An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
We know that,
v =
(i)
We have to calculate the speed
π=
(It is a constant)
Radius, r = 42250 km
Time, t = 24 h
Putting these values in (i), we get
Speed, v = 
v = 11065.4 km/h
= 
km s-1
= 3.07 km s-1
18