Let's discuss a problem where we find a stable equilibrium point, useful for Physics Olympiad.
The Problem:
Find the stable equilibrium point corressponding to the potential (U(x)=k(2x^3-5x^2+4x)).
Disucssion:
$$ U(x)=k(2x^3-5x^2+4x)$$
Differentiating with respect to x
$$ \frac{dU}{dx}=k(6x^2-10x+4)
$$
Differentiating again,
$$ \frac{d^2U}{dx^2}=k(12x-10)
$$
Putting (x=1) $$ \frac{d^2U}{dx^2}=+2k$$
This is positive because (k) is positive and it is the minimum hence the (x=1)
corresponds to stable equilibrium.
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