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1 有一惠斯登差動滑車,欲以150 N之施力吊起900 N之重物,若不計摩擦損失,則滑車之大小定滑輪直徑比為何? 103 統測
A 2:1
B 3:2
C 5:3
D 8:5

M = WF = 2DD-d

900150 = 2DD-d

D:d = 3:2