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February 1, 2015

February 1, 2015

Posted by **Raf** on Wednesday, February 22, 2012 at 8:34am.

If the system goes from rest and that the forces from c) are applied for 5 seconds and after that 5 seconds no more forces are exerted, how much time does the system take to perform one full rotation.

So I think I'll find the answer using

T = 2pie/w, where I'll find w by first finding my angular acceleration a = t/I

from where I can find w using w = at. Then I solve for T in the first one.

is that correct?

- Physics - Question -
**bobpursley**, Wednesday, February 22, 2012 at 10:24amCalculate I total for the three particles

(I = sum of 1/2 m r^2 for all three).

Then sum torques=I * angacceleration

solve for ang acceleration.

displacement=1/2 * angacceleration*time+wi*t

where wi=angacceleartion*5sec

solve for time from the displacement equation.

- Physics - Question -
**Raf**, Wednesday, February 22, 2012 at 10:31amthanks bob!

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