A space shuttle travels around the Earth at a constant

speed of 28000 kilometers per hour. If it takes 90 minutes to

complete one orbit, how far is its journey around Earth?

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Sheet 1

how far the space shuttle is orbiting so we need to find radius of the circular path.

as speed = distance / time

28000 km/h = 2πr km / 1.5 hours

As 90 minutes = 1.5 hours

so

r = 28000*1.5 / 2π

= 28000 x 1.5 * 7/22 * 1/2

= 6681.81 km