A. 87N
B. 73.5N
C. 133.3N
D. 533.2N
Correct Answer:
Option C – 133.3N
Explanation
V. R = 1/Sinθ
m = 20kg
V.R = 1/Sin30
= 2
Efficiency = 75%
Load = mg
= 20 x 10 = 200N
Efficiency = M.A/V.R×100
75/100 = M.A/2
M .A = 75×2/100
M. A = 1.5
Since M. A. = Load/Force
Force = 200/1.5
= 133.3N
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