A wooden block measuring 40 cm $\times10 cm \times 5$ cm has a mass 850 g. Find the density of 3 wood. (425 $kgm^{-3}$)
Difficulty: Medium
Solution:
Volume of wooden block = V = 40 cm $\times 10 cm\times 5cm$ = $2000 cm^{3}$
=$\frac{2000 \times1}{100}$ $\times\frac{1}{100}$ $\times \frac{1}{100}$ $m^{3}$
= $0.002 m^{3}$
Mass = m = 850 g =$\frac{850}{1000}$ = 0.85 kg
Density of wood = $\rho$ = ?
Density =$\frac{Mass}{Volume}$ =$\frac{0.85}{0.02}$ = $425 kg^{-3}$
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