# physics

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space shuttle is orbiting about 300.1 km above
Earth’s surface.
If the average speed of the space shuttle is
25700 km/h, ﬁnd the time required for it to
circle Earth.

• physics -

Radius of the orbit R = 6380 + 300.1 km

The circumference of the orbit is
C = 2(Pi)R km

The period of the orbit is then

P = 2(Pi)R/25,700 km/hr

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