Question:
The volume of a block of gold is 0.5 m3. If it is hammered into a sheet to cover an area of 1 hectare, find the thickness of the sheet.
Solution:
Volume of the block $=0.5 \mathrm{~m}^{3}$
We know:
1 hectare $=10000 \mathrm{~m}^{2}$
Thickness $=\frac{\text { Volume }}{\text { Area }}=\frac{0.5}{10000}=0.00005 \mathrm{~m}=0.005 \mathrm{~cm}=0.05 \mathrm{~mm}$