dot product question (1 Viewer)

kractus

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Just not sure where to start. I wrote out equations where i let a and b be some arbitrary vector and got nowhere.
 

wizzkids

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If you are struggling to get started with vector questions, then try drawing a diagram of what is going on.
Untitled.png
From the definition of the dot product, we know that 5=a x b x cosΘ
With those hints, can you finish it off?
 

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