Useful work done with a simple mechanism is 0.3 shares less than the work expended. which is the efficiency of the mechanism.
By definition, the efficiency of any mechanism is defined as: Ap / Az, where Ap is the useful
the work done by the mechanism, Az is the total work expended by the mechanism. According to the condition of this problem, An = Az-0.3 * Az = 0.7 * Az, then
Efficiency = 0.7 * Az / Az = 0.7 = 7/10 * 100% = 70%.
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