Question

9. A uniform metre rule balances 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 ?
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Answer 1

Answer for a)

the diagram would be something like this :

make a meter scale and on the last end place the weight of 20 gf. At 58 cm mark

the fulcrum and at 50 cm mark the weight of scale (downward direction both can be depicted by arrows.

Answer for b)

sum of anticlockwise force= sum of clockwise force

hence let the weight of meter scale be x

x * distance from fulcrum( here 8 cm) = 20 * 42

x=105 gf