A 20kg mass is to be pulled up a slope inclined at 30o 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]
- 13.3N
- 73.5N
-
133.3N
- 53.2N
The correct answer is: 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