Answer
$3.33$ rad/s.
Work Step by Step
The initial moment of inertia of $5*10^{-4}$ increases by $0.02*0.1^2$ to $7*10^{-4}$ when the putty is added. Since angular momentum is conserved, the angular speed decreases to $5/7 *4.7 = 3.33$ rad/s.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 11 - Rolling, Torque, and Angular Momentum - Problems - Page 324: 55
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