Struggling with Finals Revision? Get Help for Qn 3 in Less Than 12 Hours!

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A student is struggling with the final part of Question 3 in their exam revision, specifically regarding minimizing potential energy. They seek urgent help as their exam is imminent. A fellow user suggests performing a partial derivative with respect to z, setting it to zero to find the minimum, and emphasizes the importance of treating the integrand as a constant. The discussion concludes with a supportive inquiry about the student's exam performance. This exchange highlights the urgency and collaborative nature of exam preparation among peers.
babtridge
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OK so I'm revising for my finals and have spent 14 hrs revising today and cannot for the life of me get the very last part of Qn 3 on the attached link.
It begins "By minimising the potential energy..."

Could someone throw me a lifeline and explain what I need to do because my exam's in less than 12 hours and I'm nearly OD'ing on ProPlus! :bugeye:

Thanks a lot
 

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Ok, if you make a partial derivation respect to z and equal the result to zero, to minimize it; take off with the equality the constant pi and continue having ro, there put the argument that the integrand should be a constant (lambda) -the integration was over rdr - so you have the form requering, there you have actually directly the form of "a" and then go to pick the value required of lambda according to the problem . (put it more formal than me pls, i just taked a look)
 
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Yeah that's the one mate.
 
Sorry, hope you did ok on the test. How'd you do?
 

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