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A uniform metre scale is in equilibrium ...

A uniform metre scale is in equilibrium position. Calculate the mass of the ruler.

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Let, m be the mass of scale in gram
`therefore ` Weight of scale = m gf
By principle of moment, we et
`40 xx (30-5) = m xx (50-30)`
`[because` centre of gravity of scale is 50 cm]
`implies 40 xx 25 = m xx 20 implies m = 50 g`
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ICSE-SAMPLE QUESTION PAPER 4 -SECTION B
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