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A heavy iron bar of weight W is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle θ with the horizontal. What is the weight experienced by the man?

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Important Questions on Gravitation

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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 13
The apparent weight of a body on the surface of the earth of radius R, moving with an angular speed of ω at latitude λ will be
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 14
A satellite rotating around the earth, has water in a jar kept inside it. A cork is pushed into the water in the jar and then released. The cork will
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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 15
Escape velocity from the earth's surface is
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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 16
If the earth moves round the sun in a circular orbit of radius 150000000 km with an angular velocity of about 0.01745 rad day-1. Its linear speed in km s-1 is approximately
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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 17
The escape velocity of a body on the surface of the earth is 11.2 km s-1. What is the escape velocity of the body on the surface of a planet which is 32 times as heavy as the earth and whose radius is twice the radius of the earth?
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NDA & NA EE
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 18
The ratio of the radius of the earth to that of the moon is 10. The ratio of acceleration due to gravity on the earth and on the moon is 6. The ratio of the escape velocity from the earth's surface to that from the moon is
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 19

Consider the following statements.

I. The gravitational force exerted by the sun on the moon is greater than the gravitational force exerted by the earth on the moon.

II. A heavy body falls at a faster rate than a light body in vacuum.

Which of the following statements given above is/are correct?

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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 4 - Gravitation>Practice Exercise>Q 20

Consider the following conditions in respect of an artificial satellite.

I. It should revolve in an orbit that is concentric and coplanar with the equatorial plane.

II. It should be placed at an altitude of about 36000 km from the earth.

III. Its period of revolution around the earth should be 24 h.

Which of these conditions must be satisfied by an artificial satellite in order that it becomes a geostationary satellite?