An Old-Style Elevator Is Connected To A Counterweight By A Cable That Passes Over A Rotating Disk 2.

An old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 2.50 m in diameter as shown in the figure. The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim of the disk but turns with it. Starting from rest, the elevator is raised at a constant rate of 1.225 m/s2. Note that this acceleration is also the tangential acceleration of the rim on the rotating disk. At the instant that the elevator reaches a height of 3.25 m, which of the following regarding the kinematics of the rotating disk is NOT true?

 

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