The question tells me that some experiments have shown that the force needed to stretch a polymer molecule by an amount (Δl) is given approximately by:
F= (kBT/P)*((1/4)*(Lo2/(L-Δl)2-(1/4)+(Δl/L))
Yea, I know, nasty looking. Anywho:
F = Force
T = Temp.
kB = Boltzmann's Constant
P =...