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postfan
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Homework Statement
An object of mass M moves under the influence of an attractive central force F = - A r^4 \hat{r} where \hat{r} is a unit vector in the radial direction.
If the object is in a circular orbit of radius R , find its speed v as a function of M,A, and,R.
Homework Equations
a=v^2/r
The Attempt at a Solution
I rearranged the above equation to v=sqrt(ar). I know that the radius is R but I don't know what the acceleration is. Help!