Earth has mass and mean radius

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Earth has mass

6.0\times10^{24}\,\text{kg}

and mean radius

6.4\times10^{6}\,\text{m}

. A satellite is placed in a circular orbit

600\,\text{km}

above Earth’s surface. The orbital speed of the satellite is closest to (a)

7.9\,\text{km\,s}^{-1}

(b)

10.7\,\text{km\,s}^{-1}

(c)

7.6\,\text{km\,s}^{-1}

(d)

8.3\,\text{km\,s}^{-1}