# Thermodynamics problem

1. May 9, 2013

### tigertan

1. The problem statement, all variables and given/known data

I'm getting a bit stuck with this problem..

Given a volume, it's specific heat at constant volume, an initial temperature, pressure (atmospheric) and the power of a heater within this volume, I am expected to calculate the change in temperature for the body.

2. Relevant equations
I understand that Cv=du/dT. I also understand that the volume doesnt change as it is an isochoric process.

We get dT= dq/Cv=du/Cv. I don't understnad how to get the heat value. I've converted the power of the heater from Watts to Joules per hour..

2. May 9, 2013

### Staff: Mentor

From the data given you can calculate temperature change per time unit only (so you can say "temperature increased by ... °C per second", but not "temperature increased by ... °C").

3. May 9, 2013

### tigertan

how can i calculate the change of heat though, wiht what has been given to me?

4. May 9, 2013

### tigertan

am I expected to look up the internal energy on a superheated table and interpolate across to find the first internal energy?

5. May 10, 2013

### Staff: Mentor

You can't without assuming some period of time.