A metre rule is pivoted at its mid-point with a vertical force of 10N hanging...

JAMB 2016

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?

A. 30cm
B. 10cm
C. 20cm
D. 25m

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Correct Answer: Option C

Explanation

Clockwise moment = Anti-clockwise moment
10 x 30 = 15 x X
X = 20cm

There is an explanation video available below.

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A metre rule is pivoted at its mid-point with a vertical force of 10N hanging...

Correct Answer: Option C

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