ErinWeeks
  • ErinWeeks
Find the specified vector or scalar.
Mathematics
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
ErinWeeks
  • ErinWeeks
u = -4i + 1j and v = 4i + 1j; Find ||u+v||
AkashdeepDeb
  • AkashdeepDeb
I suppose here we have to find the magnitude of the absolute value or the reverse! First just add the 2 vectors -4i + 1j + 4i + 1j ||2j|| So magnitude is 2 units! I think that IS how you do it! @Preetha ?
Psymon
  • Psymon
You got the answer correct, kinda.....and I think by accident, haha.

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ErinWeeks
  • ErinWeeks
im not sure i basically got at the end 0i + 2j and just wanted to make sure the answer was 2
AkashdeepDeb
  • AkashdeepDeb
It is 2 because 0i is a zero vector which does not exist in this case!! So yeah...2 is the answer!! :D
Psymon
  • Psymon
It is 2. Ill show ya what you do, though. The magnitude of a vector is basically its length. Here is just a vector I invent to show you a picture: |dw:1377759934457:dw|
Psymon
  • Psymon
|dw:1377759997384:dw|
Psymon
  • Psymon
|dw:1377760033067:dw|
Psymon
  • Psymon
Therefore we added the two vectors and got 0i + 2j. To find the magnitude, we do that pythagorean theorem to say: \[magnitude ^{2}= i ^{2}+j ^{2}\] \[m ^{2} = 0^{2}+2^{2}\] \[m ^{2}=4-> m = 2\]

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