Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 8 - Rotational Kinematics - Focus On Concepts - Page 211: 1

Answer

d) is correct.

Work Step by Step

The angle subtended by the moon is $$\theta_{moon}=\frac{d_{moon}}{r_{moon}}$$ The diameter of the moon $d=3.48\times10^6m$ and the distance between the earth and the moon is $r=3.85\times10^8m$ $$\theta_{moon}=9.04\times10^{-3}rad$$ Similarly, the angle subtended by the pea and the dime is $$\theta_{pea}=\frac{d}{r}=\frac{0.5cm}{71cm}=7.04\times10^{-3}rad$$ $$\theta_{dime}=\frac{d}{r}=\frac{1.8cm}{71cm}=2.54\times10^{-2}rad$$ Because $\theta_{dime}\gt\theta_{moon}$ but $\theta_{pea}\lt\theta_{moon}$, only the dime completely covers your view of the moon.
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