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Properties of Matter — Physics STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11PhysicsProperties of Matter2 Marks
Question
A cubical copper block has each side $2.0 cm$. It is suspended by a string and submerged in oil of density $820 kg m ^{-3}$. Calculate the tension in the string.(density of copper $=8920 kg m ^{-3}$ )
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Answer

$\text { Tension }=\text { true weight }- \text { upthrust due to oil } $
$= V \rho g- V \sigma g= V (\rho-\sigma) g $
$ =\left(2 \times 10^{-2}\right)^3 \times(8920-820) \times 10=8 \times 10^{-6} \times 8100 \times 10$

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