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Asked on 25/09/2018 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

Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

As observed from the earth, the sun appears to move in an approximate circular orbit. For the motion... read more
As observed from the earth, the sun appears to move in an approximate circular orbit. For the motion of another planet like mercury as observed from the earth, this would
(a) be similarly true
(b) not be true because the force between the earth and mercury is not inverse square law
(c) not be true because the major gravitational force on mercury is due to the sun
(d) not be true because mercury is influenced by forces other than gravitational forces read less

Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

Different points in the earth are at slightly different distances from the sun and hence experience different... read more
Different points in the 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 CM (centre of mass) causing translation and a net torque at the CM causing rotation around an axis through the CM. For the earth-sun system (approximating the earth as a uniform density sphere)
(a) the torque is zero
(b) the torque causes the earth to spin
(c) the rigid body result is not applicable since the earth is not even approximately a rigid body
(d) the torque causes the earth to move around the sun read less

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Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

Satellites orbiting the earth have finite life and sometimes debris of satellites fall to the earth.... read more
Satellites orbiting the earth have finite life and sometimes debris of satellites fall to the earth. This is because
(a) the solar cells and batteries in satellites run out
(b) the laws of gravitation predict a trajectory spiralling inwards
(c) of viscous forces causing the speed of satellite and hence height to gradually decrease
(d) of collisions with other satellites read less

Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

The centre of mass of an extended body on the surface of the earth and its centre of gravity (a) are... read more
The centre of mass of an extended body on the surface of the earth and its centre of gravity
(a) are always at the same point for any size of the body
(b) are always at the same point only for spherical bodies
(c) can never be at the same point
(d) is close to each other for objects, say of sizes less than 100 m
(e) both can change if the object is taken deep inside the earth read less

Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

Molecules in air in the atmosphere are attracted by gravitational force of the earth. Explain why all... read more
Molecules in air in the atmosphere are attracted by gravitational force of the earth. Explain why all of them do not fall into the earth just like an apple falling from a tree. read less

Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

Give one example each of central force and non-central force.

Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

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

Asked on 25/09/2018 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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Asked on 25/09/2018 CBSE/Class 9/Science/Unit 3-Motion, Force and Work/Gravitation

If mean angular velocity co corresponds to 1° per day, then p = 1.034° per day and a = 0.967°... read more
If mean angular velocity co corresponds to 1° per day, then p = 1.034° per day and a = 0.967° per day.
Since, 361° = 24 mean solar day we get (360 + 1.034) which corresponds to 24 h, 8.14″ (8.1″ longer) and 360.967°, corresponds to 23 h 59 min 52″ (7.9″ smaller).
This does not explain the actual variation of the length of the day during the year.
[G = 6.67 x 10-11 SI unit and M= 6 x 1024 kg]

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