# Gravitational fields

## 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.

v2 = GMearth/r

## The Attempt at a Solution

mearth= 5.98x1024
R of earths orbit= 1.49x1011
G= 6.67x10-11

v2= (6.67x10-11)(5.98x1024)/ (1.49x1011)
v2= (3.98x1014) / (1.49x1011)
v= $\sqrt{}2676.9$
v= 51.7m/s

Now here's the problem. My teacher said that the answer to this question is 2.97x104m/s
What is it that I am doing wrong? D: