Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 14

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IMPORTANT

Earn 100

The diagram showing the variation of gravitational potential of the earth with distance from the centre of the earth is

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Important Questions on Gravitation

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IMPORTANT

Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 15

The maximum height reached by a rocket fired with a speed equal to

50 %

of the escape velocity from the earth's surface is,

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Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 16

If the period of a satellite in a circular orbit of radius

R

is

T

, then the period of another satellite in a circular orbit of the radius

4 R

is

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Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 17

A satellite of mass

m

revolves around the Earth of radius

R

at a height

x

from its surface. If

g

is the acceleration due to gravity on the surface of the Earth, then the orbital speed of the satellite is

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Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 18

A remote - sensing satellite of earth revolves in a circular orbit at a height of

0.25 \times 10^{6} m

above the surface of earth. If earth's radius is

6.38 \times 10^{6} m

and

g = 9.8 m s^{- 2},

then the orbital speed of the satellite is

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Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 19

Let

E

be the energy required to raise a satellite to height

h

above the earth's surface and

E'

be the energy required to put the same satellite into orbit at that height. Then,

\frac{E}{E'}

is equal to

HARD

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IMPORTANT

Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 20

A satellite moves around the earth in a circular orbit of radius

r

with speed

v

. If the mass of the satellite is

m

, its total energy is

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IMPORTANT

Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 21

A double star system consists of two stars

A

and

B

that have time periods

T_{A}

and

T_{B}

, radii

r_{A}

and

r_{B}

and masses

m_{A}

and

m_{B}

, respectively. Choose the correct option.

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Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 22

Gravitational acceleration on the surface of a planet is

\frac{\sqrt{6}}{11} g,

where

g

is the gravitational acceleration on the surface of the earth. The average mass density of the planet is

\frac{2}{3}

times that of the earth. If the escape speed on the surface of the earth is taken to be

11 k m s^{- 1},

find the escape speed on the surface of the planet in

k m s^{- 1} .