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tweety1234
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Homework Statement
A woman and a man support a non-uniform plank, AB of mass 10kg and length 4m. The woman holds the plank 1m from A and the man holds the plank at B. The vertical reaction provided by the woman is 56N find;
A) the vertical reaction force provided my the man
b) The position at which at which the weight of the plank acts measured from A.
Homework Equations
The Attempt at a Solution
I worked out the vertical reaction produced by the man which is 42N, but I am really stuck on question 'b' ...
the answer in my book says the center of mass is 2.29m from A,
I have drawn a diagram, can anybody please check it and let me know what's wrong with it?
also my moments equation is..
[tex] 56N \times 1m + 42N \times 4m = 98N (xm-3m) [/tex]
http://www.mathhelpforum.com/math-help/attachments/advanced-applied-math/9167d1228774308-mechanics-help-untitled.jpg
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