Question

A small disk of radius R1is mounted coaxially with a larger disk of radius R2. The disks are securely fastened to each other and the combination is free to rotate on a fixed axle that is perpendicular to a horizontal frictionless table top,as shown in the overhead view below. The rotational inertia of the combination is I. A string is wrapped around the larger disk and attached to a block of mass m, on the table. Another string is wrapped around the smaller disk and is pulled with a force as shown. The acceleration of the block is:

A) R1F/mR2
B) R1R2F/(I- mR22)
C) R1R2F/(I+ mR22)
D) R1R2F/(I- mR1R2)
E) R1R2F/(I+ mR1R2)

Answer

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