A block of solid iron sits on a flat, level shelf. Iron has a density of $7\mathrm{.}85103$ kg$/$m$3.$ The mass of the block is $23\mathrm{.}8$ kg$.$

$($a$)$

What is the volume of the block $($in m$3)?$

m$3$

$($b$)$

The amount of surface area of the block in contact with the shelf is $2\mathrm{.}13102$ m$2.$ What is the average pressure $($in Pa$)$ exerted on the shelf by the block?

Pa