JAMB Physics 2013 Objective — Question 12
Question 12 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2013 Objective paper, with the correct answer and a full explanation.
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What effort will a machine of efficiency 90% apply to lift a load of 180N if its effort arm is twice as long as its load arm?
- A. 80N
- B. 90N
- C. 100NCorrect
- D. 120N
Explanation
V.R = effort arm/load arm = 2. M.A = Efficiency×V.R = 0.9×2 = 1.8. Effort = Load/M.A = 180/1.8 = 100N.
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