Question

find velocity if G=6.67×10^-11,M=4×6×10^24andr=42180​

Answer 1

Explanation:

We can find velocity simply by equating centripetal force and gravitational force.

Centripetal force = Gravitational force

$\frac{mv {}^{2} }{r } = \frac{gm {}^{2} }{r {}^{2} } \\ \\ \: v {}^{2} = \frac{gm}{r} \\ \\ \\v = \sqrt{ \frac{gm}{r} }$

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