Homework Help: Physics 102 (College)

Posted by Carla on Sunday, February 27, 2011 at 2:05pm.

A few homework problems.

1) The temp of a monotomic ideal gas remains constant (isothermic) during a process in which 4250 J of heat flows out of gas. How much work is done? Pos/neg?

delta T = 0 and delta U = 0 by inference
Q = 4250
U = 3/2 nRT

Thanks for help/hints

Physics 102 (College) - drwls, Sunday, February 27, 2011 at 2:27pm
Delta U = Qin - Wout = 0

Since Qin is negative, so is Wout.

What is happening is this:

Gas with a piston on top is being compressed slowly while heat is allowed to flow out. Work is done ON (not by) the gas to maintain the constant temperature.

It is an isothermal compression. The entropy decreases.

It makes no difference that the gas is monatomic
Physics 102 (College) - Carla, Sunday, February 27, 2011 at 2:38pm
Thank you drwls! Explaining what the question was asking for helped me realize the problem was actually much simpler than what I was trying to do.

W = -4250

Answer this Question

Related Questions

Physics - The temperature of a monatomic ideal gas remains constant during a ...
Physics - An ideal gas in a rigid container (constant volume) has its pressure ...
physics - We start with 5.00 moles of an ideal monatomic gas with an initial ...
PHYSICS - Three moles of an ideal gas are compressed from 5.5*10^-2 to 2.5*10^-2...
physics - Suppose that the pressure of an ideal gas mixture remains constant at ...
Physics - A sample of helium behaves as an ideal gas as it is heated at constant...
PHYSICS - Identify the following gas compression descriptions as adiabatic, ...
Physics - A sample of helium behaves as an ideal gas as it is heated at constant...
Physics - Which of the following desceriptions about ideal gas is/are correct? 1...
physics question - How much heat had to be put in during the process to increase...

For Further Reading

First Name:
School Subject:
Answer: