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Mechanics 2 Help!!! watch

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    Please help me to solve the question in the box.
    Thank you very much.
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    (Original post by superkillball)
    Please help me to solve the question in the box.
    Thank you very much.
    Is the figure a wire-frame or a solid figure.
    and is that length = 60 cm?
    What are the other dimensions?

    Edit: ok, got the other dimensions.

    Edit²: it's the figure 3.2 that you want the com for!
    forget about the 60 cm!
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    For the lamina, I get centre of mass is at (12.526, 10.368), and for the wire, it's (14.595, 9.757).
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    taking moments about O: (m is the weight/unit length)

    horizontally:

    2*4m + 4*6m + 14*20m + 24*20m + 12*24m = x*74m

    => x = 14.59 = 14.6cm

    vertically:

    6*4m + 3*6m + 0*20m + 10*20m + 20*24m = y*74m

    => y = 9.76cm

    => COM = (14.59,9.76)
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    thank you very much
 
 
 

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