WAEC Physics 2016 Objective — Question 10
Question 10 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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10. A uniform metre rule is balanced on a fulcrum placed at the 35 cm mark by suspending a mass of 120 g at the 10 cm mark. Calculate the mass of the metre rule. A. 60g B. 80g C. 120g D. 200g
- A. 60g
- B. 80g
- C. 120g
- D. 200gCorrect
Explanation
Clockwise moment = Anticlockwise moment: M(50-35)=120×(35-10) → M×15=120×25 → M=200g.
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