The planet Mars has two moons, Phobos and Delmos. Phobos has a period of $$7$$ hours, $$39$$ minutes and an orbital radius of $9.4×{10}^{3}$ km. The mass of mars is:
1.
2.
3.
4.

Subtopic:  Satellite |
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Assume that a space shuttle flies in a circular orbit very close to the earth's surface. Taking the radius of the space shuttle's orbit to be equal to the radius of the earth ($$R$$) and the acceleration due to gravity to be $$g$$, the time period of one revolution of the space shuttle is (nearly):

 1 $$\sqrt\frac{2R}{g}$$ 2 $$\sqrt\frac{\pi R}{g}$$ 3 $$\sqrt\frac{2\pi R}{g}$$ 4 $$\sqrt\frac{4\pi^2 R}{g}$$
Subtopic:  Satellite |
69%
From NCERT
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The radii of circular orbits of two satellites A and B of the earth are $$4R$$ and $$R$$ respectively. If the speed of satellite A is $$3v,$$ then the speed of satellite B will be:
1. $$3v/4$$
2. $$6v$$
3. $$12v$$
4. $$3v/2$$

Subtopic:  Satellite |
58%
From NCERT
AIPMT - 2010
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For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is:
1. $\frac{1}{\sqrt{2}}$
2. $$2$$
3. $\sqrt{2}$
4. $\frac{1}{2}$

Subtopic:  Satellite |
81%
From NCERT
AIPMT - 2005
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The time period of an earth satellite in circular orbit is independent of:

 1 the mass of the satellite 2 radius of the orbit 3 none of them 4 both of them
Subtopic:  Satellite |
78%
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Two satellites A and B move around the earth in the same orbit. The mass of B is twice the mass of A. Then:

 1 speeds of A and B are equal. 2 the potential energy of earth $$+$$ A is same as that of earth $$+$$ B. 3 the kinetic energy of A and B are equal. 4 the total energy of earth $$+$$ A is same as that of earth $$+$$ B.

Subtopic:  Satellite |
68%
From NCERT
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