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How to find absolute bending moment??????

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As load passes the cutting section(where we want to know SF,BM )first we have find SF ,BM.Then come back original diagram first find the centroid of the given loading system from left end,after choose the point which load is max  near to the centroid of the load system from left end the half of the difference b/w the these two is the point where the absolute moment occur for given loading system.
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