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Q.

A body revolved around the sun 27 times faster then the earth what is the ratio of their radii

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a

1/3

b

1/9

c

1/27

d

1/4

answer is B.

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Detailed Solution

ωbody =27ωearth T2∝r3⇒ω2∝1r3⇒ω∝1r3/2∴r∝1ω2/3⇒rbody rearth =ωearth ωbody 2/3=1272/3=19
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