Physics 2211 w. Dr. Larosa

Hopefully this works as a place to talk about study groups and problems we're having in 2211


    Chapter 3, problem 51.

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    Josh

    Posts : 4
    Join date : 2009-08-26

    Chapter 3, problem 51.

    Post  Josh on Wed Aug 26, 2009 8:52 pm

    For some reason I can not even seem to draw the picture. The way it is described I thought it was a basic triangle, with angles 28,69, and 83. Tried using the law of sines to solve, but didn't come up with the correct answer. Any help appreciated.
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    Ryan
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    Posts : 35
    Join date : 2009-08-25
    Age : 106
    Location : Kennesaw

    Re: Chapter 3, problem 51.

    Post  Ryan on Wed Aug 26, 2009 11:58 pm

    Hey Josh, I'll come back an post my diagram tomorrow when I'm near a scanner.

    The only way I could figure out how to solve this was with the Law of Sines. However, my angles ended up being different. (58,41,81)

    In the meantime maybe this will help:
    You have -
    Island A
    Island B
    Island C

    Angle ABC = 58
    Angle BCA = 41
    Angle CAB = 81

    Here's my first two steps of the problem...
    1. draw initial vector (4.76, 37 degrees)
    2. draw 2nd vector (from island 2 to island 3) The angle of this vector is 69 degrees from north, or 159 degrees total. However, that is the EXTERNAL angle of the triangle you are forming. You have to some minor geometry to get the internal angle. (you'll end up seeing this equation for angle ABC: 180-69-53 = 58 degrees) Hope that helps, but I will post the pic tomorrow.
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    Ryan
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    Posts : 35
    Join date : 2009-08-25
    Age : 106
    Location : Kennesaw

    Steps 1 and 2 for prob 51 ch 3

    Post  Ryan on Thu Aug 27, 2009 2:22 pm

    Here’s step 1 and 2 for problem 51.

    Remember this is how I got it to work. I’m sure there’s more than one way to do it.
    I’ll get the rest of the steps up when I have a moment. Thanks






    Josh

    Posts : 4
    Join date : 2009-08-26

    Re: Chapter 3, problem 51.

    Post  Josh on Sun Aug 30, 2009 4:14 pm

    This helped so much, thanks for your reply. I think my problem was where I was drawing the angles. Got mixed up with the west of north lingo.
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    Ryan
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    Posts : 35
    Join date : 2009-08-25
    Age : 106
    Location : Kennesaw

    Re: Chapter 3, problem 51.

    Post  Ryan on Wed Sep 09, 2009 9:41 am

    Glad that helped. Instead of doing a step by step for the rest, I'll just post my 'problem notebook' page.




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    Re: Chapter 3, problem 51.

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