Solve for Constant Torque: 75g-cm2 to Spin Yo-Yo to 300 rev/min in 1s

[reminiscent]

Homework Statement

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?

Homework Equations

∑

= Iα

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?

 

[TSny]

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

 

[cat__lover]

What did you get as your answer for this?

 

[reminiscent]

What did you get as your answer for this?

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