A uniform meter scale is balanced at the 20cm mark when masses of 100g and 50g are suspended from 10cm and 30cm marks respectively. Calculate the mass of the metre scale.
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Weight of scale = = 66.66 g
Explanation:
Let's denote the weight of the scale by 2.
The scale is 20cm and 100g is suspended on one end (0 mark) when balanced.
So the weight of longer arm i.e. BC is balanced by 100g
So CW moment = A.C.W moment
W × 30 = 20 × 100
= 2000 / 30
= 66.66g
A weight of 100g should be suspended at zero mark.
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