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Physics -> Rotation Help Needed! (see attachment)

Mathematics
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1 Attachment
|dw:1360138607944:dw|
Ok, and?

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Other answers:

where are you stuck ?
|dw:1360138848396:dw|
On torque. I don't know how to find torque.
\(\tau = F_\perp r\) , right?
mg(3) = I (alpha)
I don't understand exactly what this formula means.
I will be around the point where it is pivoted
See its equivalent to F=ma
here its torque = I alpha
Can you calculate moment of inertia about the point where it is pivoted?
\[I = \dfrac{1}{3}m(6^2)\]Right?
RIght.
Ok, just checking. I'm starting to understand a little bit. Thanks.
So mg(3) = I (alpha) simply calculate alpha
Yeah, I got it.
Glad you did.
Its all pretty similar to linear motion, just write net toruqe = I alpha
Ok, One more question. How can you find torque in this system?
1 Attachment
Sorry for the late reply, was busy somewhere.
So whats your progress in this ?
I just need to do the same: find the angular acceleration. I'm not sure what to do with torque. I don't know how to find \(F_\perp\).
|dw:1360140460045:dw|
Can you be a little more clarity?
I remains same, right ?
Right.
But torque isn't, right?
perpendicular distance changes
|dw:1360140731467:dw|
x is the new distance. our eqn will be mgx = I alpha
Ah, thanks!
hmm.

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