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Vrbic
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Ok, I want to draw an energy. So for a stretching phase I have to put more energy more strength to change r than in relaxing phase. Stretching starts at Rmax and finishes at Rmin and here is acting Fmax. A relaxing phase starts at Rmin and finishes at Rmax where I guess is acting Fmin. i.e. I have to have greater value for ks than kr. I'm attaching a figure.haruspex said:Not the most convenient formula here. The sides are vertical, which makes it much simpler.
The two elasticities give the slopes at top and bottom of the quadrilateral, and you know both lines pass through the origin.
You need to decide which vertex corresponds to Fmin and which to Fmax. Any thoughts?
https://www.dropbox.com/s/hxuetrfgcim92j3/F vs r.jpg?dl=0
It is a trapezoid so area ##A=\frac{(F_s(r)-F_r(r))+(F_s(r+dr)-F_r(r+dr))*dr}{2}##, where ##F_r(r)=F_{min}## in Rmax and ##F_s(r+dr)=F_{max}## in Rmin.
Right?