# The gravitational potential difference between the surface of a planet and 10 m above is 5 J/kg. If the gravitational field is supposed to be uniform, the work done in moving a 2 kg mass from the surface of the planet to a height of 8 m is 1.  2J 2.  4J 3.  6J 4.  8J

Subtopic:  Gravitational Potential |
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A planet is moving in an elliptical orbit. If T, V, E, and L stand, respectively, for its kinetic energy, gravitational potential energy, total energy and angular momentum about the center of the orbit, then

1.  T is conserved

2.  V is always positive

3.  E is always negative

4.  the magnitude of L is conserved but its direction changes continuously

Subtopic:  Satellite |
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In planetary motion, the areal velocity of the position vector of a planet depends on the angular velocity ($\omega$) and the distance of the planet from the sun (r). The correct relation for areal velocity is:

1.

2.

3.

4.

Subtopic:  Kepler's Laws |
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If A is the areal velocity of a planet of mass M, its angular momentum is

1.  $\frac{\mathrm{M}}{\mathrm{A}}$

2.  2MA

3.  ${\mathrm{A}}^{2}M$

4.  ${\mathrm{AM}}^{2}$

Subtopic:  Kepler's Laws |
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Two bodies of masses m and 4m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is

1.  $-\frac{5\mathrm{Gm}}{\mathrm{r}}$

2.  $-\frac{6\mathrm{Gm}}{\mathrm{r}}$

3.  $-\frac{9\mathrm{Gm}}{\mathrm{r}}$

4.  0

Subtopic:  Gravitational Field |
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Magnitude of potential energy (U) and time period (T) of a satellite are related to each other as:

1.

2.

3.

4.

Subtopic:  Satellite |
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A projectile fired vertically upwards with a speed v escapes from the earth. If it is to be fired at 45$°$ to the horizontal, what should be its speed so that it escapes from the earth?

1.  v

2.  $\frac{\mathrm{v}}{\sqrt{2}}$

3.  $\sqrt{2}\mathrm{v}$

4.  2v

Subtopic:  Escape velocity |
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Kepler's second law regarding constancy of the areal velocity of a planet is a consequence of the law of conservation of:

(1) Energy

(2) Linear momentum

(3) Angular momentum

(4) Mass

Subtopic:  Kepler's Laws |
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A point P lies on the axis of a ring of mass M and radius 'a' at a distance 'a' from its centre C. A small particle starts from P and reaches C under gravitational attraction. Its speed at C will be :

1. $\sqrt{\frac{2\mathrm{GM}}{\mathrm{a}}}$

2. $\sqrt{\frac{2\mathrm{GM}}{\mathrm{a}}\left(1-\frac{1}{\sqrt{2}}\right)}$

3. $\sqrt{\frac{2\mathrm{GM}}{\mathrm{a}}\left(\sqrt{2}-1\right)}$

4. zero

Subtopic:  Gravitational Potential Energy |
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A projectile is fired upwards from the surface of the earth with a velocity ${\mathrm{kv}}_{\mathrm{e}}$ where ${\mathrm{v}}_{\mathrm{e}}$ is the escape velocity and k < 1. If r is the maximum distance from the center of the earth to which it rises and R is the radius of the earth, then r equals

1.  $\frac{\mathrm{R}}{{\mathrm{k}}^{2}}$

2.

3.

4.

Subtopic:  Escape velocity |
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