EASY

Agniveer Vayu

IMPORTANT

Earn 100

An astronaut of mass $m$ is working on a satellite orbiting the earth at a distance $h$ from the earth's surface. The radius of the earth is $R$ , while its mass is $M$ . The gravitational pull $F_{G}$ on the astronaut is

78.26% studentsanswered this correctly

Important Questions on Gravitation

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 8

Different points in the earth are at slightly different distances from the sun and hence, experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the

C M

(centre of mass) causing translation and a net torque at the

C M

causing rotation around an axis through the

C M

. For the earth sun system (approximating the earth as a uniform density sphere),

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 9

The mass of the moon is

(1 / 8)

mass of the earth but the gravitational pull is

(1 / 6)

the pull of the earth. It is due to the fact that

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 1

g

is the acceleration due to gravity on the surface of earth, it's value at a height equal to double the radius of earth is:

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 2

If the value of g acceleration due to gravity at earth surface is

10 m s^{- 2}

. Its value in

m s^{- 2}

at the centre of the earth, which is assumed to be a sphere of radius

R

metre and uniform mass density is

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 3

Two planets of radii in the ratio

2 : 3

are made from the material of density in the ratio

3 : 2

. Then, the ratio of acceleration due to gravity

\frac{g_{1}}{g_{2}}

at the surface of the two planets will be

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 4

At what height from the surface of earth the gravitation potential and the value of g are

- 5.4 \times 10^{7} J k g^{- 2}

and

6.0 m s^{- 2}

respectively? Take the radius of earth as

6400 km

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 5

A body weighs

w

Newton at the surface of the earth. Its weight at a height equals to half the radius of the earth, will be

EASY

Agniveer Vayu

IMPORTANT

Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 8 - Gravitation>Exercise>Q 6

A man weighs

80 kg

on the earth's surface. The height above ground where he will weigh

40 kg

is (radius of the earth is

6400 km

)

An astronaut of mass m is working on a satellite orbiting the earth at a distance h from the earth's surface. The radius of the earth is R, while its mass is M. The gravitational pull FG on the astronaut is

Important Questions on Gravitation

Learn and Prepare for any exam you want !

An astronaut of mass $m$ is working on a satellite orbiting the earth at a distance $h$ from the earth's surface. The radius of the earth is $R$ , while its mass is $M$ . The gravitational pull $F_{G}$ on the astronaut is