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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 singlemark 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?

```
5 years ago

Deepak Patra
471 Points
```							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.
```
5 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions