JEE 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 is correct because both statements are false. The gravitational potential energy at a height R from the Earth's surface is -mgR/2, and the work done by an external agent is stored as potential energy, not wasted as heat.

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The escape velocity for a body projected vertically upwards from the surface of the earth is

11.2\mathrm{\;\;km}{\mathrm{s}^{ - 1}}

. If the body is projected in a direction making an angle of

{45^0}

with the vertical, the escape velocity will be The escape velocity of a body projected from the surface of earth is

v_e

. If the body is projected at an angle

\theta

to the horizontal surface of earth, then the escape velocity would be If different planets have the same density but different radii, then the acceleration due to gravity on the surface of the planet is related to the radius (R) of the planet as Which of the following statement is absolutely correct about mass Statement I: An astronaut in a satellite feels weightlessness:

Statement II: As observed by another astronaut's in the same satellite, force of gravity and centrifugal force balance each other. An iron ball and a wooden ball of the same radius are released from a height 'h' in vacuum. The time taken by both of them to reach the ground is