Question

Two smooth sphere each of mass 10 g are kept at 1m apart on a smooth horizontal surface. After what time will they unite being attrached by the force of gravitation​

Answer 1

Explanation:

let the mass of one sphere be M & that of other be m.

G be the gravitational contact= 6.67*10^-11 Nm/kg^2

r be the distance between the two spheres.

Now F = G Mm/r^2

where F is the force of attraction

F =

$6.67 \times 10 {}^{ - 11} \times \frac{10 \times 10}{ {1}^{2} }$

F = 6.67*10^(-9) N