Question

A satellite is orbiting earth at a distance of 42000 km in a circular orbit. It completes one revolution in 24 hours. Calculate its linear speed.

• A. 10990 km/hr
• B. 10890 km/hr
• C. 11000 km/hr
• D. 11880 km/hr

Answer 1

The correct option is (A) 10990 km/hr

Given,

Radius,$r=42000km$

Time taken,$=24hours$.
Total distance traveled by the satellite = $2\pi r$

Putting all the values
Distance $=2\times 3.14\times 42000=263760km$

Now,

Linear speed $=\frac{distance}{time}$ $=\frac{263760}{24}$ $=10990kmph$

Hence the linear speed of the satellite is 10990 km/h