A structural I beam is made of steel. A view of its cross$-$section and its dimensions are shown in Figure P$1\mathrm{.}11.$ The density of steel is $7\mathrm{.}56{10}^{3}k\frac{g}{m^3}.$

Figure P$1\mathrm{.}11$

$($a$)$ What is the mass of a section $1\mathrm{.}50m$ long?

$kg$

$($b$)$ Assume that the atoms are predominantly iron, with atomic mass $55\mathrm{.}9u.$ How many atoms are there in this section?

atoms

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