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Q.

The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If the speed of satellite A is 3v, then the speed of satellite B will be :-

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a

6v

b

12v

c

3v2

d

3v4

answer is C.

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Detailed Solution

Speed of satellite V=GMr

⇒  VBVA=rArB=4RR=2 ⇒  VB=(3v)(2)=6v

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The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If the speed of satellite A is 3v, then the speed of satellite B will be :-