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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.
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Solution
Clockwise Moment (due to 400 g at 0 cm)
Moment = 400 × (10 − 0) = 400 × 10 = 4000 g
Anticlockwise Moment (due to weight of scale at 50 cm)
Moment = M × (50 − 10) = M × 40
M × 40 = 4000 ⇒ M = `4000/40`
= 100g
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