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We know that both Moon and the sun produ...

We know that both Moon and the sun produce our ocean tides. We also know that moon plays the greater role because it is closer. Does its closeness mean it pulls with more gravitational force than the sun on the Earth's oceans?

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To determine whether the closeness of the Moon means it pulls with more gravitational force than the Sun on the Earth's oceans, we need to analyze the gravitational forces involved. ### Step-by-Step Solution: 1. **Understanding Gravitational Force**: The gravitational force \( F \) between two masses \( m_1 \) and \( m_2 \) separated by a distance \( r \) is given by Newton's law of gravitation: \[ F = G \frac{m_1 m_2}{r^2} ...
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Answer the following: a) The casing of a rocket in flight burns up due to friction. At whose expense is the heat required for burning obtained? The rocket or the atmosphere? b) Comets move around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet's velocity in general. Yet the work done by the gravitatonal force over every complete orbit of the comet is zero. Why? c) An artificial satellite orbiting the earth in very atmosphere loses its energy grdually due to dissipation against atmospheric resistance, howerver small. Why then does its speed increase progressively as it comes closer and closer tothe earth? d)In fig i) the man walks 2m carrying a mass of 15 kg on his hands. In Fig ii) he walks the same distance pulling the rope behind him. The rope goes over pulley, and a mass of 15 kg hangs at its other end. In which case is the work done greater?

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 spaceship 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. (You can check this yourself using the data available in the succeeding exercises). However, the tidal effect of the Moon’s pull is greater than the tidal effect of Sun. Why?

The earth revolves round the sun because the sun attracts the erth. The sun also attracts the moon and this force is about twice as large as the attraction of the earth on the mon. Why does the moon not revolve round the sun? Or does it?

Assertion : On earth's satellite, we feel weightlessness. Moon is also satellite of earth. But on the surface on moon, we do not feel weightlessness Reason : Gravitational force by earth on us on the surface of moon is zero. But gravitational force by moon on us on its surface is non-zero.

PRADEEP-GRAVIATION-CONCEPTUAL PROBLEMS
  1. For particles of equal masses M that move along a circle of radius R u...

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  2. Three uniform spheres each having a mass M and radius a are kept in su...

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  3. We know that both Moon and the sun produce our ocean tides. We also kn...

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  4. Two identical copper spheres of radius R are in contact with each othe...

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  5. Under what conditions can the electric flux phiE be found through a cl...

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  6. Assertion : We can not move even a finger without disturbing all the s...

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  7. We are living at the bottom of the gravitational well. Comment.

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  8. What would happen if gravity suddenly disappears?

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  9. The distance between two bodies A and B is r. Taking the gravitational...

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  10. Where will a body weigh more, 2 km above the surface of earth or 2 km ...

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  11. The mass and diameter of a planet are twice those of earth. What will ...

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  12. Will 1 kg sugar be more at poles or at the equator?

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  13. Since the Moon is gravitational attracted to the Earth, why does it no...

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  14. A body is taken from the centre of the Earth to the Moon. What will be...

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  15. Three equal masses m are placed at the three corners of an equilateral...

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  16. What is the potential energy of a body of mass m relative of the surfa...

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  17. The magnitude of the gravitational field at distance r(1) and r(2) fro...

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  18. In a certain region of space gravitational field is given by I = - (k/...

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  19. A spherical cavity is made inside a sphere of density, d. Its centre l...

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  20. The magnitude of the gravitational field at distance r(1) and r(2) fro...

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