Question

A uniform metre rule is balanced by placing a support below the 45 cm mark and by hanging a 40 gf weight from the 25 cm mark. Find the weight of the metre rule.

Answer 1

Explanation:

from Equilibrium,

clockwise moment=anticlockwise moment

W×15=75×g×25

m×g×15=75×g×25

∴= 75×25/15

=125g