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Physics Part-I

Gravitation

Choose the correct alternative : (a) Acceleration due to gravi

Physics Part-I

Class 11

NCERT

Chapter 1: Physical World

16 questions

Chapter 2: Units and Measurements

51 questions

Chapter 3: Motion in Straight Line

50 questions

Chapter 4: Motion in a Plane

43 questions

Chapter 5: Laws of motion

52 questions

Chapter 6: Work, Energy and Power

41 questions

Chapter 7: System of Particles and Rotational Motion

45 questions

Chapter 8: Gravitation

33 questions

Answer the following:
(a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means?
(b) An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity?
(c) If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun's pull is greater than the moon's pull. However, the tidal effect of the moon's pull is greater than the tidal effect of the sun. Why?

Choose the correct alternative :
(a) Acceleration due to gravity increases/decreases with increasing altitude.
(b) Acceleration due to gravity increases/decreases with increasing depth (assume the earth to be a sphere of uniform density).
(c) Acceleration due to gravity is independent of mass of the earth/mass of the body.
(d) The formula

- G M m (1/ r_{2} - 1/ r_{1})

is more/less accurate than the formula

m g (r_{2} - r_{1})

for the difference of potential energy between two points

r_{2}

and

r_{1}

distance away from the center of the earth.

Suppose there existed a planet that went around the sun twice as fast as the earth.What would be its orbital size as compared to that of the earth ?

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Question

Easy

Solving time: 2 mins

Choose the correct alternative :
(a) Acceleration due to gravity increases/decreases with increasing altitude.
(b) Acceleration due to gravity increases/decreases with increasing depth (assume the earth to be a sphere of uniform density).
(c) Acceleration due to gravity is independent of mass of the earth/mass of the body.
(d) The formula $- G M m (1/ r_{2} - 1/ r_{1})$ is more/less accurate than the formula $m g (r_{2} - r_{1})$ for the difference of potential energy between two points $r_{2}$ and $r_{1}$ distance away from the center of the earth.

(a) Acceleration due to gravity increases/decreases with increasing altitude.

(b) Acceleration due to gravity increases/decreases with increasing depth (assume the earth to be a sphere of uniform density).

(d) The formula

- G M m (1/ r_{2} - 1/ r_{1})

is more/less accurate than the formula

m g (r_{2} - r_{1})

for the difference of potential energy between two points

r_{2}

and

r_{1}

distance away from the center of the earth.

Views: 5,984 students

Updated on: Jun 19, 2022

Book:

Physics Part-I (NCERT)

Found 6 tutors discussing this question

Samuel Discussed

- G M m (1/ r_{2} - 1/ r_{1})

is more/less accurate than the formula

m g (r_{2} - r_{1})

for the difference of potential energy between two points

r_{2}

and

r_{1}

distance away from the center of the earth.

8 mins ago

Discuss this question LIVE

8 mins ago

Text solutionVerified

(a) Acceleration decreases according to formula

g^{'} = g (1 - \frac{2 h}{R})

,
where h is height and R is radius of earth.

(b) Acceleration decreases according to formula

g^{'} = g (1 - \frac{d}{R})

where d is depth and R is radius of earth.

g = \frac{G M _{e}}{R _{e}^{2}}

Hence, it is independent of mass of body, but is dependent on mass of earth.

(d) Gravitational potential energy is given by the formula:

U = - \frac{G m _{1} m _{2}}{r}

g = \frac{G M _{e}}{R _{e}^{2}}

assug distance between object and earth is nearly equal to the radius of the earth.

Substituting the second equation in first, we get

U \approx m g h

Hence, the first formula is more accurate.

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Practice more questions from Physics Part-I (NCERT)

- G M m (1/ r_{2} - 1/ r_{1})

is more/less accurate than the formula

m g (r_{2} - r_{1})

for the difference of potential energy between two points

r_{2}

and

r_{1}

distance away from the center of the earth.

Suppose there existed a planet that went around the sun twice as fast as the earth.What would be its orbital size as compared to that of the earth ?

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Question Text	Choose the correct alternative : (a) Acceleration due to gravity increases/decreases with increasing altitude. (b) Acceleration due to gravity increases/decreases with increasing depth (assume the earth to be a sphere of uniform density). (c) Acceleration due to gravity is independent of mass of the earth/mass of the body. (d) The formula $- G M m (1/ r_{2} - 1/ r_{1})$ is more/less accurate than the formula $m g (r_{2} - r_{1})$ for the difference of potential energy between two points $r_{2}$ and $r_{1}$ distance away from the center of the earth.
Updated On	Jun 19, 2022
Topic	Gravitation
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 3
Upvotes	319
Avg. Video Duration	5 min

Text solutionVerified

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