A solid disk of radius R rolls down an incline in time T.The center of the disk is removed up to a radius of R/2.The remaining portion of the disk with its center gone is again rolled down the same incline.The time it takes is:
A) T.
B) more than T.
C) less than T.
D) requires more information than given in the problem to figure out.

Question

Quizplus · Accepted Answer

Removing the center of the disk reduces its moment of inertia, which increases its angular acceleration, causing it to take more time to roll down the incline.

A Solid Disk of Radius R Rolls Down an Incline