NEET UG PHYSICS MCQ: GRAVITATION

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Two satellites of mass 400 kg and 600 kg revolve around the earth is circular orbits of radii 10 R and 20 R respectively where R is the radius of the earth the speed of the two satellites will be in the ratio

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Correct option: C

\sqrt 2 :1

Option C (

\sqrt 2 :1

) is correct because the orbital speed is independent of the mass of the satellite and inversely proportional to the square root of the radius.

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If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force

\left( { - K/{r^2}} \right)

the total energy is Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e.

F \propto \frac{1}{r^3}

, but still remaining a central force. Then Two satellites A and B go round a planet P is circular orbits having radii 16 R and 2 R respectively. If the speed of satellite A is

6\,m{s^{ - 1}}

the speed of the satellite B will be [in m/s] nearly The total energy of satellite moving with an orbital velocity

v

around the earth is Two satellites of same mass are launched in the same orbit of radius

r

around the earth so as to rotate opposite to each other. If they collide inelastically and stick together as wreckage, the total energy of the system just after collision is Statement-1: There is almost no effect of rotation of earth at poles.
Statement-2: Because rotation of earth is about polar axis.