physics
posted by brett .
The Earth orbits the Sun once per year.What is the centripetal force keeping the Earth in orbit?
T = 1 year (convert to seconds)
r = 1.5e+11 meters
m = 6e+24 kg

physics 
drwls
Centripetal force = M*V^2/r
For V, use 2*pi*r/T
T = 3.154*10^7 s
Turn the crank
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