Question

a uniform metre rule is balanced at the 20 cm mark when mases of 100g and 50g are suspended from the 10 cm and the 30 cm marks respectively. calculate the mass of the metre scale.

Answer 1

Explanation:

Let's denote the weight of the scale by 2.

The scale is 20cm and 100g is suspended on one end (0 mark) when balanced.

So the weight of longer arm i.e. BC is balanced by 100g

So CW moment = A.C.W moment

W × 30 = 20 × 100

= 2000 / 30

= 66.66g

A weight of 100g should be suspended at zero mark.