Answer :
The period of an earth satellite in a circular orbit of radius 7000 km will be 4.4 × 10⁴ km.
What results in a circular orbit?
Every orbit about an object it around "parent" is a delicate balancing act between gravitational force and the object's need to travel straight ahead. An precise force balance would result in a circular orbit, although this is uncommon.
Who conceived about circular orbits?
Early in the 17th century, German scientist Johannes Kepler proposed three planetary motion principles. His predecessors' work, particularly that of Tycho Brahe and Nicolaus Copernicus, served as the foundation for his rules. The planets move in a circular route around the sun according to Copernicus' theory.
Well, this is easy as 1 period is same as circumference of a circle
so we can us the formula of circumference i.e.
C = 2πr
As r is given = 7000 km
C = 2π(7000)
[tex]$ \mathrm{C = 2 \times \frac{22}{7} (7000)}[/tex]
[tex]$ \mathrm{C = 2 \times 22} \times 1000}[/tex]
C = 44000 km or 4.4 × 10⁴ km
Thus, the period of an earth satellite in a circular orbit of radius 7000 km will be 4.4 × 10⁴ km.
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