Matric Part 1/9th Class Physics Chapter 5 Long Question With Answer for Unit 5 Gravitation

9th Class Physics chapter 5 Long Questions

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Online Long Questions For Chapter 5 "9th Class Physics Chapter 5 Long Question Preparation "

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Physics (New Book) - 9th Class Physics Chapter 5 Long Question Preparation

Question # 1

Q no: 6 (B) Calculate the value of g at a height of 3600 km above the surface of the Earth.

Ans 1: Solution:
g_n =?
h = 3600km = 3600 x 1000m
R = 6400 x 10³ m
G = 6.673 x 10-¹¹ Nm²kg-²
Me = 6x 10²⁴ kg
g = GMe/R²
g_n = Gme/(R+h)²
6.673 x10-¹¹ x 6 x 10²⁴/6400 x10³ + 3600 x10³
g_n = 4ms-²

Question # 2

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

Ans 1: Solution:
Height= 850 km
= 850 x 1000m
850000m = 8.5 x 10⁵m
orbital speed = v=?
V=√GMe/(R+h)
=√6.673 x 10-¹¹ x 6 x 10²⁴/(6.4 x 10⁶ + 8.5 x 10⁵ )
= 743.13 ms-¹

Question # 3

How gravitation is discovered. what is the force of gravitation

Ans 1: The first man who came up with the idea of gravity was Isaac newton. It was an evening of 1665 when he was trying to solve the mystery why planets revolve around the sun. Suddenly an apple fell from the tree under which he was sitting. The idea of gravity flashed in his mind. he discovered not only the cause of falling apple but also the cause that makes the planet to revolve around the sun and the moon around the earth.
Force of gravitation: force due to which every body of the universe attracts every other body is called force of gravitation.

Question # 4

What do you mean by artificial satellite

Ans 1: Satellite: an object that revolves around a planet is called a satellite
Natural satellite: the moon revolves around the earth so moon is a natural satellite of the earth
Artificial; scientists have sent many objects into space. Some of these objects revolve around the earth. These are called artificial satellites.
Ans 2: Uses of artificial satellite: Most of the artificial satellites , orbiting around the earth are used for communication purpose.
Artificial satellites carry instruments or passengers to preform experiments in space. Large number of artificial satellites have been launched in different orbits around the earth.
Dish antennas sending and receiving the signals from them have fixed direction depending upon their location on the earth.

Question # 5

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

Ans 1: Solution:
Height= 850 km
= 850 x 1000m
850000m = 8.5 x 10⁵m
orbital speed = v=?
V=√GMe/(R+h)
=√6.673 x 10-¹¹ x 6 x 10²⁴/(6.4 x 10⁶ + 8.5 x 10⁵ )
= 743.13 ms-¹

Question # 6

Determine the mass of earth using Newtons law of gravitation

Ans 1: Mass of earth: the mass of earth can be calculated by using Newtons law of gravitationExplanation; consider a body of mass m is placed on the surface of the earth. The distance between the center of the body and the earth is R which is equal to radius of the earth. The mass of earth is Me.We know that the force with which the earth attracts a body on its surface towards its center is equal to the weight of the body

Question # 7

Q no: 5 (A) What ismeant by the force of gravitation? Also explain the law of gravitation.

Ans 1: everybody in the universeattracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

According to the law of gravitation the gravitationalforce of attraction F with which the two masses m1 and m2 separated by a distance `d' attract each other is given by:
F x m1m2
F x 1/d²
F x m1m2/d²
F=G m1m2/d²

Question # 8

Describe the motion of artificial satellite and derive the formula for the orbital speed of the artificial satellite

Ans 1: Artificial satellite: Artificial satellites are launched for space research and telecommunication. With their help, we are able to enjoy live coverage of cricket matches, Olympic games and many other programs directly on our television sets.
Artificial satellites keep on revolving around the earth in different geo stationary satellite orbits with uniform speed due to gravitational force

Question # 9

State and explain Newtons law of gravitation. Also derive its equation

Ans 1: Law of gravitation: Every object in the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Ans 2: Note; we don not feel the gravitational force between different objects around us because it is very small. However we can observe the effect of gravitational force easily, if the mass of one or both objects is very large . Since the mass of earth is very large, it attracts nearby objects with a significant force. The weight of an object on the earth is a result of the gravitational fore between the two masses.

Question # 10

Q no: 6 (A) State Law of gravitation and derived the equation.

Ans 1: Everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
F x m1m2
F x 1/d²
F x m1m2/d²
F= Gm1m2/d²

Submit

Prepare Complete Set Wise Questions For Chapter 5 "9th Class Physics Chapter 5 Long Question Preparation "

Set 1

10 Questions
Start

9th Class Physics Chapter 5 Long Question Preparation - Set 1

Question # 1

Q no: 6 (B) Calculate the value of g at a height of 3600 km above the surface of the Earth.

