Question

Calculate the force of attraction between two metal spheres each of mass 90 kg, if the distance between their centres is 40 cm.

(G = 6.67 × 10^-11 N m²/kg²)

Answer 1

Given: m₁ = 90 kg, m₂ = 90 kg,

r = 40 cm = 40 × 10^-2 m.

G = 6.67 × 10^-11 N m²/kg²

To find: Force of attraction (F)

Formula: F = \(\frac{Gm_1\,m_2}{r^2}\)

Calculation: 

From formula,

∴ F = 3.377 × 10^-6 N

The force of attraction between the two metal spheres is 3.377 × 10^-6 N.