- #1
daysrunaway
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Homework Statement
A certain spherical planet which is not rotating has a radius of 6.36 x 105 m and a mass of 1.89 x 1021 kg. At what minimum speed would a vehicle traveling along its surface just begin to leave the ground?
Homework Equations
FC = mv2/r
FG = GMm/d
The Attempt at a Solution
My problem is I don't know how to set the initial equation up: Is it,
FC = GMm/d2 = mv2/d
Or is it,
1/2mv2 = GMm/d?
They will differ by a factor of root 2.
If it was vertical velocity I would know it needs to be KE = PE, but since it's horizontal I'm confused. Can someone explain?