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Math Help - Mechanics again

  1. #1
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    Mechanics again

    S1 and S2 are light inextensible strings, and A and B are particles each of mass 0.2 kg. Particles suspended from a fixed point 0 by the string S1 and particle B is suspended from A by the string. The particle hang in equlibirum...

    Find tension in s1 and s2




    s1 = 4 N and s2 = 2N

    Second part, string S1 is cut and the particles fall, the air resistance acting on A is 0.4N and the air resistance on B is 0.2N

    Find acceleration force acting on the particles and tenstion in s2 ???!!

    Could someone explain me the concept of this.... exams are close and i dont understand this question at all
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  2. #2
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    Quote Originally Posted by ramzel View Post
    S1 and S2 are light inextensible strings, and A and B are particles each of mass 0.2 kg. Particles suspended from a fixed point 0 by the string S1 and particle B is suspended from A by the string. The particle hang in equlibirum...

    Find tension in s1 and s2




    s1 = 4 N and s2 = 2N

    Second part, string S1 is cut and the particles fall, the air resistance acting on A is 0.4N and the air resistance on B is 0.2N

    Find acceleration force acting on the particles and tenstion in s2 ???!!

    Could someone explain me the concept of this.... exams are close and i dont understand this question at all
    forces acting on mass A ...

    R_A = 0.4 N up , T down, mg down

    F_{net} = ma

    T + mg - R_A = ma

    forces acting on mass B ...

    R_B = 0.2 N up , T up , mg down

    mg - T - R_B = ma


    combine the two equations ...

    2mg - R_A - R_B = 2ma

    a = \frac{2mg - R_A - R_B}{2m}

    sub in your values to find a , then go back to either equation and calculate T.
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