质点造句

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1.
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本文研究变质量质点系的相对运动动力学。

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2.
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把此质点作为摆锤拉到平衡位置的一侧，然后释放，摆锤就在平衡位置附近摆动。

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3.
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给出变质量质点的动能定理和一对反推内力作功的表达式，并由此给出软绳问题的正确解释。