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Quiz 2
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which is these are the laws of Kepler?
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The cube of the mean distance of a planet from the sun is directly proportional to the square of time it takes to move around the sun
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Each planet revolves around the sun in such a way that the line joining the planet to the sun sweeps over equal areas in equal interval of time
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The planets move in the elliptical orbits around the sun with sun situated on one of the foci of the elliptical orbit
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All the above
What is true of g?
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it is vector quantity and has unit m/s2
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it is scalar quantity and has unit m/s2
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it is vector quantity and has unit m/s
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it is scalar quantity and has unit m/s
The value of g at three places A,B,C which are above the surface of the earth are in the following order A > B > C what can be said about the distance of these places from the surface of the earth
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A > B > C
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A=B=C
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C> B> A
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None of the above
There are two statements A The weight of the body is not constant and it changes with acceleration due to gravity B The mass of the objects can never be zero Which one of the following is correct?
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A only
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B only
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Both A and B are correct
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Both A and B are incorrect
Two bodies fall from the same height on the surface of the earth ? Which body will strike the surface first
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Heavier body
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lighter body
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Both will reach same at the same time
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none of these
Why will a sheet of paper fall slower than one that is crumpled into a ball?
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The sheet of paper experience more air resistance then crumpled one
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The crumpled one will have more gravitational force then sheet of paper
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None of these
Two objects A and B are of mass m1 and m2 are separated by the distance r. The Gravitational force between the objects is F What will be Gravitational Force between the two objects if the mass of the one object is doubled
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F/4
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2F
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F/2
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4F
What will be Gravitational Force between the two objects if distance is increased two times?
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F/4
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2F
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F/2
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4F
What will be Gravitational Force between the two objects if distance is increased two times and both the masses are doubled?
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F/4
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2F
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F/2
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F
A ball is thrown vertically upwards with a velocity of 49 m/s and g =9.8 m/s2 Calculate the max height it rises up to?
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112.5 m
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245 m
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122.5 m
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none of these
Calculate the total time it takes to reach back to surface?
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20 sec
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15 sec
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5 sec
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10 sec
A coin and a feather are dropped together in a vacuum.
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The coin will reach the ground first.
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The feather will reach the ground first.
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Both will reach the ground together.
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The feather will not fall down.
Consider a heavenly body that has mass \(2M_e\) and radius \(2R_e\), where \(M_e\) and \(R_e\) are the mass and the radius of the earth respectively. The acceleration due to gravity at the surface of this heavenly body is
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\(2.45m/{s^2}\)
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\(4.9m/{s^2}\)
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\(9.8m/{s^2}\)
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\(19.6m/{s^2}\)
Newton’s law of gravitation is valid
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on the earth only
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on the moon only
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in the laboratory only
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everywhere
The value of G on the moon is about one-sixth of its value on the earth.
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True
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False
Newton's law of gravitation follows from Newton's laws of motion
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True
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False
The universal constant of gravitation G has the unit
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\(N\)
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\(m/s\)
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\((Nm^2)/Kg^2\)
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\(J\)
The force of gravitation between two bodies of mass 1 kg each kept at a distance of 1 m is
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\(6.67N\)
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\(6.67\times 10^{-9}\)
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\(6.67\times 10^{-7}\)
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\(6.67\times 10^{-11}N\)
Mass and weight are measured in different units.
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True
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False
Two particles are kept at a distance \(r\). The gravitational force between them is proportional to
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\(r\)
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\(r^2\)
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\( \frac{1}{r}\)
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\( \frac{1}{r^2}\)
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