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September 8th, 2017, 08:18 PM   #1
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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 ?
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September 8th, 2017, 09:27 PM   #2
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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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