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JEE PHYSICS MCQ: GRAVITATION

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One can easily “weight the earth” by calculating the mass of earth using the formula (in usual notation)

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Correct option: B

\frac{g}{G}R_E^2

Option B is correct because the mass of the Earth can be found using the formula derived from equating gravitational force and weight.

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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