Answer
a. 99
b. $0.58^{\circ}$
Work Step by Step
a. $M=\frac{v_{obj}}{v_{sound}}$
$$ M=\frac{15000000m/3600s}{42m/s}=99.21 \approx 99$$
b. $sin \theta=\frac{v_{sound}}{v_{obj}}$
$$\theta=sin^{-1}(\frac{1}{99.21})=0.58^{\circ}$$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 12 - Sound - Problems - Page 356: 67
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