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Math Help - Vectors

  1. #1
    Member classicstrings's Avatar
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    Vectors

    Vectors a and b are such that the magnitude of a = magnitude of b and the angle between a and b is 40 degress. The angle between vectors a and a + b is?

    Thanks for the help!
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  2. #2
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    Quote Originally Posted by classicstrings View Post
    Vectors a and b are such that the magnitude of a = magnitude of b and the angle between a and b is 40 degress. The angle between vectors a and a + b is?

    Thanks for the help!
    Hello, classicstrings,

    do the addition of vectors geometrically. Because \|{\vec{a}}=\|{\vec{b}} you'll get a rhombus. Thus the vector \vec{a}+\vec{b} bisect the angle. So the value of the angle you are looking for is 20°.

    EB
    Attached Thumbnails Attached Thumbnails Vectors-winkl_vectors2.gif  
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  3. #3
    Member classicstrings's Avatar
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    dankeschön! My german exam is tommorrow , then maths on Wednesday, then chinese on thursday!
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