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State the principle of moments. A uniform metre rule is pivoted at its centre. A weight of 40 gf is suspended at the 20 cm mark. At which mark must a weight of 80 gf be suspended to balance the rule?
Original Khojo Papers practice question — not from a past board paper.
Answer
At the 65 cm mark
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The principle of moments states that for a body in equilibrium the sum of the clockwise moments about a point equals the sum of the anticlockwise moments about the same point. Here 40 × 30 = 80 × d, so d = 15 cm from the centre, that is at the 65 cm mark.
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