The radius of orbit of a planet is two times that of the earth. The time period of the planet is:

(1)   4.2 years                          

(2)   2.8 years

(3)   5.6 years                          

(4)   8.4 years

Subtopic:  Kepler's Laws |
 80%
From NCERT
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The diagram showing the variation of gravitational potential of earth with distance r from the centre of earth is -

Subtopic:  Gravitational Potential | Gravitational Potential Energy |
 51%
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The orbital angular momentum of a satellite revolving at a distance \(r\)from the centre is \(L\). If the distance is increased to 16r, then the new angular momentum will be:

1. \(16~L\) 2. \(64~L\)
3. \(L \over 4\) 4. \(4~L\)
Subtopic:  Satellite |
From NCERT
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The condition for a uniform spherical mass m of radius r to be a black hole is [G= gravitational constant and g= acceleration due to gravity] .

(1) 2Gm/r1/2c                

(2) 2Gm/r1/2=c 

(3) 2Gm/r1/2c                

(4)  gm/r1/2c

Subtopic:  Escape velocity |
 75%
From NCERT
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A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0r)

Subtopic:  Gravitational Field |
From NCERT
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Which one of the following graphs represents correctly the variation of the gravitational field (I) with the distance (r) from the centre of a spherical shell of mass M and radius a ?

Subtopic:  Gravitational Field |
 69%
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Suppose, the acceleration due to gravity at the earth’s surface is 10 m/s2 and at the surface of Mars, it is 4.0 m/s2. A 60 kg passenger goes from the earth to Mars in a spaceship moving with a constant velocity. Neglect all other objects in the sky. Which part of the figure best represents the weight (net gravitational force) of the passenger as a function of time ?

(a) A                              (b) B

(c) C                              (d) D

 

Subtopic:  Gravitational Field |
 65%
From NCERT
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Which of the following graphs represents the motion of a planet moving about the sun ?

Subtopic:  Kepler's Laws |
 77%
From NCERT
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The correct graph representing the variation of total energy (Et), kinetic energy (Ek) and potential energy (U) of a satellite with its distance from the centre of the earth is -

Subtopic:  Gravitational Potential Energy |
 75%
From NCERT
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What is the intensity of gravitational field of the centre of a spherical shell?

(1)     Gm/r2           

(2)    g

(3)      Zero             

(4)    None of these

Subtopic:  Gravitational Field |
 89%
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