Q.
A uniform disc of radius ‘R” and mass ‘M’ can rotate without friction on an axis passing through its centre and perpendicular to its plane. A cord is wound at the rim of the disc and a uniform force of F is applied on the cord. The tangential acceleration of a point on the rim of the disc is
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a
2FM
b
FM
c
F2M
d
F4M
answer is A.
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Detailed Solution
FR=Iα=MR22aRa=2Fm
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