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Math Help - magnitude forces/resultant/etc.

  1. #1
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    magnitude forces/resultant/etc.

    sorry guys i have dyscalculia
    1)Two forces act on an object. The first force has a magnitude of 76 pounds and makes an angle of 36 with the resultant. The magnitude of the resultant is 118 pounds. Find, to the nearest pound, the magnitude of the second force.

    2)Two forces of 11 pounds and 14 pounds,respectively, act on a body, The angle between the two forces measure 28. Find, to the nearest pound, the magntiude of the resultant force.

    3)Two forces 17 and 39 act on a body at an angle of 142. Find, to the nearest pound, the resultant of these two forces.

    4)Two forces 8 and 9. if the resultant force is 11. Find the measure of the angle betwee the two forces to the nearest degree.

    5)two forces 40 and 30. resultant 38. what is the angle between the two original forces.

    6)two forces act on a body at an angle of 120. The two forces are 28 and 35 pounds. Find magnitude of resultant force to the nearest tenth and find all angles.

    7)Forces are 8 and 6 and the magnitude of the resultant is 9 pounds. Find to the nearest degree the angle between the two forces
    Last edited by melissaIsHere; July 30th 2008 at 07:01 PM.
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  2. #2
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    Quote Originally Posted by melissaIsHere View Post
    sorry guys i have dyscalculia
    1)Two forces act on an object. The first force has a magnitude of 76 pounds and makes an angle of 36 with the resultant. The magnitude of the resultant is 118 pounds. Find, to the nearest pound, the magnitude of the second force.

    2)Two forces of 11 pounds and 14 pounds,respectively, act on a body, The angle between the two forces measure 28. Find, to the nearest pound, the magntiude of the resultant force.

    3)Two forces 17 and 39 act on a body at an angle of 142. Find, to the nearest pound, the resultant of these two forces.

    4)Two forces 8 and 9. if the resultant force is 11. Find the measure of the angle betwee the two forces to the nearest degree.

    5)two forces 40 and 30. resultant 38. what is the angle between the two original forces.

    6)two forces act on a body at an angle of 120. The two forces are 28 and 35 pounds. Find magnitude of resultant force to the nearest tenth and find all angles.

    7)Forces are 8 and 6 and the magnitude of the resultant is 9 pounds. Find to the nearest degree the angle between the two forces
    Have you drawn a well labelled diagram for each of these questions? Then added the forces head to tail and labelled the resulting triangles?

    If you follow the above advice, you can see how to apply the cosine rule to get:

    1) The magnitude x of the second force:

    x^2 = 118^2 + 76^2 - 2(76)(118) \cos 36^o.


    2) The magnitude x of the resultant force:

    x^2 = 11^2 + 14^2 - 2(11)(14) \cos (180 - 28)^o.

    By the way, a unit of force is NOT pounds ......


    4) The angle \theta between the two forces:

    11^2 = 8^2 + 9^2 - 2(8)(9) \cos \theta^o.

    Then the angle between the two forces is 180 - \theta degrees.


    etc.

    The sine rule might also be relevant to some of the other questions.
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    Quote Originally Posted by melissaIsHere View Post
    Alright at this point its pretty obvious ur going to just be sitting and waiting for every mistake i make. i came here for help not to be attacked for every tiny error i make so ill just leave and go elsewhere rest easy u win
    Actually I was sitting around typing a reply at this thread http://www.mathhelpforum.com/math-he...ltant-etc.html that I thought might help you.
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