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    brijmohan123456's Avatar
    brijmohan123456 Posts: 41, Reputation: 1
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    #1

    Oct 28, 2012, 05:55 AM
    Find the torque
    Find the torque of force 7i-3j-5k about the origin which acts on a particle whose position vector is 7i+j-k
    retina111's Avatar
    retina111 Posts: 10, Reputation: 1
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    #2

    Oct 28, 2012, 06:31 AM
    Here, the torque can be found by calculating cross product of position vector and force.
    T= R*F
    Cross product can be calculated with the help of the following:
    I*j = k
    j*k = I
    k*i = j
    j*i= -k
    k*j = -i
    I*k = -j
    and I*i, j*j, k*k = 0
    so we have (7i + j - k) * (7i -3j-5k)
    = -8i +28j-28k
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