Physics
JAMB 1991
A 20kg mass is to be pulled up a slope inclined at 30
o to the horizontal. If the efficiency of the plane is 75%, the force required to pull the load up the plane is [g = 10ms
-2]
-
A.
13.3N
-
B.
73.5N
-
C.
133.3N
-
D.
53.2N
Correct Answer: Option C
Explanation
Efficiency = m.A x \(\frac{1}{V.R}\) X 100%
75 = \(\frac{20 \times 10}{effort}\) x \(\frac{1}{\frac{g}{sin\theta}}\) x 100%
Effort = 133.3N
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