91Ó°ÊÓ

The given is two cubes, white and green

The objective is to find if the density is same, lower or higher of the green cube with the density of the grey cube

Density:

The ratio of a substance's mass and volume determines its density. A substance's density can be defined as its mass per unit volume.

$\text{Density}\left(\mathrm{g}/{\mathrm{cm}}^3\right)=\frac{\text{Mass}\left(\mathrm{g}\right)}{\text{Volume}\left({\mathrm{cm}}^3\right)}\text{or}\frac{Mass\left(\mathrm{g}\right)}{\text{Volume}\left(\mathrm{mL}\right)}$

To begin, determine the volume of a cube of lead and aluminium as follows:

Lead:

Aluminum:

Change the volume unit from gallons to liters${\mathrm{cm}}^3$to $\mathrm{mL}$as follows:

role="math" localid="1651700647045" $$\begin{gathered} 1.0c{m}^3=1.00mL \\ 8.0c{m}^3×\frac{1.00mL}{1.0c{m}^3} \\ =8.0mL \end{gathered}$$

Because lead and aluminum have a higher density than water, they will sink in it, and the volume of water will increase by the same amount as the volume of each block.

As a result, calculate the new cylinder volume as follows:

$Newvolume=watervolume+volumeoflead$

$$\begin{gathered} =40.0mL+8.0mL \\ =48.0mL \end{gathered}$$

With aluminum cube:

Hence the new level in both cylinders is $48.0\mathrm{mL}$