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OpenStudy (jackfrost33):
The actual mechanical advantage of a pulley is 2. The pulley has 3 supporting strings. What is the efficiency of the pulley?
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OpenStudy (anonymous):
Three supporting strings without friction should have given M.A. of 3. Since they gave only 2, the efficiency is 2/3 = 66% Source from : http://openstudy.com/study#/updates/52b22526e4b02932bbbdb64a
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