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Contadoren11
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Homework Statement
Hi,
I've been tasked with showing that the length of vector F_gravity is inversely proportional with radius squared (i.e. |F_vector|=c/r^2) and is central, i.e. consistently directed toward the same point. Apparently, this is the same as (<=>) the acceleration of a particle following an elliptical path being radial (and thus, directed towards the same point as F) *and* it being equal to
a_r = - C/r (1)
where C is a universal constant.
C ends up being 4*π^2*(a^3/T^2), i.e. positive.
My questions are: Why is there a minus in (1), and what is the explanation for the <=> being valid? I realize it's Newtons 2nd law, but the constants C and c could conceivably differ by more than m, no?
Apologies for the shoddy notions, not used to doing physics in english (or writing formulas outside of Word...)
Homework Equations
|F_vector|=k*1/r^2 and central
<=>
a_r = - C*1/r (1)
where C is a universal constant. C ends up being 4*π^2*(a^3/T^2), i.e. positive.
The Attempt at a Solution
Can't figure it out.
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