Gravitational fields

  • Thread starter xxabr
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  • #1
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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


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= [itex]\sqrt{}2676.9[/itex]
v= 51.7m/s

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

Answers and Replies

  • #2
gneill
Mentor
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The important mass, the one that the Earth orbits, is the mass of the Sun.
 
  • #3
14
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Ohhhh. Okay, I got it. Thank you
 

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