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Q.

An artificial satellite of earth is launched in circular orbit in equatorial plane of the earth and satellites moving from west to east. With respect to a person on the equator, the satellite is completing one round trip in 24 hrs. Mass of earth isM=6×1024kg . For this situation orbital radius of satellite is

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a

2.66×104km

b

6400 km

c

3600 km

d

29,600 km

answer is A.

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Detailed Solution

Here time period of satellite w.r.to observer on equator 24 hrs and satellite is moving from west to east, so west of satellite with respect to earth axis of rotation

ω=2πTS+2πTE

ω=2π24+2π24=2π12=π6=1.45×104rad/s

r3/2=GMω                           

Substitution we get  r=2.66×107m

=2.66×104km

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