本题目来源于试卷: Gravity and Planetary Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
16.46 Two spherical, nonk9kttn *bq/cvs93sb+a68 add-ro0 xg)bly 1anf qlwq+y(; )y2bttating planets, X and Y, have the same uniform density. Planet X has twice the radius of Planea0(2lb+gtyyf ;xl)ny ) 1qbwq t Y. Let $v_x$ and $v_y$ represent the escape speed at the surfaces of Planet X and Planet Y, respectively. What is the ratio of $v_x:v_y$?
A. 2:1
B. 1:2
C. 1:1
D. 4:1
E. 1:4
参考答案: A
本题详细解析:
暂无
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