An artificial satellite is moving uniformly in a circular orbit of radius 42250 km. Find its speed if it takes 24 hour to revolve around the earth.
(A) 1760.4 km/h (B) 3.07 km/h (C) 3.07 km/s (D) 1760.4 km/s

Solution
Speed = DistanceTimeDistance = 2πr = 2×3.14×42250 = 265330 km Time = 24 hSpeed = 26533024 = 11055.4 km/hSoSpeed of satellite in km/s =26533024×60×60 =3.07 km/sThe satellite orbits the Earth at a speed of 11055.41 km/h or 3.07 km/h.

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