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January 31, 2015

Posted by **Tabby** on Sunday, April 22, 2012 at 7:32pm.

Someone help me please?

- Sum Of Unit Vectors? -
**Reiny**, Sunday, April 22, 2012 at 8:52pmvector MN = [6+3/4 , -9-5 , 3/5-2/3]

= [ 27/4 , - 14 , -1/15]

magnitude of MN = √(729/16+ 196 + 1/225)

= √(870354/3600)

= appr. 15.549

so a unit vector in the direction of MN

= 1/15.549 [27/4, -14, -1/15]

= [ .434 , -.900 , -.004]

check: .434^2 + (-.9)^2 + (.004)^2 = .99918 (very close to 1, that's good)

so [ .434 , -.900 , -.004]

= .434[1,0,0] - .9[0,1,0] - .004[0,0,1]

- Sum Of Unit Vectors? -
**Tabby**, Sunday, April 22, 2012 at 9:20pmThank you so much for providing a clear explanation!! :)

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