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7.質量60 kg的人站在一重30 kgw的平台上,垂直下拉繞過滑輪組的繩子,如右圖所示。忽略滑輪及繩子的質量及摩擦阻力,此人利用平台載物重不得超過多少方可等速將平台拉起?(A)30 (B)60 (C
問題詳情
7.質量60 kg的人站在一重30 kgw的平台上,垂直下拉繞過滑輪組的繩子,如右圖所示。忽略滑輪及繩子的質量及摩擦阻力,此人利用平台載物重不得超過多少方可等速將平台拉起?
(A)30
(B)60
(C)90
(D)120
(E)180 kgw
參考答案
答案:[無官方正解]
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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