a unifirm metre scale is balanced at 20cm mark when a weight of 100gf is suspended from one end
.where must the weight be suspended? calculate the weight of the metre scale.
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Explanation:
Let w be the weight of metre scale.As the scale is balanced at 20cm and 100gf is suspended on one end (0 mark). The weight of longer arm i.e. BC is balanced by 100gf
∴ CW moment = A.C.W moment
W × 30 = 20 × 100W = 2000/30 = 66.66gf
wt. of 100gf should be suspended at zero mark.
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