NEET UG PHYSICS MCQ: GRAVITATION

1 Easy

1 of 1

Understanding +4 | -1

I. The geo-stationary satellite always has circular orbit.
II. The time period of satellite depends on mass of the satellite, mass of the earth and height of satellite from the surface of earth.
Which of the following statement(s) is/are incorrect?

View answer and explanation

Correct option: A

Only I

Only I is incorrect. A geostationary satellite's orbit can be elliptical, though it's usually close to circular. The time period does depend on the mass of the earth and the height of the satellite.

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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.