What effort will a machine of efficiency 90 app... - JAMB Physics 2013 Question
What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?
A
80N
B
90N
C
100N
D
120N
correct option: c
M.A. = (\frac{Eff \times V.R.}{100})
M.A. = (\frac{90 \times 2}{100})
M.A. = 1.8
E = (\frac{L}{M.A.})
E = (\frac{180}{1.8})
E = 100N
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