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    sumatiedu's Avatar
    sumatiedu Posts: 1, Reputation: 1
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    #1

    May 10, 2007, 10:37 AM
    resultant vector angle
    what should be the angle between 2 forces of magnitude 1 N and 13 N so that the resultant is 6*(5)^1/2 N. find the angle between the resultant and 1 N force.
    asterisk_man's Avatar
    asterisk_man Posts: 476, Reputation: 32
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    #2

    May 10, 2007, 11:16 AM
    I think you should probably use law of cosines.
    Law of cosines - Wikipedia, the free encyclopedia
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    May 10, 2007, 11:28 AM
    Right - law of cosines will get you the angle between the 2 known forces. Then you could use the law of sines to find the angle between the resultant and the 1N force.
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