本题目来源于试卷: Physics Unit5: Circular Motion & Gravitation，类别为 国际高中通用物理
[单选题]
Two moons orbit a planeb3cc mj -uzy3kcud9wg*l* ,j8ubr+7+msn z4u t in nearly circularwnpe de.5vp( 22 oyy1i orbits. Moon A has orbital radius r, and moon B has orbital radiuv ed(yop212yewn i5p .s 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A. $20 \; days$
B. $80 \; days$
C. $160 \; days$
D. $320 \; days$
参考答案: C
本题详细解析:
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