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On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere.

On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. This satellite was injected into an orbit 705 {rm km} above the earth's surface, and we shall assume a circular orbit.
a) How many hours does it take this satellite to make one orbit?
b) How fast in km/s is the Aura spacecraft moving?

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