Answer
Please see the work below.
Work Step by Step
We know that according to law of conservation of energy
$L_i\omega_i=L_f\omega_f$
This simplifies to:
$\omega_f=(\frac{L_i}{L_f})\omega_i$
$\omega_f=(\frac{8.588}{4.2})(3.0)=6.1\frac{rev}{s}$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 11 - Exercises and Problems - Page 201: 30
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