JAMB Physics 2019 Objective — Question 2
Question 2 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.
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The efficiency of a machine is 75%. If the machine can overcome a force of 6000N with another force of 2000N, what is the velocity ratio of the machine?
- A. 4Correct
- B. 5
- C. 3
- D. 2
Explanation
Mechanical Advantage (M.A) = Load/Effort = 6000/2000 = 3. Efficiency = M.A/V.R × 100% ⇒ 75% = 3/V.R ×100% ⇒ V.R = 300/75 = 4.
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