An artificial planet is moving in a circular orbit of radius 42250km. Calculate its speed if it takes 24hours to revolve around the earth.
3.07 km/s
Speed is defined as the ratio of the total distance travelled to the time taken (T).
Distance, s=2πR
where R is the orbital radius.
Speed:
v=2πRT
v=2×π×4225024×3600
[∵1hr=60×60=3600s]
⟹v=3.07kms−1