Solution to problems – class 9 – Set 1 Q36

Last updated on June 17th, 2019 at 02:48 pm

Problem Statement

The mass of sun is 2 × 10^30 kg and the mass of earth is 6 × 10^24 kg. If the average distance between the sun and the earth be 1.5 × 10^8 km, calculate the force of gravitation between them.

Solution

M1 = mass of the sun = 2 × 10³⁰ kg
M2 = mass of the earth = 6 x 10²⁴ kg

Distance between the sun and the earth = r = 1.5 × 10⁸ km = 1.5 × 10¹¹ m

Gravitational force between the sun and the earth = F

F = (G M1 M2) / r²
= (6.7 x 10 ^-11) (2 × 10³⁰  x 6 x 10²⁴) / (1.5 × 10¹¹) ²
= 3.57 × 10²² N

Question Set – Physics Problems for grade 9