標題: AL 87 MC mechanics [打印本頁] 作者: Galneryus 時間: 2008-11-7 19:24:04 標題: AL 87 MC mechanics
AL 87 MC mechanics
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an object of mass 3kg is tied to another object of mass 2 kg with a string passing over a fixed smooth pulley. The weight of the pulley is negligible. When the object move under the action of gravity, the vertical upward force acting on the acle of the pulley