4. An electric motor rotating a grinding wheel at 150 rev/min is switched off. Assuming constant negative angular acceleration of magnitude 2.5 rad /s?, (a) how long does it take the wheel to stop? (b) Through how many radians does it turn during the time found in (a)?

4. An electric motor rotating a grinding wheel at 150 rev/min is switched off. Assuming constant negative angular acceleration of magnitude 2.5 rad /s?, (a) how long does it take the wheel to stop? (b) Through how many radians does it turn during the time found in (a)?

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 20PQ: A wheel starts from rest and in 12.65 s is rotating with an angular speed of 5.435 rad/s. a. Find...

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Question

4. An electric motor rotating a grinding
wheel at 150 rev/min is switched off.
Assuming constant negative angular
acceleration of magnitude 2.5 rad /s?,
(a) how long does it take the wheel to
stop? (b) Through how many radians
does it turn during the time found in
(a)?

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