# Homework Help: Rate of change in temperature. Another way to do this?

1. Feb 22, 2015

### navm1

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

My question is regarding Part B of this problem, I have solved it but I'm wondering if there is another way to solve it since it says dtheta/dt and one of the hints I found online suggested that I use the chain rule.

2. Relevant equations
Q = mc(deltaT)
Q/t = P

3. The attempt at a solution

For the first part, i just did theta/time to find angular velocity, then multiplied by radius to find the tangential velocity, then just multiplied by the force of 520N by pi/9, the tangential velocity to get 180 Watts.

For the second part I just divided the equation for Q by t to make deltaT/t=P/mc and got 0.064 C/s.

If there was a calculus way to solve this I'd appreciate some help. Thanks

2. Feb 22, 2015

### haruspex

There's no calculus of any interest here, the rate is constant. Your method is as good as any.

3. Feb 22, 2015

### navm1

makes sense. thanks haruspex