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Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

The earth is an approximate sphere. If the interior contained matter which is not of the same density... read more

The earth is 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 due to gravity
(a) ‘ will be directed towards the centre but not the same every where
(b) will have the same value everywhere but not directed towards the centre
(c) will be same everywhere in magnitude directed towards the centre
(d) cannot be zero at any point read less

Answer

Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

If the law of gravitation, instead of being inverse square law, becomes an inverse cube law(a) planets... read more
If the law of gravitation, instead of being inverse square law, becomes an inverse cube law
(a) planets will not have elliptic orbits
(b) circular orbits of planets is not possible
(c) projectile motion of a stone thrown by hand on the surface of the earth will be approximately parabolic
(d) there will be no gravitational force inside a spherical shell of uniform density read less

Answer

Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

If the mass of the sun were ten times smaller and gravitational constant G were ten times larger in magnitude.... read more
If the mass of the sun were ten times smaller and gravitational constant G were ten times larger in magnitude. sun Then,
(a) walking on ground would become more difficult
(b) the acceleration due to gravity on the earth will not change
(c) raindrops will fall much faster
(d) airplanes will have to travel much faster
ncert-exemplar-problems-class-11-physics-chapter-7-gravitation-12 read less

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Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

If the sun and the planets carried huge amounts of opposite charges,(a) all three of Kepler’s laws... read more
If the sun and the planets carried huge amounts of opposite charges,
(a) all three of Kepler’s laws would still be valid
(b) only the third law will be valid
(c) the second law will not change
(d) the first law will still be valid read less

Answer

Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

Is it possible for a body to have inertia but no weight?

Answer

Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

We can shield a charge from electric fields by putting it inside a hollow conductor. Can we shield a... read more
We can shield a charge from electric fields by putting it inside a hollow conductor. Can we shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? read less

Answer

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Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

An astronaut inside a small spaceship orbiting around the earth cannot detect gravity. If the space station... read more
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? read less

Answer

Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

A mass m is placed at P a distance h along the normal through the centre O of a thin circular ring of... read more
A mass m is placed at P a distance h along the normal through the centre O of a thin circular ring of mass M and radius r (figure).
If the mass is moved further away such that OP becomes 2h, by what factor the force of gravitation will decrease, if h = r?
ncert-exemplar-problems-class-11-physics-chapter-7-gravitation-38 read less

Answer

Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

A star like the sun has several bodies moving around it at different distances. Consider that all of... read more
A star like the sun has several bodies moving around it at different distances. Consider that all of them are moving in circular orbits. Let r be the distance of the body from the centre of the star and let its linear velocity be v, angular velocity to, kinetic energy K, gravitational potential energy U, total energy E and angular momentum /. As the radius r of the orbit increases, determine which of the above quantities increase and which ones decrease. read less

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Asked on 25 Sep CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

Six point masses of mass m each are at the vertices of a regular hexagon of side l. Calculate the force... read more
Six point masses of mass m each are at the vertices of a regular hexagon of side l. Calculate the force on any of the masses. read less

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