A uniform metre scale of mass 80g is to be balanced at the 70 cm marks. Find from where must a mass of 60g be suspended to do so.

Answer/Solution:

Mass of the metre scale, M = 80 g; = .08 Kg;
This mass balance at 70 cm;

Calculate, from where mass 60 g would be balanced = ?

As per the rule,

0.08 x 70 = 0.06 x Balance point

Balance point = 560/6
Balance point = 93.3 cm;

If 60g suspended then, the balance point of the scale is 93.3 cm;