Gravitation Question 336

Question: The potential energy of a rock, having mass m and rotating at a height of[3.2×106m] from the earth surface, is

Options:

A) [6,,mgRe]

B) [0.67,,mgRe]

C) [0.99,,mgRe]

D) [0.33,,mgRe]

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Answer:

Correct Answer: B

Solution:

  • Mass of the [rock=m] and height of rock from earth [(h)=Re/2=3.2×106m]

    We know that gravitational potential energy of the rock rotating at height

    [h=GMemRe+h=23mgRe]

    [(where,GMe=gRe2andh=Re)]



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