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anonymous

  • 5 years ago

find |vector d + vector e| given that |vector d|=3 and |vector e| = 5 where the angle between these two vector is 50 degrees.

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  1. anonymous
    • 5 years ago
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    is it 18.4

  2. anonymous
    • 5 years ago
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    the answer is 7.30 :( but i dont knw how to get it

  3. anonymous
    • 5 years ago
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    nw mine is cmng 13.9

  4. anonymous
    • 5 years ago
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    what did you do ?

  5. anonymous
    • 5 years ago
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    i did |d+e|^2=|d|^2+|e|^2 +2|d||e|cos |d+e|^2=25+9+30*50pi/180 |d+e|^2=34+5.23 =39.23 |d+e|^2=39.23 |d+e|=6.2

  6. anonymous
    • 5 years ago
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    i got it :) ! you just caclulated the cos value wronge :) ! but thanks alot i got the idea from your solution :) !

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spraguer (Moderator)
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