Question

Calculate the force of gravitation between two objects of masses 50 kg and 120 kg respectively kept at a distance of 10 m from one another. (Gravitational constant, G = 6.7 x 10^-11 Nm² kg^-2)

Answer 1

F (gravitational force) = ?
G (gravitational constant) = 6.7 × 10⁻¹¹ Nm² kg⁻²
M (mass of body)= 120 kg
m (mass of body) = 50 kg
d (distance from each other) = 10 m
`F = (GMm)/d^2`
= `(6.7 xx 10^-11 xx 120 xx 50)/(10)^2`
= `(6.7 xx 10^-11 xx 12 xx 5 xx 100)/100`
= `6.7 xx 10^-11 xx 12 xx 5 = 402 xx 10^-11 N = 4.02 xx 10^-9 N` 
Answer : `F = 4.02 xx 10^-9` N