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NEET2015PhysicsGravitationActual

A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 × 10 6 m above the surface of earth. If earth's radius is 6.38 × 10 6   m and g = 9.8   m  s - 2 , then the orbital speed of the satellite is: Mass of earth undefined

Options

  1. A8.56 k m s - 1
  2. B9.13 k m s - 1
  3. C6.67 k m s - 1
  4. D7.76 k m s - 1

Correct answer

D. 7.76 k m s - 1

Step-by-step solution

V 0 = G M r = G M R 2 . R 2 r = 9.8 × 6.38 × 6.38 6.63 × 10 6 = 60 × 10 6 m/sec = 7.76 km/sec

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