Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.00 s, it rotates 20 rad. What is the angular acceleration of the disk? O 15 radis2 O 1.6 radis? O 1.8 radis? O 14 radis?

Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.00 s, it rotates 20 rad. What is the angular acceleration of the disk? O 15 radis2 O 1.6 radis? O 1.8 radis? O 14 radis?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 5STP

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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

Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.00 s, it rotates 20 rad. What is the angular acceleration of the
disk?
O 1.5 rad/s?
O 1.6 rad/s?
O 1.8 rad/s?
O 1.4 rad/s?

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