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Q.

A communication satellite of earth which takes 24 hrs. to complete one circular orbit eventually has to be replaced by another satellite of double mass. If the new satellites also has an orbital time period of 24 hrs, then what is the ratio of the radius of the new orbit to the original orbit ?

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a

2:1

b

1:2

c

1:1

d

2:1

answer is A.

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Detailed Solution

T2=4π2GMr3

  T1T223=r1r2 ⇒      r1r2=1    [∵ T1=T2]

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