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Question

A satellite is revolving near the earth's surface. Its orbital velocity is


A
5.8 km/s
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B
18.4 km/s
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C
11.2 km/s
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D
8.0 km/s
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Solution

The correct option is D 8.0 km/s
Orbital speed, $$v=\sqrt {\dfrac {GM}{R}}=\sqrt {\dfrac {6.67\times 10^{-11}\times 6\times 10^{24}}{6400\times 1000}}=7907.67$$ $$m/s$$ $$ = 7.9$$ $$km/s$$

Physics

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