Question

If a block has the following dimensions and a density of 7,8 g/cm what is the masst?

L = 5.0 cm
W = 6.0 cm
H = 2.0 cm

Answer 1

The question requires us to calculate the mass of a block, given its density (7.8 g/cm~3) and dimensions (length = 5.0 cm; width = 6.0 cm and height = 2.0 cm).

Considering that the volume of the block can be calculated following the basic formula for volume (volume = length x width x height), we can obtain the volume of the object from the dimensions given and then use the definition of density to calculate the mass from the density and volume of the block.

First, we'll calculate the volume of the block:

`\begin{gathered} \text{Volume = length}*\text{ width }*\text{ height} \\ \text{Volume = }(5.0cm)*(6.0cm)*(2.0cm) \\ \text{Volume = 60 }cm^3 \end{gathered}`

Next, we must consider the definition of density (mass per volume of an object) to calculate the mass of the block:

`\begin{gathered} \text{density = }\frac{mass}{\text{volume}}\to\text{mass = density}* volume \\ \end{gathered}`
`\begin{gathered} \text{mass = (7.8g/}cm^3)*(60cm^3) \\ \text{mass = }468g \end{gathered}`

Therefore, the mass of the block is 468g.