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# Circular motion help watch

1. This question is about automatic brakes.
'Each brake pad and retainer has a mass of 0.30kg and its centre of mass is 60mm from the centre of the shaft. The tension in the spring attached to each pad is 250N. Calculate the maximum frequency of the rotation of the shaft for no braking.

I really have no clue seeing as f=1/T, and I can seem to get T can someone give me a clue?
2. I can't picture what is happening here.
3. this is the only picture that was supplied.
http://i160.photobucket.com/albums/t...928_200111.jpg
4. (Original post by TsunKit)
this is the only picture that was supplied.
http://i160.photobucket.com/albums/t...928_200111.jpg
Strictly speaking I don't think thats Uniform Circular Motion, looks more like Rotational Kinematics to me as it seems to want you to use Moments of Inertia, judging by the fact it gave you mass and a distance from the pivot, but I think you are supposed to say that you find the frequency when the tension in the springs is equal to the centripetal force, judging by the small amount of information visible in the scan of the book, where it says if it spins too quickly the brake pads exert a force on the collar.
5. F=(mw^2)/r

You have F, m, r
w=2pi/T

Go!
6. thanks for the help! but i came to the answer eventually
cant believe it was so simple but i just didnt think it through haha

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