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+1 vote
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in Physics by (54.6k points)

A uniform metre rule balance horizontally on a knife edge placed at the 58 cm mark when a weight of 20 gf is suspended from one end.

(i) Draw a diagram of the arrangement

(ii) What is the weight of the rule?

1 Answer

+1 vote
by (89.9k points)
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Best answer

(i) Weight mg (W) of rule produces an anti-clockwise moment about the knife edge O. In order to balance it, 20gf must be suspended at the end B to produce clockwise moment about the knife edge O.

(ii) From the principle of moments,

Anticlockwise moment = Clockwise moment

W × (58-50) = 20gf × (100 − 58)

W × 8 = 20gf × 42

W = 20gf x 42/8 = 105 gf

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