Question

an artificial satellite is moving in a circular orbit of radius 7000km and takes 2hrs to revolve once around the earth. calculate the speed of satellite

Answer 1

Since the radius is 7000km, the distance travelled in two hours is $\pi*14000=43,982.297$ So it goes that much in two hours and it can go 
$\frac {\pi*14000}{2}=21,991.148$. 

Therefore the speed is 21,991.148km/h

Answer 2

Answer:

Radius=7000km

Circumference=2πr

=2×(22/7)×7000

=44000 Km

Distance=44000km

Time=2hrs

Speed=Distance/Time

= 44000/2

=22000km/hrs

Hope it is clear...

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