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 in a circular orbi8wr klen qhj2ubytst -i8yhv1al*-( :67/e ivt with speed vand orbital radius R aroun612hn.r .fwo-mltqq+i)gc pz d a heavy stationary mass. An external impulse is qgpwr 2fnh c qm+) .tizq.l-1o6uickly 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 axis 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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