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Efficiency of Machines

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A machine is used to lift a load of 20 N through a height of 10 m. If the efficiency of the machine is 40% how much work is done ?

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Solution

Dear Student,
$W o r k d o n e = 20 \times 10 = 200 J a s e f f i c i e n c y i s 40 % t h e n t o t a l w o r k d o n e b y m a c h i n e = 200 \times 100 / 40 = 500 J$
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