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bobbles22 is offline
Dec13-09, 04:38 PM
P: 17
Opps. I forgot to add the lump of 5g of putty 4cm from the centre of the disc. This makes the total moment of inertia (0.004+0.005x0.042.

Therefore 0.06f=0.000408x20pi

so f=0.427N

But, thank you if you think that is right