Physics

Problem

(Use

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

and

GM_{\oplus}=3.99\times10^{14}\,\text{m}^3\text{/s}^2

.) A satellite completes one circular revolution about Earth every

90\,\text{min}

. The corresponding orbital radius is closest to a)

4.2\times10^{7}\,\text{m}

1.3\times10^{7}\,\text{m}

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

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