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A remote-sensing satellite of earth revolves in a circular
P orbit at a height of \( 0.25 \times 10^{6} \mathrm{~m} \) above the surface of earth.
\( \mathrm{DV} \) If earth's radius is \( 6.38 \times 10^{6} \mathrm{~m} \) and \( \mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^{2} \), then the orbital speed of the satellite is:
\( (2015 \mathrm{Re}) \)
a. \( 6.67 \mathrm{~km} / \mathrm{s} \)
b. \( 7.76 \mathrm{~km} / \mathrm{s} \)
c. \( 8.56 \mathrm{~km} / \mathrm{s} \)
d. \( 9.13 \mathrm{~km} / \mathrm{s} \)
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