Homework Help: physics

Posted by Will on Saturday, April 26, 2008 at 1:29pm.

A system does 196 J of work on its environment and gains 40 J of heat in the process.
(a) What is the change in the internal energy of the system?
J

(b) What is the change in the internal energy of the environment?
J

I thought the answer would be +40 for the system and -40 for the enveironment sin the system gain 40 j of heat, but that is not the correct answer. What am I doing wrong.

physics - DrBob222, Saturday, April 26, 2008 at 4:14pm
Work done by the system is -.
It seems to me that the system does 196 J work so that is -196 J. It receives 40 J of heat which is +. Therefore, -196+40 would be the change. The environment would be the negative of that. Check my thinking.

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