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 wity bax xwxpgb-:+1 nyjl0; p65bh ma8hb ,2bgn cxs/16 ivoyss one-half the mass of our sun. The planet’s orbital radius is the same as the Earth’s. Approximately o6s1/h, 8 gc2bvxin ybhow 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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