A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?
- 30cm
- 10cm
-
20cm
- 25m
The correct answer is: C
Explanation
Clockwise moment = Anti-clockwise moment10 x 30 = 15 x X
X = 20cm
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