A satellite is moving very close to a planet of density \(\rho.\) The time period of the satellite is:
1. \(\sqrt{\frac{3 \pi}{ρG}}\)
2. \(\left(\frac{3 \pi}{ρG}\right)^{3 / 2}\)
3. \(\sqrt{\frac{3 \pi}{2 ρG}}\)
4. \(\left(\frac{3 \pi}{2 ρG}\right)^{3 / 2}\)

Subtopic:  Satellite |
 59%
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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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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.  -5Gmr

2.  -6Gmr

3.  -9Gmr

4.  0

Subtopic:  Gravitational Field |
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The satellite of mass m orbiting around the earth in a circular orbit with a velocity v. The total energy will be:

1.  34mv2

2.  12mv2

3.  -12mv2

4.  mv2

Subtopic:  Gravitational Potential Energy | Escape velocity |
 77%
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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 |
 83%
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Weightlessness experienced while orbiting the earth in a space-ship is the result of:

1. Inertia                        
2. Acceleration
3. Zero gravity
4. Freefall towards the earth

Subtopic:  Satellite |
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The escape velocity for a rocket from the earth is \(11.2\) km/s. Its value on a planet where the acceleration due to gravity is double that on the earth and the diameter of the planet is twice that of the earth (in km/s) will be:

1. \(11.2\) 2. \(5.6\)
3. \(22.4\) 4. \(53.6\)
Subtopic:  Escape velocity |
 78%
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If g is the acceleration due to gravity at the earth's surface and r is the radius of the earth, the escape velocity for the body to escape out of the earth's gravitational field is:

1. gr                                       

2. 2gr

3. g/r                                       

4. r/g

Subtopic:  Escape velocity |
 95%
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The escape velocity of a particle of mass m varies as:

1. m2                                   

2. m

3. m0                                   

4. m-1

Subtopic:  Escape velocity |
 80%
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