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] $
