How do I do this

Question

A satellite in a circular orbit 1250 km above the earth makes one revolution every 110 minutes. Assuming that earth is a sphere of radius 6378 km, what is the angular speed in radians per hour and linear speed in km per hour

Answer 1

T = period = 110 min = 110/60 hrs 

 

ω = 2π/T = 2π(60/110) rad/hr ≅ 3.427 rad/hr

 

v = ωr = (3.427 rad/hr)[(1250 + 6378) km] ≅ 26,141 km/hr