本题目来源于试卷: .Gravity..，类别为 美国物理杯赛(Physics Bowl)
[单选题]
96.23: A hypothetical planet has seven times the mass of 4ftr whb m /:ps*ixg5 sbroj*..qi8s4 E .iy 6yex. zy3ifopn+,arth and twice the radius of Earth. The magnitude of the gravitational acceleration at the surface of this planet,.+epiy . xzynoy 3fi6 is most nearly:
A. $2.9m/s^{2}$
B. $5.7 m/s^{2}$
C. $17.5m/s^{2}$
D. $35 m/s^{2}$
E. $122m/s^{2}$
参考答案: C
本题详细解析:
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