Question

a uniform metre rule is balanced at 55 cm mark when weights of 25gf and 60gf are suspended at 15cm and 95 cm mark respectively

Answer 1

Explanation:

Let a wt. of 80gf be placed at a distance x from 40cm mark. Clock wise moments = Anticlock wise moment (80 × x) + 50 × (50 – 40) = 100 × (40 – 5) 80x +500 = 3500 80x = 3500 – 500 = 3000 x = 3000/80 = 37.5cm ∴ A is at 40 + 37.5 = 77.5cm