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A uniform meter scale is in equilibrium ...

A uniform meter scale is in equilibrium as shown in the diagram :

Calculate the weight of the meter scale.

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Let W gf be the weight of metre rule which acts downwards from 50 cm mark
In equilibrium position, taking moments about fulcrum,
Anticlockwise moment `= 40 xx (30 - 5) = 1000 `gf cm
Clockwise moment `= W (50 - 30) = 20 `W gf cm
` therefore ` Using principle of moments, 20 W = 1000
` therefore ` Wt. of metre scale W = 50 gf
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