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How is the gravitational force between two point masses affected when they are dipped in water keeping the separation between them the same?

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प्रश्न

How is the gravitational force between two point masses affected when they are dipped in water keeping the separation between them the same?

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उत्तर

The gravitational force is unaffected by the medium, and it remains the same between the point masses irrespective of their surrounding. Therefore, when the two-point masses are dipped in water, the gravitational force between them remains the same.

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पाठ 8: Gravitation - Exercises [पृष्ठ ६१]

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एनसीईआरटी एक्झांप्लर Physics Exemplar [English] Class 11
पाठ 8 Gravitation
Exercises | Q 8.21 | पृष्ठ ६१

संबंधित प्रश्‍न

Write the answer of the question with reference to laws of gravitation.

State the universal law of gravitation.


State Kepler’s law which is represented by the relation r3 ∝ T2.


Which of the Kepler’s laws of planetary motion led Newton to establish the inverse-square rule for gravitational force between two bodies ?


A person sitting in a chair in a satellite feels weightless because


A particle of mass 100 g is kept on the surface of a uniform sphere of mass 10 kg and radius 10 cm. Find the work to be done against the gravitational force between them to take the particle away from the sphere.


Explain the following:

People often shake the branches of a tree for getting down its fruits.


Distinguish between gravity and gravitation


What does a force do in the following case?
You twist a piece of rubber.


Two equal and opposite forces acting at the same point on a stationary body. Will the body move? Give reason to explain your answer.


Gravity is another kind of ________. It exerts all through the ________. The Sun's gravity keeps the ___________ in their orbits. Gravity can only be felt with very large ________.


Explain the difference between g and G.


State Newton's law of gravitation. What is the difference between:
Gravity and gravitation


The distance-time values for an object moving along straight line are given below:

Time (s) Distance (m)
0 0
1 1
2 8
3 27

 


Show that gravity decreases at higher altitudes.


Solve the following problem.

Calculate the acceleration due to gravity at a height of 300 km from the surface of the Earth. (M = 5.98 × 1024 kg, R = 6400 km).


The ______ force is much weaker than other forces in nature.


State the universal law of gravitation and derive its mathematical expression.


For the weight of body of mass 5 kg to be zero on equator of the earth, angular velocity of the earth must be (The radius of earth = 6400 km, acceleration due to gravity = 10 m/s2).


Different points in earth are at slightly different distances from the sun and hence experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the c.m. (centre of mass) causing translation and a net torque at the c.m. causing rotation around an axis through the c.m. For the earth-sun system (approximating the earth as a uniform density sphere).


If the law of gravitation, instead of being inverse-square law, becomes an inverse-cube law- ______.

  1. planets will not have elliptic orbits.
  2. circular orbits of planets is not possible.
  3. projectile motion of a stone thrown by hand on the surface of the earth will be approximately parabolic.
  4. there will be no gravitational force inside a spherical shell of uniform density.

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