Gravitation Question 275

Question:If $ [g\propto \frac{1}{R^{3}}] $ (instead of $ [\frac{1}{R^{2}}),] $ then the relation between time period of a satellite near earth’s surface and radius R will be[RPMT 2002]

Options:

A) $ [T^{2}\propto R^{3}] $

B) $ [T\propto R^{2}] $

C) $ [T^{2}\propto R] $

D) $ [T\propto R] $

Show Answer

Answer:

Correct Answer: B

Solution:

Gravitational force provides the required centripetal force $ [m{{\omega }^{2}}R=\frac{GMm}{R^{3}}] $ $ [\Rightarrow ] $ $ [\frac{4{{\pi }^{2}}}{T^{2}}=\frac{GM}{R^{4}}] $ $ [\Rightarrow ] $ $ [T\propto R^{2}] $



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