JAMB Physics 2014 Objective — Question 15

Question 15 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.

A wheel and axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

A. 80%Correct
B. 85%
C. 87%
D. 90%

Explanation

M.A=Load/Effort=800/250=3.2. V.R=Radius of wheel/Radius of axle=800/200=4. ε=M.A/V.R×100%=3.2/4×100%=80%.

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