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## Homework Statement

1)The pressure on an ideal gas is cut in half,

resulting in a decrease in temperature to

0.604038 of the original value and a change

in the volume.

Calculate the ratio of the ﬁnal volume to

the original volume of the gas.

2) Steam moves into the cylinder of a steam

engine at a constant pressure of 2.6 × 105 Pa.

The diameter of the piston is 25.6 cm, and the

piston travels 31.3 cm in one stroke.

How much work is done during one stroke?

Answer in units of J

3)A steam engine has a boiler that operates at

295◦F , with a temperature of 180◦F.

Find the maximum eﬃciency of this engine

## Homework Equations

1) This problem I am not sure

2)Same thing. I have 40 problems and I am posting the few I don't get. maybe (Qin = Wout + Delta U)

## The Attempt at a Solution

1) No idea how to attempt.

2)No idea. 3)

295F = 146.11 C + 273= 419.11

180 F = 82.22 C + 273= 355.22

355.22/419.11 = .84755

(1 - .84755) = .1524 = 15.24%