HARD
11th West Bengal Board
IMPORTANT
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What is velocity of escape? Derive its expression. Explain why the earth's atmosphere does not contain lighter gases like hydrogen and helium and moon has no atmosphere?

Important Questions on Gravitation

HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 15
Derive the relation between the valocity of escape and the orbital velocity of a satellite revolving very near to the earth's surface. Express velocity of escape in term's of mean density of the earth.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 16
Explain why everything in a revolving satellite is weightless. Explain why we do not feel the gravitational attraction of sun, though it is indeed a large force.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 17
What is geostationary satellite ? What is parking orbit? Calculate its height from the surface of the earth. Explain clearly how a satellite is set into the parking orbit. State some uses of such a satellite.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 18
What is polar satellite? State some of its uses.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 19
A planet or a satellite is revolving round the sun or earth. Calculate its kinetic, potential and total energy. Explain the significance of these values. Draw graphs to show the variations of these with distance r from the sun or the earth. Explain the curves.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 1
The force with which a sphere of mass 40 kg attracts another sphere of mass 15 kg placed 20 cm away from its centre is 1 mg-wt. Find, from these, the value of the gravitational constant.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 2
At what altitude from the centre of the earth will the acceleration due to gravity be 116th of its value on the surface of the earth? Assume the earth to be a sphere of 6300 km radius.
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 11 - Gravitation>EXERCISE>Q 3
At what altitude and at what depth from the surface of the earth will the acceleration due to gravity be half that of its value on the surface? Radius of the earth=6300 km .