The gravitational field due to a mass distribution is given by I= kx2i^, where k is a constant. Assuming the potential to be zero at infinity, find the potential at a point x = a.[This question includes concepts from Gravitation chapter]

1. ka2

2. -ka2

3. ka

4. -ka

Subtopic:  Gravitational Potential |
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The work done to raise a mass \(m\) from the surface of the earth to a height \(h\), which is equal to the radius of the earth, is:
1. \(\dfrac{3}{2}mgR\)
2. \(mgR\)
3. \(2mgR\)
4. \(\dfrac{1}{2}mgR\)  
Subtopic:  Gravitational Potential Energy |
 65%
From NCERT
NEET - 2019
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A body weighs \(200\) N on the surface of the earth. How much will it weigh halfway down the centre of the earth?

1. \(100\) N 2. \(150\) N
3. \(200\) N 4. \(250\) N
Subtopic:  Acceleration due to Gravity |
 80%
From NCERT
NEET - 2019
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The earth is assumed to be a sphere of radius \(R\). A platform is arranged at a height \(R\) from the surface of the earth. The escape velocity of a body from this platform is \(fv_e\), where \(v_e\) is its escape velocity from the surface of the earth. The value of \(f\) is:
1. \(\sqrt{2}\)
2. \(\frac{1}{\sqrt{2}}\)
3. \(\frac{1}{3}\)
4. \(\frac{1}{2}\)

Subtopic:  Escape velocity |
 68%
From NCERT
AIPMT - 2006
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Two satellites of Earth, \(S_1\), and \(S_2\), are moving in the same orbit. The mass of \(S_1\) is four times the mass of \(S_2\). Which one of the following statements is true?

1. The time period of \(S_1\) is four times that of \(S_2\).
2. The potential energies of the earth and satellite
in the two cases are equal.
3. \(S_1\) and \(S_2\) are moving at the same speed.
4. The kinetic energies of the two satellites are equal.

Subtopic:  Satellite |
 68%
From NCERT
AIPMT - 2007
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The figure shows the elliptical orbit of a planet \(m\) about the sun \(\mathrm{S}.\) The shaded area \(\mathrm{SCD}\) is twice the shaded area \(\mathrm{SAB}.\) If \(t_1\) is the time for the planet to move from \(\mathrm{C}\) to \(\mathrm{D}\) and \(t_2\) is the time to move from \(\mathrm{A}\) to \(\mathrm{B},\) then:
           

1. \(t_1>t_2\) 2. \(t_1=4t_2\)
3. \(t_1=2t_2\) 4. \(t_1=t_2\)


Subtopic:  Kepler's Laws |
 72%
From NCERT
AIPMT - 2009
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A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force:

1. is greatest at the instant just before the body hits the earth.
2. remains constant throughout.
3. is greatest at the instant just after the body is projected.
4. is greatest at the highest position of the body.

Subtopic:  Acceleration due to Gravity |
 59%
From NCERT
AIPMT - 2011
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A spherical planet has a mass \(M_p\) and diameter \(D_p\). A particle of mass \(m\) falling freely near the surface of this planet will experience acceleration due to gravity equal to:
1. \(\frac{4GM_pm}{D_p^2}\)
2. \(\frac{4GM_p}{D_p^2}\)
3. \(\frac{GM_pm}{D_p^2}\)
4. \(\frac{GM_p}{D_p^2}\)

Subtopic:  Newton's Law of Gravitation |
 74%
From NCERT
AIPMT - 2012
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An infinite number of bodies, each of mass \(2\) kg are situated on the \(x\text-\)axis at distances \(1 m, ~2m, ~4m, ~8m, \ldots \ldots .\)respectively, from the origin. The resulting gravitational potential due to this system at the origin will be:
1.  \(-\frac{8}{3}{G}\) 2. \(-\frac{4}{3} {G}\)
3.  \(-4 {G}\) 4. \(-{G}\)
Subtopic:  Gravitational Potential |
 70%
From NCERT
AIPMT - 2013
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A body of mass \(m\) is taken from the Earth’s surface to the height equal to twice the radius \((R)\) of the Earth. The change in potential energy of the body will be: 

1. \(\frac{2}{3}mgR\) 2. \(3mgR\)
3. \(\frac{1}{3}mgR\) 4. \(2mgR\)
Subtopic:  Gravitational Potential Energy |
 76%
From NCERT
AIPMT - 2013
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