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Thread: Adding Vectors-Calculating Magnitude and Location

  1. #1 Adding Vectors-Calculating Magnitude and Location 
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    Hey if someone could help me on some homework I have i'd really appreciate it. I'm stuck on this problem.
    https://image.ibb.co/cPWE4F/File_000.jpg

    I know you have to add the vectors to get the location. like (3,x) +(-5,-12), but I'm stuck from there. The last bit has no coordinates (x,0). For the first vector do I need to use Pythagorean theorem to solve for y? By adding these coordinates I would get the location, but how do I get the magnitude? Do I add 10, 4 and 16?
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  2. #2  
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    Quote Originally Posted by kevbos View Post
    Hey if someone could help me on some homework I have i'd really appreciate it. I'm stuck on this problem.
    https://image.ibb.co/cPWE4F/File_000.jpg

    I know you have to add the vectors to get the location. like (3,x) +(-5,-12), but I'm stuck from there. The last bit has no coordinates (x,0). For the first vector do I need to use Pythagorean theorem to solve for y? By adding these coordinates I would get the location, but how do I get the magnitude? Do I add 10, 4 and 16?
    Hint, you need to use the "cosine formula" : https://math.stackexchange.com/quest...dition-formula
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  3. #3  
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    Quote Originally Posted by kevbos View Post
    Hey if someone could help me on some homework I have i'd really appreciate it. I'm stuck on this problem.
    https://image.ibb.co/cPWE4F/File_000.jpg

    I know you have to add the vectors to get the location. like (3,x) +(-5,-12), but I'm stuck from there. The last bit has no coordinates (x,0). For the first vector do I need to use Pythagorean theorem to solve for y? By adding these coordinates I would get the location, but how do I get the magnitude? Do I add 10, 4 and 16?
    You need to do a little bit of trigonometry in order to find the angle between the vectors,
    Once you have their angle , the length of the resultant is
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