Physics

Problem

A wooden block of height

20\,\text{cm}

and density

820\,\text{kg m}^{-3}

is placed upright in a tank containing

12\,\text{cm}

of oil of density

700\,\text{kg m}^{-3}

over water of density

1000\,\text{kg m}^{-3}

. The top of the block stays level with the oil surface. How much of the block’s height is immersed in the water? a)

6\,\text{cm}

11\,\text{cm}

8\,\text{cm}

4\,\text{cm}