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Math Help - Vectors

  1. #1
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    Vectors

    Can someone please help me with this problem. Thanks a lot!

    Question: You have three vectors, F1=35 w/40 degrees, F2=40 w/25 degrees, F3= 80 w/30 degrees. Find the resultant vector of all three.

    What I did: 40 sin 25 + 35 sin 40 = 39.40
    40 cos 25 + 35 cos 40 = 63.06
    then I divide each of these two number to each other w/ tan inverse and got 2.26 then I am stuck. By the way I did what I did so far is wrong. I am very confuse cause the correct answer was 78.4 and 17.1 degree. Can u please tell me what I did wrong or how to do this problem. Thanks again!
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  2. #2
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    Quote Originally Posted by jsu03 View Post
    Can someone please help me with this problem. Thanks a lot!

    Question: You have three vectors, F1=35 w/40 degrees, F2=40 w/25 degrees, F3= 80 w/30 degrees. Find the resultant vector of all three.

    What I did: 40 sin 25 + 35 sin 40 = 39.40
    40 cos 25 + 35 cos 40 = 63.06
    then I divide each of these two number to each other w/ tan inverse and got 2.26 then I am stuck. By the way I did what I did so far is wrong. I am very confuse cause the correct answer was 78.4 and 17.1 degree. Can u please tell me what I did wrong or how to do this problem. Thanks again!
    you only added two of the three vectors?

    recheck the magnitudes and directions because F_1 + F_2 + F_3 is not the "answer" you cite.
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