Calculate the approximate orbital speed of a satellite placed above the Earth’s surface

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

Calculate the approximate orbital speed of a satellite placed

400\,\text{km}

above the Earth’s surface. Take Earth’s radius

R_E = 6.4 \times 10^3\,\text{km}

and

GM_E = 3.99 \times 10^{14}\,\text{m}^3\text{s}^{-2}

. (a)

11.2\,\text{km/s}

(b)

6.2\,\text{km/s}

(c)

7.7\,\text{km/s}

(d)

8.2\,\text{km/s}