本题目来源于试卷: .Gravity..，类别为 美国物理杯赛(Physics Bowl)
[单选题]
06.50: A rocket is inmytca dx+o..pza( d u/2n11rvju vl+)vq0+dfa6 qm )r a circular orbit with speed vand orbital radius R around a heavy stationary mass. An external impulse is quickly applied to the rocket directly opposite to the velocity and the rocket’s speed is slowed to v/2, putting the rocket into an elliptical orbit. In terms of R, the size of the semi-major axvf)mv0 ++d6 qrjul)a qis a of this new elliptical orbit is
A. $a = 1/4 R$
B. $a = 1/2 R$
C. $ a = 4/7 R$
D. $a = 7/11 R$
E. $a =\frac{\sqrt{8}}{3}R$
参考答案: C
本题详细解析:
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