a piece of wood of mass 150g has a volume of 200cm³ .find the density of wood in (a)CGS system (b) S.I. SYSTEM.

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Solution

Density = $\frac{m a s s}{v o l u m e} = \frac{150}{200} \frac{g}{c m^{3}} = 0.75 g c m^{- 3}$ (in CGS units)
As, 1 kg = 1000 g
150 g = 0.15 kg
and 1 m³ = 10⁶ cm³
so, 200 cm³ = 2 X 10^-4 m³
Again using the above formula for density :
we get Density in Si units = 750 kgm^-3

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