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Question
A meter scale is provided at 10 cm mark and is balanced by suspending 400 g from 0 cm mark (fig. ). Calculate the mass of meter scale.
Solution
Let m be the mass of the metre scale
In balancedcondition, sum of clockwise moments = sum of anticlockwise moments
400 x 10 = m x 90
or 4000 = 90m
or m = 44.4g
the mass of the scale is 44.4g
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