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] $
