Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 13 - Oscillations About Equilibrium - Problems and Conceptual Exercises - Page 449: 72

Answer

The factors are: a) 1 b) 1 c) 1 d) 2 e) 2 f) 4

Work Step by Step

(a) We know that $\omega=\frac{2\pi}{T}$. This equation shows that the angular frequency does not depend on the amplitude; hence the angular frequency does not change. (b) We know that $f=\frac{1}{T}$. Since the frequency depends on time period, not amplitude, it doesn't change. (c) We know that the time period remains the same. (d) The maximum speed is given as $v_{max}=A\omega$ $\implies v_{max}=(2A)\omega$ $\implies v_{max}=2(A\omega)$ Thus, the maximum speed is doubled. (e) We know that $a_{max}=A\omega^2$ $\implies a_{max}=2A\omega^2$ $\implies a_{max}=2(A\omega^2)$ Thus, the maximum acceleration is doubled. (f) The total mechanical energy is given as: $E=\frac{1}{2}m\omega^2A^2$ $\implies E=\frac{1}{2}m\omega^2(2A)^2$ $\implies E=4(\frac{1}{2}m\omega^2A^2)$ Thus, the total mechanical energy increases four times.
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