JEE PHYSICS MCQ: GRAVITATION

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Assertion: If rotation of earth about its own axis is suddenly stops then acceleration due to gravity will increase at all places on the earth.
Reason: At height

\mathrm{h}

from the surface of earth, acceleration due to gravity is

\mathrm{g}_{\mathrm{h}}=\mathrm{g}\left(1-\frac{2 \mathrm{h}}{\mathrm{R}_{\mathrm{e}}}\right)

View answer and explanation

Correct option: D

If both Assertion & Reason are false

Option D (If both Assertion & Reason are false) is correct because the assertion is false as gravity only increases at the equator, and the reason provides an incorrect formula for gravity at height h.

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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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