A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by...
PHYSICS
WAEC 2016
A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.
- A. 60g
- B. 80g
- C. 120g
- D. 200g
Correct Answer: D. 200g
Explanation
Clock-wise moment = Anti-clock wise
Hence 120 × (35−10)= Xg ×(50−35)
120 × 25 = Xg × 15
Xg = 200g
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