If mass of Earth is 6 × 10 24 kg , radius of Earth is 6 . 4 × 10 6 m and the gravitational constant is 6 . 7 × 10 - 11 Nm 2 kg - 2 , calculate the value of g.

Given that, Mass of Earth, M = 6 × 10 24 kg Radius of Earth, R = 6 . 4 × 10 6 m Gravitational constant, G = 6 . 7 × 10 - 11 N m 2 kg - 2 We know that the acceleration due to gravity on the surface of earth is, g = G M R 2 That is, g = 6 .67 × 10 − 11 × 6 × 10 24 6 .4 × 10 6 2 = 9 .77 m s − 2

E M B I B E

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 10

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IMPORTANT

Earn 100

Is weight a vector quantity?

Important Questions on Gravitation

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IMPORTANT

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

What will be the effect on the gravitational force between two particles when the distance between the particles is decreased?

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IMPORTANT

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

If a planet X has the same radius as that of the earth but if its mass is double that of earth then find the acceleration on the surface of planet X.

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

How does the value of g vary as

(a) one moves at higher altitudes from the surface of earth

(b) one moves towards the centre of earth from the surface of earth?

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Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 5

What is the acceleration of a pebble thrown vertically upwards when

(a) the pebble is moving upwards

(b) the pebble is at the maximum height

(c) the pebble is falling down?

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IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 6

(a) What is free fall?

(b) Write the equation of motion if an object is thrown in vertically upwards direction.

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

If mass of Earth is

6 \times 10^{24} kg

, radius of Earth is

6.4 \times 10^{6} m

and the gravitational constant is

6.7 \times 10^{- 11} {Nm}^{2} {kg}^{- 2}

, calculate the value of g.

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IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 3 - Gravitation>Summative Assessment>Q 8

If a planet existed whose mass and radius were both half of that of the earth, what would be the acceleration due to gravity at the surface of the planet in terms of that on the surface of the earth?

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IMPORTANT

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

Give certain characteristics of gravitational force.