Correct Answer: Option C

Explanation

V. R = \(\frac{1}{Sinθ}\)

  m = 20kg

  V.R = \(\frac{1}{Sin 30}\)

  = 2

  Efficiency = 75%

  Load = mg

  = 20 x 10 = 200N

  Efficiency = \(\frac{M.A}{V.R} \times 100\)

  75/100 = \(\frac{M.A}{2}\)

  M .A = \(\frac{75 \times 2}{100}\)

  M. A = 1.5

  Since M. A. = \(\frac{\text{Load}}{\text{Force}}\)

  Force = \(\frac{200}{1.5}\)

  = 133.3N

There is an explanation video available below.

• what is the cut off marks for lafia federal university? Answer this

  1 Answers   ·   14 hours ago
• what is isoelectronics series? Answer this

  1 Answers   ·   Chemistry   ·   13 hours ago
• 49. Fill in the blank space with the correct word(s), from the options lettered A-D. In the sentence "The girl... Answer this

  4 Answers   ·   2 years ago