JEE PHYSICS MCQ: GRAVITATION

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If the earth rotates faster than its present speed, the weight of an object will

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Correct option: B

Decrease at the equator but remain unchanged at the poles

Option B (Decrease at the equator but remain unchanged at the poles) is correct because the effective gravitational acceleration decreases at the equator due to the increased rotational speed, while it remains unchanged at the poles.

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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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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