QUESTION $2$

For a wire with a diameter of $4\mathrm{.}00mm$ calculate the cross$-$sectional are in $m{m}^2.$ Report in scientific notation with correct significant figures.

QUESTION $3$

For a wire with a radius of $3\mathrm{.}000mm$ calculate the cross$-$sectional area in $m^2.$ Report in scientific notation with correct significant figures.

QUESTION $4$

A $235mm$ length of high tension cable has a mass of $90g.$ What is the mass per unit length in $k\frac{g}{k}m?$ Report with correct significant figures.