Find |u v| if i) - Vidyadip

Question

Find $|\bar{u} \times \bar{v}|$ if
i)

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Answer

i) We have $|\vec{u} \times \bar{v}|=|\vec{u}||\vec{v}| \sin \theta=(4)(5) \sin 45^{\circ}=20 \frac{1}{\sqrt{2}}=10 \sqrt{2}$

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