A grindstone rotates at constant rotational acceleration of 0.35 rad/s2. At time t1 = 0 s, it has a rotational velocity of -2.8 rad/s and a reference line on it is horizontal, at the rotational position 0.0 rad. At what time does the grindstone change its direction of rotation? 8s O 4.5 s O 3.2 s

A grindstone rotates at constant rotational acceleration of 0.35 rad/s2. At time t1 = 0 s, it has a rotational velocity of -2.8 rad/s and a reference line on it is horizontal, at the rotational position 0.0 rad. At what time does the grindstone change its direction of rotation? 8s O 4.5 s O 3.2 s

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter7: Rotational Motion And The Law Of Gravity

Section: Chapter Questions

Problem 6WUE: A grindstone increases in angular speed uniformly from 4.00 rad/s to 12.0 rad/s in 4.00 s. (a)...

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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 grindstone rotates at constant rotational acceleration of 0.35 rad/s2. At
time t1 = 0 s, it has a rotational velocity of -2.8 rad/s and a reference line
on it is horizontal, at the rotational position 0.0 rad. At what time does the
grindstone change its direction of rotation?
5 s
8 s
4.5 s
O 3.2 s

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