passwella.
Menu

JAMB Physics 2007 Question 49

Question 49

Simple Machines

A particle of weight 120 N is placed on a plane inclined at an angle 30° to the horizontal. If the plane has an efficiency of 60%, what is the force required to push the weight uniformly up the plane?

  1. A.210 N
  2. B.175 N
  3. C.100 N
  4. D.50 N.
Show the answer and explanation

Answer: C (100 N)

Explanation

VR = 1/sin 30° = 2. MA = efficiency × VR = 0.6 × 2 = 1.2. Effort = load ÷ MA = 120 ÷ 1.2 = 100 N.