NEET UG PHYSICS MCQ: GRAVITATION

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Analyzing +4 | -1

Assertion: The work done to project a body of mass

m

from the earth's surface (radius

R

) to infinity is

m g R

.

Reason: The required work done is equal to change in potential energy of the mass, which is equal to

G M m / R

View answer and explanation

Correct option: A

If both assertion and reason are true and reason is the correct explanation of the assertion.

Option A (If both assertion and reason are true and reason is the correct explanation of the assertion) is correct because the work done equals the change in potential energy from the surface to infinity.

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.