A disk, initially rotating at 121 rad/s, is slowed down with a constant angular acceleration of magnitude 2.62 rad/s2. (a) How much time does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time? Units (a) Number (b) Number Units

A disk, initially rotating at 121 rad/s, is slowed down with a constant angular acceleration of magnitude 2.62 rad/s2. (a) How much time does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time? Units (a) Number (b) Number Units

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter12: Rotation I: Kinematics And Dynamics

Section: Chapter Questions

Problem 14PQ

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Concept explainers

Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.

Question

A disk, initially rotating at 121 rad/s, is slowed down with a constant angular acceleration of magnitude 2.62 rad/s2. (a) How much time
does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time?
(a) Number i
Units
(b) Number
Units
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