# Constant torque

1. Apr 2, 2016

### reminiscent

1. The problem statement, all variables and given/known data
A yo-yo has a moment of inertia of 75.0 g-cm2 about its rotation axis. What is the constant torque required to make it spin to 300 rev/min in one second, starting from rest?

2. Relevant equations
= Iα

3. The attempt at a solution
I was thinking since the question is asking for constant torque, angular acceleration would also have to be constant. Therefore, I would just find angular acceleration (using (ω(t) - ω0)/(t2-t1)) then multiply that angular acceleration by the moment of inertia. Is that correct thinking?

2. Apr 2, 2016

### TSny

Yes, your thinking is correct. Be careful with the units.

3. Apr 3, 2016

### cat__lover

What did you get as your answer for this?

4. Apr 4, 2016

### reminiscent

2.36 x 10^-4 kg*m^2/s^2

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