Asked by Francis
                A uniform metre rule AB is balanced horizontally at the 90cm mark with mass 0.2kg suspended from B. Calculate the mass of the metre rule
            
            
        Answers
                    Answered by
            oobleck
            
    if the density of the rod is x kg/cm, then consider the mass of each part of the rod as being a point at the center of that part.
90x*45 = 10x*5 + 0.2*10
    
90x*45 = 10x*5 + 0.2*10
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