Question

If the moon revolves around earth in a circle of radius 38500 km in 29 days then it's average speed is approximately equal to

Answer 1

We know that,
Circumference of circle =2πr
Distance between earth and moon =Radius of circle=38500km
Therefore, distance travelled by moon in a month=2πr
=2*22/7*38500km
=2*22*55000km
=44*55000km
=2420000km
Hope this helps you ☺

Answer 2

we know that,
circumference of circle= 2π r
so,
2x22x38500
7
=242000km
now,
29 days = 696 hrs
speed = distance
time
= 242000
696
= 347.70 km/ hr