如图所示小球用绳系住在光�的水平面上做匀速圆�运动当拉力由 f增达到8f时圆运动的半径从r减小到r2在这一过程中拉力所做的功为 Template




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tomski如图所示小球用绳系住在光�的水平面上做匀速圆�运动当拉力由 f增达到8f时圆运动的半径从r减小到r2在这一过程中拉力所做的功为 coloring