小球连绳做匀速圆�运动在空中受重力和拉力,合力怎么可能指�圆心,这和做匀速圆�运动的物体定义相斥吗 知乎 Template




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tomski小球连绳做匀速圆�运动在空中受重力和拉力,合力怎么可能指�圆心,这和做匀速圆�运动的物体定义相斥吗 知乎 coloring