Gravitation Question 320

Question: A particle is suspended from a spring and it stretches the spring by 1 cm on the surface of earth. By how much amount the same particle will stretch the same spring at a place 800 km above the surface of earth.

Options:

A) 1.59 cm

B) 2.38 cm

C) 0.79 cm

D) 1.38 cm

Show Answer

Answer:

Correct Answer: C

Solution:

  • $ [x={m _g}{K} = \frac{GMm}{R^2}$

    $ k\Rightarrow x \propto \frac{1}{R^{2}}\Rightarrow x _{2}] $ $ [={{\left( \frac{6400}{7200} \right)}^{2}}x _{1}=0.79cm] $



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