Okay, thanks for that idea. I plotted the graph and put in values for A, a and m. I didn't read the question properly, but I understand that if I want to know the minimum force required then I need to differentiate V'(r) to obtain V''(r), and set this equal to 0 and solve for r.
Once I solve for...
I thought if Work Done = Force * Distance then I could rearrange that equation to get Force = Work Done / Distance. And have (I probably shouldn't call it Vmax(r)), Vmin(r) = Work Done
But the Force equals -dV(r) / dr, at a point. I could try differentiate my value of Vmin(r) with respect to r...
Homework Statement
Part (d) is the bit I am having trouble doing (the question is in the attachment).
Homework Equations
Apart from what is shown, I also have to use F = dV(r) / dr
The Attempt at a Solution
For Part (b), I showed this by differentiating the potential energy and equating this...