A machine is used to lift a load of 20 N through a height of 10 m. if the effici...
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?Options
A)
80 J
B)
500 J
C)
300 J
D)
120 J
Related Lesson: Lifts and Apparent Weight | Newton's Laws
The correct answer is B.
Explanation:
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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Efficiency = \( \frac{\text{work output}}{\text{work input}} \times \frac{100}{1} \)
= 40 = \( \frac{20 \times 10 }{x} \times \frac{100}{1} \)
= 500J