Dynamics Problem (rigid body)

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pconn5
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Not really sure if this is where this should be but oh well.

Homework Statement


Image attached.

It is given that:

b = 200 mm
mass = 6 kg

Find the tension in cable A immediately after cord B is cut.


Homework Equations


Moment = I*alpha + m*a*d
F = ma?


The Attempt at a Solution


I tried to do
Moment about A = I*alpha (second part is zero?) , so 9.81*6*.1 = 1/6*6*2*.2^2*alpha

I then solved for alpha.

And plugged it into:
Moment about G(center) = I*alpha, but this is wrong and I don't really understand why to be honest with you. It trips me up when the forces are not perpendicular to the center for some reason.

The final answer is T = 23.5 N.

Thanks.
 

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