Answered: 1. A uniform bar of length 60 cm and…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter10: Rotational Motion

Section: Chapter Questions

Problem 59P: A cylinder of mass 10.0 kg rolls without slipping on a horizontal surface. At a certain instant, its...

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1. A uniform bar of length 60 cm and mass 2 kg, freely rotating around a frictionless hinge, is released from rest in its horizontal position. Calculate by conservation of mechanical energy the angular speed of the bar when it is in a vertical position. (Picture)

2. A polishing stone in the shape of a disc of mass 1.5 kg and radius 8 cm, rotates at 600 rpm. The motor that makes it turn is disconnected, keeping an ax on its surface for 10 s, until it stops. What is the angular acceleration of the buffing stone?

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

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