metre rule, knife edge 50g mass and thread

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1. It is found that a uniform metre rule of mass 50g can be balanced on a knife-edge when a mass of 20g is hung 20cm from one end
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2. A uniform half metre rule is balanced horizontally across a knife edge placed 20cm from A. A mass of 22.5g is hung from end A.1.
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3. A body of mass 60g is suspended at the 29cm mark of a uniform metre rule. The metre rule is adjusted on the knife edge until it
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4. you are supplied with a metre rule a100g weight,a knife edge,thread and an object of mass between 50g and200g describe an
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