Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels.

Question

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours)  is 11.8 and findthe speed (m/s) their spacecraft travels.

b) Speed of spacecraft in meters per second 
 m/s
.

drwls · Answer

20,000 km above anywhere in Earth is 26380 km above the center. The spacecraft travels 2*pi*26380*10^3 meters in 11.8*3600 seconds, for a circular orbit. Take the ratio. 3900 m/s is the speed.