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Numerade Educator



Problem 14 Easy Difficulty

Find $ \mid u \times v \mid $ and determine whether $ u \times v $ is directed into the page or out of the page.

$ \mid v \mid = 5 $
$ \mid u \mid = 4 $


$|\mathbf{u} \times \mathbf{v}|=10 \sqrt{2}$
The vector $\mathbf{u} \times \mathbf{v}$ must point out of the page.

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Video Transcript

Hello. Welcome to this lesson in this lesson finding the cross ball that the magnitude of the cost at the cross border at you was vain. So this has given us the magnitude of you times the magnitude of a sigh. Feta. Okay, so you called me magnitude is giving us the The magnitude of you is mhm. Mhm. Yeah. Oh, is four The magnitude of way is given us five. Then we have signed 45. So let's look at signed 45 in terms of radicals. Oh, yeah. Okay. Oh, so we have four times five is 20 then signed 45? Yes. Opposite source of sheet over. Hypertension of soul of seats one the opposite of the angle I put on us. Screw it off to So the whole thing is 20 over square root of 2/2. I was scared of tube. So this can be given us. You multiply there. It's covered by the skirt of two by the denominator in the numerator so that we can rationalize the whole thing. So we have scare. We talked. Yeah. You have 20 scourged of to Oliver too? Yeah, so here. That stands courage off. Two cool where I saw this. Is there the magnitude of the cost for that, then the cross for that You, cause me is out of this directed out of the pitch. Okay, so thanks for your time. This is the end of the lesson.