Gravitation Question 248

Question: Orbital velocity of earth’s satellite near the surface is 7 km/s. When the radius of the orbit is 4 times than that of earth’s radius, then orbital velocity in that orbit is [EAMCET (Engg.) 1995]

Options:

A) 3.5 km/s

B) 7 km/s

C) 72 km/s

D) 14 km/s

Show Answer

Answer:

Correct Answer: A

Solution:

$ [v\propto \frac{1}{\sqrt{r}}.] $ If orbital radius becomes 4 times then orbital velocity will become half. i.e. $ [\frac{7}{2}=3.5\ km/s] $



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