NEET UG PHYSICS MCQ: GRAVITATION

1 Easy

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Analyzing +4 | -1

Statement-1: A particle is at a height

{R}

from the surface of earth (Here

{R}

is radius of earth). If mass of particle is

{m}

then its gravitational potential energy is

{mgR}

Statement-2: If a particle is slowly lifted above the surface of earth then work is done by external agent. Work done by external agent is wasted in the form of heat energy.

View answer and explanation

Correct option: D

Statement-1 is false, Statement-2 is false

Option D (Statement-1 is false, Statement-2 is false) is correct because gravitational potential energy at height R is -GMm/2R, and work done by the external agent is stored as potential energy, not wasted as heat.

More Questions from GRAVITATION

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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.