JAMB Physics 2007 Objective — Question 49
Question 49 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.
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A particle of weight 120N is placed on a plane inclined at an angle 30 degrees to the horizontal. If the plane has an efficiency of 60%, what is the force required to push the weight uniformly up the plane?
- A. 210N
- B. 175N
- C. 100NCorrect
- D. 50N
Explanation
Velocity Ratio = 1/sin(theta) = 1/sin30 = 2. Mechanical Advantage = VR x efficiency = 2 x 0.6 = 1.2. Effort = Load/MA = 120/1.2 = 100N.
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