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## Homework Statement

It can be assumed that the Earth, to a good approximation, moves in a circular orbit about the sun. Determine the speed of the Earth.

## Homework Equations

v

^{2}= GM

_{earth}/r

## The Attempt at a Solution

m

_{earth}= 5.98x10

^{24}

R of earths orbit= 1.49x10

^{11}

G= 6.67x10

^{-11}

v

^{2}= (6.67x10

^{-11})(5.98x10

^{24})/ (1.49x10

^{11})

v

^{2}= (3.98x10

^{14}) / (1.49x10

^{11})

v= [itex]\sqrt{}2676.9[/itex]

v= 51.7m/s

Now here's the problem. My teacher said that the answer to this question is 2.97x10

^{4}m/s

What is it that I am doing wrong? D: