A uniform half metre rule can be balanced at the 29.0 cm mark when a mass 20g is hung from its one end .Find the mass of the half metre rule.

Dear Student

For meter scale, centre of mass is considered at 50 cm mark. If by tying stone, it can be balanced at 29 cm then we can equate moments as follows

20g*29cm=mscale*(50-29)=mscale*21

mscale=20*2921=27.61 gRegards

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