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## Homework Statement

A satellite is in a circular polar orbit at a height of 870 km, the orbital period being approximately 102 min. The satellite orbit passes directly over a beacon at sea level. Assuming an average value of earth’s radius of 6371 km determine approximately the fractional Doppler shift at the instant the satellite is first visible from the beacon.

A satellite is in a 400-Km high circular orbit.

Determine:

a) The orbital angular velocity in radians per second.

b) The orbital period in minutes.

c) The orbital linear velocity in meters per second.

d) There is a very important satellite orbiting the earth doing astronomical research with a similar orbit. Which one is it?

f) Why it uses such a low orbit?

## Homework Equations

maybe V = squareroot u/R.

## The Attempt at a Solution

I'm using f = ( v/v+vs) fo.