Question

A uniform metre rule balances on a knife edge at 60cm mark when weight of 20n is suspended at one end.calculate the weight of the metre rule.

Answer 1

well the center of mass of the ruler is at 50
so the weight must be at a point above 60 like 100
w *(60-50) = 20 (100-60)
10 w = 20*40
w = 2*40 = 80 N

Answer 2

A uniform metre rule balances on a knife edge at the 60 cm mark when a weight of 20N is suspended at one end. calculate the weight of the metre rule.