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Gravity field,motion integrals and integrability
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A nonlinear analysis on stability of a circular orbit effort
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Measurement of gravitational constant G
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The experimenal test of equivalence principle
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A laconic method for studying the period of＇a simple pendulum
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A method for solving the period of a simple pendulum
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Gravity,gravitational waves and detector of gravitational waves
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A discussion on the relation between the gravitation affecting the Sun in the Galaxy and the distance r to the center of the Galaxy
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An analysis of the motion of a single pendulum with variable suspension point and length
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