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The dot product of u with itself is 12. What is the magnitude of u?

A. 24

B. 12

C. 2√6

D. 2√3

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Answers (1)
  1. 6 July, 18:26
    0
    Dot product is

    a*b = |a|*|b|*cosα.

    In our case

    u*u = |u|*|u|*cos 0

    u*u = |u|*|u|

    12=|u|²

    |u|=√12=√ (4*3) = 2√3

    Answer: D. 2√3
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