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Two students perform a simple experiment. The first student observes the orientation of a stationary disk with a single mark on the edge of the rim. He then looks away. The second student then gives the disk a constant rotational acceleration of 3.0 rad/s 2 for a time of 4.0 seconds; she then brings the disk to a halt with constant angular acceleration in a time of 0.10 s. The first student is now allowed to look at the disk again. (a) From the point of view of the first student, through what angle did the disk move? (b) What was the average angular velocity of the disk?

Two students perform a simple experiment. The first student observes the orientation of a stationary disk with a single
mark on the edge of the rim. He then looks away. The second student then gives the disk a constant rotational acceleration of 3.0 rad/s2 for a time of 4.0 seconds; she then brings the disk to a halt with constant angular acceleration in a time of 0.10 s. The first student is now allowed to look at the disk again. (a) From the point of view of the first student, through what angle did the disk move? (b) What was the average angular velocity of the disk?

Grade:upto college level

1 Answers

Deepak Patra
askIITians Faculty 471 Points
8 years ago
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The first student sees the disk rotating through a smaller number of revolutions, even smaller than 1 revolution. Therefore, he will either observe the wheel rotating through 0.91 revolutions in one direction or 1 rev – 0.91 rev = 0.09 rev in the other direction.

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