Question

An astronaut moves on a circular orbit around the earth.what is the average speed for a whole revolution?

Answer 1

`Speed = "distance traveled"/"time of the trip" rArr "circumference"/"period" rArr (2pi R)/T`
`Speed ~~"5 miles"/s` for low orbits;
`Speed~~ "2 miles"/s` for geosynchronous orbit

Explanation:

To get a numerical value of the speed, you need to know the distance of the astronaut from the center of the earth and the time period to complete the round trip.

A typical satellite speed is between 2-5 miles/s.

Bear in mind that the speed of sound is only 0.2 miles/s. And a typical commerical airplane travels `~~ 65%`of speed of sound.