JAMB Physics 2020 Objective — Question 11
Question 11 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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11. A uniform metre rule of weight 1.0N is pivoted at the 40cm mark. A weight of 2N is hung from the 15cm mark. Where must a weight of 2N be placed to balance the rule?
- A. A. 20cm mark
- B. B. 60cm markCorrect
- C. C. 50cm mark
- D. D. 40cm mark
Explanation
Taking moments about the pivot (40cm mark): Clockwise moment = Anticlockwise moment. 1x(50-40) + 2x(x-40) = 2x(40-15). 10+2x-80=50. 2x=120. x=60cm mark.
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