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Question

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.


  1. 1.28 km/s

  2. 4.21 km/s

  3. 2.07 km/s

  4. 3.07 km/s


Solution

The correct option is D

3.07 km/s


Speed =Circumference of orbitTime period

=2πRT

=2×π×4225024×3600kms1 
[1hr=60×60=3600 s]

=3.07kms1

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