All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 10

HARD

9th ICSE

IMPORTANT

Earn 100

Derive an expression for force of attraction between two bodies.

Important Questions on Gravitation

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9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 10

The Earth is acted upon by gravitation of Sun even, then it does not fall into the sun. Why?

HARD

9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 11

If a body is dropped from a height h from ground, how the time elapsed varies with height h (if

h = 0

at top)?

MEDIUM

9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 12

A ball is thrown with a velocity

u m / s

. Show that time taken to reach maximum height is exactly equal to come back to the ground.

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9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 13

Calculate the magnitude of gravitational force between two electrons placed at a separation of

1 fm

.(Take, mass of electron =

9.1 \times 10^{- 31} kg

).

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9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 14

A body weighs

40 kg

on the surface of the Earth. Find the force of attraction between them, (Take,

M_{e} = 6 \times 10^{24} kg

and

R_{e} = 6.4 \times 10^{6} m

,

G = 6.7 \times 10^{- 11} N m^{2} {kg}^{- 2}

).

HARD

9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 15

Find the acceleration due to gravity on Mars surface, using data given below (take the mass of Mars $= 6.4 \times 10^{23} kg$ and take the radius of Mars $= 3.4 \times 10^{6} m$ )

HARD

9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 16

In a hypothetical case, if the diameter of the earth becomes a double of its present value and mass becomes eight times of present value, then find the value of acceleration due to gravity.

HARD

9th ICSE

IMPORTANT

All In One ICSE Physics>Chapter 4 - Gravitation>CHAPTER EXERCISE>Q 17

A car falls off an edge and drops a floor in $10 s$ . Find the speed of striking the ground (take $g = 10 m / s^{2}$ ).