JEE PHYSICS MCQ: GRAVITATION

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Analyzing +4 | -1

A rocket is intended to leave the Earth’s gravitational field. The
fuel in its main engine is a little less than the amount that is
necessary and an auxiliary engine, (only capable of operating
for a short time) has to be used as well. When is it best to switch
on: the auxiliary engine?

View answer and explanation

Correct option: A

At take-off

Option A (At take-off) is correct because the auxiliary engine should provide maximum energy at the start to overcome Earth's gravitational field most effectively.

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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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