Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 8 - Think and Solve: 50


a. The telescope's angular momentum is conserved (does not change) because no net external torque acts on it. The angular momentum is mvL. $$(m)(v_{initial})(L) = (m)(v_{new})(0.33L)$$ $$v_{new} =(v_{initial})\frac{L}{0.33L} = 3.0 v_{initial} $$ b. Plug in values. $$v_{new} =( 1.0 \frac{m}{s})\frac{L}{0.33L} = 3.0 \frac{m}{s} $$
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