The ISS orbits around Earth, at an altitude of 350. km. What is the speed? What is the period? How many orbits will complete per day?
and it will complete 16 orbits per day.
For this solution we will make the (reasonable) assumption that the ISS exhibits uniform circular motion.
In that case we can use this equation for the speed:
But two of the variables in that equation are unknowns (
First work out the radius of orbit.
Now calculate the time period.
We can use that in the first equation above to calculate the speed:
We can write the period in minutes or hours to make it more practical:
Lastly, we want to know how many orbits the ISS will make per day. Divide the total time of one day (24 hours) by the time for one orbit in hours: