Question

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 ?
Ans. (ii) 105 gf​

Answer 1

Answer:

When the edge is placed at 58 cm mark and 20 g weight suspended at one end, then uniform scale would be balaced. ... A weight of 20 g is placed at 58 cm mark. So the clockwise moment due to mass of the scale will be W(50-42) = 8W. The anticlockwise moment due to mass 20g will be 20*(50-8) = 840