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Density

A block of wo...

Question

A block of wood is floating on oil with half of its volume submerged. If the density of oil $840 k g m^{- 3}$ , the relative density of wood (relative to water) is

A

0.84

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B

0.42

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C

0.21

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D

1

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Solution

The correct option is B 0.42
$\frac{v}{V} = \frac{d_{w}}{d_{L}}$
$\frac{1}{2} = \frac{d_{w}}{840} \Rightarrow d_{w} = 420 k g / m^{- 3}$
$R . D . = \frac{420}{10^{3}} = 0.42$

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