Question

A uniform metre rule balances horizontally on a knife edge placed at the 58 cm mark when a weight of 20gf is suspended from one end. (i) Draw a diagram of the arrangement. (ii) What is the weight of the rule?

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Answer

(i) Diagram of the arrangement is shown below:

uniform-metre-rule-horizontally-balanced-q9-concise-physics-icse-class-10-solutions-858x291

(ii) As we know, the principle of moments states that

Anticlockwise moment = Clockwise moment.

W × (58 – 50) = 20 gf × (100 – 58)

⇒ W = 20×42\over 8 = 105 gf

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