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October 20, 2019

Solution to problems – class 9 – Set 1 Q35


Problem Statement

What is the force of gravity on a body of mass 150 kg lying on the surface of the earth ?
(Mass of earth = 6 × 10^24 kg; Radius of earth = 6.4 × 10^6 m; G = 6.7 × 10–11 Nm2/kg^2)


Solution

M1 = mass of the body = 150 kg
M2 = mass of the earth = 6 x 1024 kg

Distance between the body and the center of the earth = radius of the earth = r = 6.4 × 106 m


Force of gravity on the body = gravitational force between the body and the earth = F

F = (G M1 M2) / r2 = (6.7 x 10 -11) (150 x 6 x 1024) / (6.4 × 106) 2 = 1472 N

Question Set – Physics Problems for grade 9

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