本题目来源于试卷: .Gravity..，类别为 美国物理杯赛(Physics Bowl)
[单选题]
94.34: A hypothetical planet orbits a star with mass one-half the mass of u (cndy.q4ai2vz dvq 1.7 x(gcour 5* dyd5kj. g/ nvy /fx;pmd7sbsun. The planet’s orbital radius is the same as the pdfx/5j yn7y ;*5/dgbmdsv. kEarth’s. Approximately how many Earth years does it take for the planet to complete one orbit?
A. 1/2
B. $\frac{1}{\sqrt{2}}$
C. 1
D. $\sqrt{2}$
E. 2
参考答案: D
本题详细解析:
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