Answer
$0.5\pi$ radians.
Work Step by Step
$15$ rotations per minute means $0.25$ rotations per second, which is $0.25\cdot2\pi=0.5\pi$ radians.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - 13.2 Define General Angles and Use Radian Measure - 13.2 Exercises - Problem Solving - Page 864: 51a
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