EASY
11th CBSE
IMPORTANT
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The earth is just an approximate sphere. If the interior contained matter which is not of the same density everywhere, then on the surface of the earth, the acceleration is due to gravity.

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Important Questions on Gravitation

EASY
11th CBSE
IMPORTANT
As observed from earth, the sun seems to move in an approximately circular orbit. For the motion of another planet like mercury as observed from earth, this would
EASY
11th CBSE
IMPORTANT
Different points in the earth are at slightly different distances from the sun and hence experience different forces owing 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 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)
EASY
11th CBSE
IMPORTANT
Satellites orbiting the earth have a finite life and sometimes debris of satellites fall to the earth. This is because,
EASY
11th CBSE
IMPORTANT
Both earth and moon are subject to the gravitational force of the sun. As observed from the sun, the orbit of the moon.
EASY
11th CBSE
IMPORTANT

Particles of masses 2M, m and M are respectively at points A, B and C, distance AB=12(BC),m<<M and at time, t=0, they are all at rest (as shown in the figure). At subsequent times before any collision takes place:

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EASY
11th CBSE
IMPORTANT
Which of the following options is correct?
HARD
11th CBSE
IMPORTANT
If the law of gravitation, instead of being inverse-square law, becomes an inverse-cube law:
MEDIUM
11th CBSE
IMPORTANT
If the mass of the sun were ten times smaller and the gravitational constant G were ten times larger in magnitudes.