# Need help on Torque

1. Nov 6, 2005

### cheez

I applied equation 4 to find the angular acceleration. And then I applied this equation, plugging in the moment of inertia I= m R R/2 and angular acceleration

But I don't get the right answer. The answer is 0.76. Whar's wrong with my step ? thx

2. Nov 6, 2005

### Chi Meson

The differentials are not necessary here.
What did you get for $$\alpha$$?
And what did you get for the answer?

Last edited: Nov 6, 2005
3. Nov 6, 2005

### cheez

The answer is not 0.76. I dun know what's wrong with my step.

Last edited: Nov 6, 2005
4. Nov 6, 2005

### Chi Meson

The angular acceleration has to be in radians/s/s, not rev/s/s. Otherwise, you are doing OK.