Mathematics

Mathematics

Problem

Two non-zero vectors P⃗\vec P and Q⃗\vec Q are perpendicular to each other. Which one of the following quantities is necessarily zero? a) ∣P⃗×Q⃗∣|\vec P\times\vec Q| b) P⃗⋅P⃗\vec P\cdot\vec P c) P⃗⋅Q⃗\vec P\cdot\vec Q d) ∣P⃗∣ ∣Q⃗∣|\vec P|\,|\vec Q|

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