Calculate the mass of the earth. Given radius of the earth = 6 . 4 × 10 6 m and g = 9 . 8 m / s 2 .

Given, The radius of the earth, R = 6 . 4 × 10 6 m The acceleration due to gravity, g = 9 . 8 m / s 2 The equation for acceleration due to gravity is, g = GM R 2 where M is the mass of earth and G = 6 . 67 × 10 - 11 N m 2 kg - 2 So the mass of the earth is, M = gR 2 G = 9 .8 × ( 6 .4 × 10 6 ) 2 6 .67 × 10 − 11 = 6 × 10 24 kg

E M B I B E

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 7

MEDIUM

9th CBSE

IMPORTANT

Earn 100

Derive an expression for acceleration due to gravity on the surface of earth in terms of mass and radius of earth.

Important Questions on Gravitation

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9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 1

Write the Kepler's laws of planetary motion.

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9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 2

(a) State Newton's law of gravitation.

(b) Derive a mathematical expression for Newton's law of gravitation.

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9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 3

What is the difference between

g

and

G

?

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9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 4

What is the difference between mass and weight. How does weight of an object change on moving from equator to poles? When can the weight of an object be zero?

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 1

The mass of the earth is