Aflat circular plate of copper has a radius of 0.379 m and a mass of 71.4 kg. what is the thickness of the plate? answer in units of m.

We use the formula,

.

Here, m is mass, V is the volume and is density.

We can also write above equation as,

.

Here, ,  t is thickness circular plate of copper.

Given and .

The  density of copper = 8.94 g/ cm³.

Substituting these values in above formula we get,

.

Thus, the thickness of the plate is  0.0178 m.