September 8th, 2017, 08:18 PM  #1 
Newbie Joined: Sep 2017 From: Sydney Posts: 17 Thanks: 0  Vector Calculus problem 2
From the attachment, I managed to get the answers correct till surface area however I can't seem to get the vertical height of a helicoid becasue I dont know how to get it. What is the solution and how to get to that ?

September 8th, 2017, 09:27 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,695 Thanks: 861 
maybe I'm missing something but $z = 2v$ and $0 \leq v \leq 2\pi$ so the vertical height should be $4\pi  0 = 4 \pi$ 

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calculus, problem, vector 
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