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Homework Help: Physics Homework

  1. Jan 23, 2007 #1
    :grumpy: Hey!! I have been trying this problem forever and can't seem to figure out the answer for y. I thought that I was supposed to take sin(41)*65?? But that answer keeps coming up as wrong?? Any help would be amazing!!!!

    A particle undergoes a displacement of magnitude 65 m in a direction 41° below the x axis. Express in terms of the unit vectors y and x.

    find: Delta r= _____X + ______y

    I am unsure how to fingue out how to get my y value. For x I took cos(41)*65=48, but I am unable to figure out how to find y???
  2. jcsd
  3. Jan 23, 2007 #2


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    Staff Emeritus
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    Have you taken into account the fact that the particle was displaced below the x-axis and thus y is negative?
  4. Jan 23, 2007 #3

    Gib Z

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    Homework Helper

    That problem would not occur if you took 41 degrees below the x axis, as 319 degrees absolute.
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