Posted by brett on .
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