The radius of the earth's (almost circular) orbit around the sun is $150,000,000 \mathrm{~km}$, and it takes $1 \mathrm{y}$ for the earth to go around the sun. Imagine that a certain satellite goes in an almost circular orbit of radius $15,000 \mathrm{~km}$ around the earth (this radius is 10,000 times smaller than the earth's orbital radius around the sun). What is the period of this orbit?
A) $10^{-6} \mathrm{y}$
B) $10^{-4} \mathrm{y}$
C) $10^{-3} \mathrm{y}$
D) $10^{6} \mathrm{y}$
E) These periods are not related in any simple way.

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The Answer of The radius of the earth's (almost circular) orbit around the sun is $150,000,000 \mathrm{~km}$, and it takes $1 \mathrm{y}$ for the earth to go around the sun. Imagine that a certain satellite goes in an almost circular orbit of radius $15,000 \mathrm{~km}$ around the earth (this radius is 10,000 times smaller than the earth's orbital radius around the sun). What is the period of this orbit?
A) $10^{-6} \mathrm{y}$
B) $10^{-4} \mathrm{y}$
C) $10^{-3} \mathrm{y}$
D) $10^{6} \mathrm{y}$
E) These periods are not related in any simple way.

The Radius of the Earth's (Almost Circular) Orbit Around the Sun