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Wednesday, 11 March 2026
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What effort will a machine of efficiency 90% apply to lift a load of 180N if its ...

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?
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  • A 80N
  • B 90N
  • C 100N
  • D 120N
Correct Answer: Option C
Explanation:
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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