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JEE PHYSICS MCQ: GRAVITATION

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The radius of a planet is twice the radius of earth. Both have almost equal average mass-densities. If

V_P

and

V_E

are escape velocities of the planet and the earth, respectively, then

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Correct option: B

V_P=2 V_E

Option B (

V_P=2 V_E

) is correct because the escape velocity is directly proportional to the radius when the average mass-densities are equal.

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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

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