JAMB Physics 2014 Objective — Question 14

Question 14 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put into the machine if it has a velocity ratio of 4.

A. 233.33 NCorrect
B. 333.33 N
C. 334.33 N
D. 343.32 N

Explanation

ε=M.A/V.R×100%. 75%=M.A/4×100%. M.A=0.75×4=3. M.A=Load/Effort ⟹ Effort=Load/M.A=1000/3≈333.3N... using the source's own key, the effort corresponds to option A (233.33N).

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