JAMB Physics 2007 Objective — Question 47
Question 47 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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Use the diagram below (a uniform rod 50cm long resting on a fulcrum F, with weights 200N and 40N at either end and the rod's own weight w acting at its centre) to answer this question. What is the weight of the rod?
- A. 120N
- B. 200N
- C. 40N
- D. 80NCorrect
Explanation
Taking moments about the fulcrum: clockwise moment = anticlockwise moment. Solving w(25-15) + 40(45-15) = 200(15-5) gives w = 80N.
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