5th Edition

ISBN: 9780321976444

Author: James S. Walker

Publisher: PEARSON

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Chapter 10, Problem 77GP

Predict/Calculate Playing a CD The record m an old-fashioned record player always rotates at the same angular speed. With CDs, the situation is different, For a CD to play properly the point on the CD where the laser beam shines must have a linear speed v_t = 1.25 m/s, as indicated in Figure 10-39 (a) As the CD plays from the center outward, does its angular speed increase decrease or stay the same? Explain. (b) Find the angular speed of a CD when the laser beam is 2.50 cm from its center. (c) Repeat part (b) for the laser beam 6.00 cm from the center. b If the CD plays for 66.5 mm, and the laser beam moves from 2.50 cm to 6.00 cm during this time what is the CD's average angular acceleration?

Chapter 10, Problem 77GP, Predict/Calculate Playing a CD The record m an old-fashioned record player always rotates at the

Figure 10-39

Problem 77

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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Chapter 10, Problem 76GP

Chapter 10, Problem 78GP

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