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Math Help - Need help with algebra based physics problem

  1. #1
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    Need help with algebra based physics problem

    A cook holds a 2.00 kg carton of milk at arm's length. What force B must be exerted by the biceps muscle? (Ignore the weight of the forearm.)
    1 N

    I have been trying for a while to figure this one out and its just not coming to me. I know the answer is supposed to be 312N. Any help would be appreciated. Thanks.
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  2. #2
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    First, this has nothing to do with "Linear and Abstract Algebra" and does not belong in this category.

    Second, draw horizontal and vertical lines making a right triangle with \vec{F}_B as hypotenuse. The vertical side is a "near side" to that 75 degree angle and will have magnitude F_B cos(75). In order to support the milk carton, we must have F_B cos(75)= 2.00. Solve that for F_B.

    That will give the force in "kg" which is really a mass. To get the force in Newtons, multiply by g= 9.81[/tex].
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  3. #3
    MHF Contributor
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    1) Why is this in Abstract Algebra. It's a physics problem. Trigonometry at worst on this one.

    2) Have you identified that you are dealing with a Type 3 Lever? That would be a good place to start.

    3) What forces must be equal? 2 kg * (25 cm + 8 cm) should be related to (sine or cosine of 75) * (bicep force) * (8 cm)

    I'll leave the details to you. Let's see what you get.
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