(A) To convert density from $CGS$ $(g/cm^3)$ to $SI$ $(kg/m^3)$:$1 \, g/cm^3 = \frac{10^{-3} \, kg}{10^{-6} \, m^3} = 10^3 \, kg/m^3 = 1000 \, kg/m^3$

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(A) To convert density from $CGS$ $(g/cm^3)$ to $SI$ $(kg/m^3)$:$1 \, g/cm^3 = \frac{10^{-3} \, kg}{10^{-6} \, m^3} = 10^3 \, kg/m^3 = 1000 \, kg/m^3$.Given density = $0.5 \, g/cm^3$.Therefore,$0.5 \, g/cm^3 = 0.5 \times 1000 \, kg/m^3 = 500 \, kg/m^3$.