本题目来源于试卷: 美国2021年物理杯赛真题 PHYSICS BOWL 2021，类别为 美国物理杯赛(Physics Bowl)
[单选题]
A simple and correct way to comprehend satellites orbiting Earth is to view them as
A. balanced between gravitational and centripetal forces.
B. beyond the main pull of Earth’s gravity.
C. in mechanical equilibrium with a net force of zero.
D. having sufficient tangential velocities to fall around rather than into Earth.
E. All of the above.
参考答案: D
本题详细解析:
The Earth’s gravity is constantly providing the necessary centripetal force and changing
the direction according to Newton’s 1st Law.
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