Ans 1: Solution:
g_n =?
h = 3600km = 3600 x 1000m
R = 6400 x 10³ m
G = 6.673 x 10-¹¹ Nm²kg-²
Me = 6x 10²⁴ kg
g = GMe/R²
g_n = Gme/(R+h)²
6.673 x10-¹¹ x 6 x 10²⁴/6400 x10³ + 3600 x10³
g_n = 4ms-²

Question # 2

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

Ans 1: Solution:
Height= 850 km
= 850 x 1000m
850000m = 8.5 x 10⁵m
orbital speed = v=?
V=√GMe/(R+h)
=√6.673 x 10-¹¹ x 6 x 10²⁴/(6.4 x 10⁶ + 8.5 x 10⁵ )
= 743.13 ms-¹

Question # 3

How gravitation is discovered. what is the force of gravitation

Ans 1: The first man who came up with the idea of gravity was Isaac newton. It was an evening of 1665 when he was trying to solve the mystery why planets revolve around the sun. Suddenly an apple fell from the tree under which he was sitting. The idea of gravity flashed in his mind. he discovered not only the cause of falling apple but also the cause that makes the planet to revolve around the sun and the moon around the earth.
Force of gravitation: force due to which every body of the universe attracts every other body is called force of gravitation.

Question # 4

What do you mean by artificial satellite

Ans 1: Satellite: an object that revolves around a planet is called a satellite
Natural satellite: the moon revolves around the earth so moon is a natural satellite of the earth
Artificial; scientists have sent many objects into space. Some of these objects revolve around the earth. These are called artificial satellites.
Ans 2: Uses of artificial satellite: Most of the artificial satellites , orbiting around the earth are used for communication purpose.
Artificial satellites carry instruments or passengers to preform experiments in space. Large number of artificial satellites have been launched in different orbits around the earth.
Dish antennas sending and receiving the signals from them have fixed direction depending upon their location on the earth.

Question # 5

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

Ans 1: Solution:
Height= 850 km
= 850 x 1000m
850000m = 8.5 x 10⁵m
orbital speed = v=?
V=√GMe/(R+h)
=√6.673 x 10-¹¹ x 6 x 10²⁴/(6.4 x 10⁶ + 8.5 x 10⁵ )
= 743.13 ms-¹

Question # 6

Determine the mass of earth using Newtons law of gravitation

Ans 1: Mass of earth: the mass of earth can be calculated by using Newtons law of gravitationExplanation; consider a body of mass m is placed on the surface of the earth. The distance between the center of the body and the earth is R which is equal to radius of the earth. The mass of earth is Me.We know that the force with which the earth attracts a body on its surface towards its center is equal to the weight of the body

Question # 7

Q no: 5 (A) What ismeant by the force of gravitation? Also explain the law of gravitation.

Ans 1: everybody in the universeattracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

According to the law of gravitation the gravitationalforce of attraction F with which the two masses m1 and m2 separated by a distance `d' attract each other is given by:
F x m1m2
F x 1/d²
F x m1m2/d²
F=G m1m2/d²

Question # 8

Describe the motion of artificial satellite and derive the formula for the orbital speed of the artificial satellite

Ans 1: Artificial satellite: Artificial satellites are launched for space research and telecommunication. With their help, we are able to enjoy live coverage of cricket matches, Olympic games and many other programs directly on our television sets.
Artificial satellites keep on revolving around the earth in different geo stationary satellite orbits with uniform speed due to gravitational force

Question # 9

State and explain Newtons law of gravitation. Also derive its equation

Ans 1: Law of gravitation: Every object in the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Ans 2: Note; we don not feel the gravitational force between different objects around us because it is very small. However we can observe the effect of gravitational force easily, if the mass of one or both objects is very large . Since the mass of earth is very large, it attracts nearby objects with a significant force. The weight of an object on the earth is a result of the gravitational fore between the two masses.

Question # 10

Q no: 6 (A) State Law of gravitation and derived the equation.

Ans 1: Everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
F x m1m2
F x 1/d²
F x m1m2/d²
F= Gm1m2/d²

Submit

Physics

5th Unit

9th class Physics Chapter 5 Long Q's (English Medium)

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Matric Part 1/9th Class Physics Chapter 5 Long Question With Answer for Unit 5 Gravitation

9th Class English Medium Subjects

9th Class Urdu Medium Subjects

Online Long Questions For Chapter 5 "9th Class Physics Chapter 5 Long Question Preparation "

Physics (New Book) - 9th Class Physics Chapter 5 Long Question Preparation

Q no: 6 (B) Calculate the value of g at a height of 3600 km above the surface of the Earth.

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

How gravitation is discovered. what is the force of gravitation

What do you mean by artificial satellite

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

Determine the mass of earth using Newtons law of gravitation

Q no: 5 (A) What ismeant by the force of gravitation? Also explain the law of gravitation.

Describe the motion of artificial satellite and derive the formula for the orbital speed of the artificial satellite

State and explain Newtons law of gravitation. Also derive its equation

Q no: 6 (A) State Law of gravitation and derived the equation.

Prepare Complete Set Wise Questions For Chapter 5 "9th Class Physics Chapter 5 Long Question Preparation "

Set 1

9th Class Physics Chapter 5 Long Question Preparation - Set 1

Q no: 6 (B) Calculate the value of g at a height of 3600 km above the surface of the Earth.

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

How gravitation is discovered. what is the force of gravitation

What do you mean by artificial satellite

Q no: (B) A polar satellite is launched at 850 km above earth. Find its orbital speed.

Determine the mass of earth using Newtons law of gravitation

Q no: 5 (A) What ismeant by the force of gravitation? Also explain the law of gravitation.

Describe the motion of artificial satellite and derive the formula for the orbital speed of the artificial satellite

State and explain Newtons law of gravitation. Also derive its equation

Q no: 6 (A) State Law of gravitation and derived the equation.

9th class Physics Chapter 5 Long Q's (English Medium)

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