A machine is used to lift a load of 20 N throug... - JAMB Physics 2011 Question
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?
A
80 J
B
500 J
C
300 J
D
120 J
correct option: b
Efficiency = ( \frac{\text{work output}}{\text{work input}} \times \frac{100}{1} )
= 40 = ( \frac{20 \times 10 }{x} \times \frac{100}{1} )
= 500J
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