NEET UG PHYSICS MCQ: GRAVITATION

1 Easy

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Statement-1: Two particles are to be projected from the surface of earth so that particles just leave the gravitational field of earth. One particle is projected vertically upward and another is at an angle of

45^{\circ}

with vertical. Speed given to both particles is same.
Statement-2: Escape speed does not depend upon angle of projection.

View answer and explanation

Correct option: A

Statement-1 is true, Statement-2 is true

Option A (Statement-1 is true, Statement-2 is true) is correct because escape speed is independent of the angle of projection, and thus the same speed will allow both particles to escape.

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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.