +, +Q, +W

7)Steam contacts a cold surface and condenses:
-Q, -W, Temp decreases

Can you check my work and correct me?

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