An artificial satellite revolves around Earth in a circular orbit above the surface

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

An artificial satellite revolves around Earth in a circular orbit

300\,\text{km}

above the surface. Given

R_{\!E}=6.4\times10^{6}\,\text{m}

M_{\!E}=6.0\times10^{24}\,\text{kg}

and

G=6.67\times10^{-11}\,\text{N\,m}^2\!\text{/kg}^2

, calculate its orbital speed in km\,s

^{-1}

correct to two significant figures.