Answered: A grinder disc of mass 2.0 kg with 8.0…

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A grinder disc of mass 2.0 kg with 8.0 cm radius rotates at 500 rev/min. What is its rotational kinetic energy?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter8: Rotational Equilibrium And Dynamics

Section: Chapter Questions

Problem 39P: A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a...

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Question

A grinder disc of mass 2.0 kg with 8.0 cm radius rotates at 500 rev/min. What is its rotational kinetic energy?

a) 8.8 J b) 17 J c) 26 J d) 43 J

2. A DVD disc starts rotating from rest and makes 6.0 rad after 3 seconds. Assuming it accelerates uniformly, what is its angular velocity at the end of that time?

a) 2.0 rad b) 3.0 rad c) 4.00 d) 5.0

Definition Definition Rate of change of angular displacement. Angular velocity indicates how fast an object is rotating. It is a vector quantity and has both magnitude and direction. The magnitude of angular velocity is represented by the length of the vector and the direction of angular velocity is represented by the right-hand thumb rule. It is generally represented by ω.

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