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A uniform half-metre rule pivoted at the 10cm mark, balances when a mass of 150g is suspended at the 0cm mark as shown below. Determine the mass of the half-metre role. 
F3 ET1 Q4

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Clockwise moments = Anticlockwise moments
1.5 x 1.0 = W x 0.15
W = 0.15
       0.15
W=1N   

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