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    Determine the moment of the 60N force about point A on the perimeter of the disk by determining the lever arm of the force:
    (Note, the lever arm is the perpendicular distance from the line of action of the force to the point where the moment is to be taken about)

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    Any ideas?

    I cannot calculate the perpendicular distance from the line of action of the force to the point A.
    I have tried calculating the lengths of the other lines that would add up using pythagoras theorem to obtain the perpendicular, but I can't find the necessary angles.
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    (Original post by sulexk)
    Any ideas?

    I cannot calculate the perpendicular distance from the line of action of the force to the point A.
    I have tried calculating the lengths of the other lines that would add up using pythagoras theorem to obtain the perpendicular, but I can't find the necessary angles.
    Calculate AC by the cosine rule. The angle AOC is 165. AO=OC=250
    The angle between AC and the force is 60 (75-15).
    The perpendicular distance (d) d=AC*sin 60
    Click image for larger version. 

Name:	moment.png 
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    (Original post by ztibor)
    Calculate AC by the cosine rule. The angle AOC is 165. AO=OC=250
    The angle between AC and the force is 60 (75-15).
    The perpendicular distance (d) d=AC*sin 60
    Click image for larger version. 

Name:	moment.png 
Views:	20 
Size:	16.2 KB 
ID:	139918
    Thank you very much

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