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March 20th, 2018, 09:25 AM   #1
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Vectors Help

Hi, I have no idea how to do this question. However, I have done up certain portion which is to my best understanding. Help is greatly appreciated.
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March 20th, 2018, 09:54 AM   #2
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Looks like you are doing it correctly. You just stopped before grinding through the algebra.

Can you compute

$p \cdot k,~\|p\|$ ?

Hopefully you know that $\|k\|=1$ and that $p\cdot k = p_z$
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