如【圖 25】所示，一無摩擦滑輪半徑 r，裝置於一高 h 的柱頂，力量 P 拉住一物重 W 保持靜止，此時柱底所承受的力矩為何？ (A) wh(B) w(h+r)(C) w(h+2r)(D) 2

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25.如【圖 25】所示，一無摩擦滑輪半徑 r，裝置於一高 h 的柱頂，力量 P 拉住一物重 W 保持靜止，此時柱底所承受的力矩為何？
(A) wh
(B) w(h+r)
(C) w(h+2r)
(D) 2wr

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