本题目来源于试卷: .Gravity..，类别为 美国物理杯赛(Physics Bowl)
[单选题]
16.46 Two spherical, non-rotating planets,rg 3lt, (yqhm* X and Y, have the sam3ngn1q l*7 )tytx dgo7e uniform density. Planet X has twice the radius of on7 *g)3t7ndtg1q ylx Planet 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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