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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 Suns pull is greater than the moons pull. (you can check this yourself using the data available in the succeeding exercises)....
However, the tidal effect of the moons pull is greater than the tidal effect of sun. Why ??? give reason...
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Asked by Sabre Queen No. 1
Answers
Heya mate you answers :-
( 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 ?
Answer :-
➠ No, gravitational force is a long range force and we cannot escape from it.
The gravitational forces are not depend upon the nature of the medium , but the electric force depends on the intervening medium between the charge and the charge and the electric field . So we cannot shield a body from the gravitational force.
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( 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 ?
Answer :-
( There is two answer , which you find better you can write )
➛ Due to the small space ship, the force of attraction between the earth and the ship is too less, the astronaut cannot detect gravity. If the size of the space station is very large, the magnitude of the gravity will also become appreciable and hence he can hope to detect it.
➛ An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. ... Yes, if the size of space-station orbiting around the earth is very large, then the astronaut inside the spaceship will experience gravitational force and hence can detect gravity.
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( 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 Suns pull is greater than the moons pull ?
Answer :-
➢ Tidal effect is inversely proportional to the cube of the distance while gravitational force is inversely proportional to the square of the distance.
Generally, the gravitational force of attraction between two bodies is directly proportional to their masses and inversely proportional to the square of the distance between them. The gravitational force between the sun and the earth or between the moon and the earth varies inversely to the square of the distance. But due to the very large mass of the sun, the gravitational force on the earth due to the sun is about 7x10 times the force due to the moon on it.
The tidal effect varies inversely as the cube of the distance. Therefore, though the mass of the moon is quite small as compared to the mass of the sun, yet the tidal effect of moon's pull is very large (as compared to that due to the sun) due to small distance between moon and earth.
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➪ However, the tidal effect of the moons pull is greater than the tidal effect of sun. Why ??? give reason... ?¿
Answer => Even though the sun is much more massive and therefore has stronger overall gravity than the moon, the moon is closer to the earth so that its gravitational gradient is stronger than that of the sun.
- Thankyou : )
Answer:
c= tidal effect of moon is greater than sun because the moon is closer earth so it's gravitational gradient is stronger than that of sun .so that's why moon tidal force is greater than tidal force of sun