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Homework Help: Calculating Torque

  1. Aug 17, 2014 #1
    1. The problem statement, all variables and given/known data

    Please find attached image. Help me plzz find the torque.

    Let me know if need any more info. the lever with weight rotates about the hinge. Need torque about the hinge.

    Image with 50 kg weight:
    the 50 kg weight with link rotates about the red hinge point.

    angle is as shown.

    plz help me out its urgent. need to calculate the torque about the red hinge point.

    Assume Distances: black:x red: y conc. Mass size : z x z

    Image with 66 kg weight:
    Also if we imagine the second position of the lever, it rotating 90 degree about the hinge, the link in black will have zero moment right??

    then what will be the remaining torque.

    2. Relevant equations

    torque= distance * force or load

    3. The attempt at a solution
    i calculated the torque as
    1) here i did ((30+2+50)*9.81*Sin20degree) * (horizontal distance between red hinge and centre of Blue square mass: 260 mm)

    Am i doing it right.???

    (4.5*200*9.81) + (66*160*9.81)

    Am i doing it right

    Attached Files:

  2. jcsd
  3. Aug 17, 2014 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    In (1), length of bar is needed.
    sin(20) does not belong anywhere in your formula.

    In (2), the units of length are not standard units. Use SI units.
    What should be the lever length for the bar? Not 200 mm = 0.2m!
    You also left out the weight of the veetical bar holding the 66 kg weight.
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