Khanh N.

asked • 08/20/16

Find the resultant vector by adding the following vectors: 250m 10o West of South and 455m 26o North of East

Find the resultant vector by adding the following vectors:
250m 10o West of South and 455m 26o North of East
 
Thank you!

2 Answers By Expert Tutors

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Neal D. answered • 08/20/16

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Khanh N.

What I did was: 250^2 + 455^2 - 2 x 250 x 455 x cos (126 ) = 403,246 m. Is that correct, sir?
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08/20/16

Neal D.

That is using the Law of Cosines
 
Now take the square root of your answer because:
 
c^2 = a^2 + b^2 -2ab(cosC);
 
that is outstanding, GREAT JOB!
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08/20/16

Khanh N.

Ah, I forgot to take the square root, that's why I feel strange about my answer! :D
 
Thank you so much, sir!
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08/20/16

Neal D.

If two sides of the triangle are 455 and 250 in length, the long side will be less than 705!
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08/21/16

Khanh N.

Yes, I remember the about that :)    a-b<c<a+b :D
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08/21/16

Kenneth S. answered • 08/20/16

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4.8 (62)

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