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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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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