A physical parameter $U$ is defined as:

$U=\frac{u}{ER}$

It is given that $=0\mathrm{.}0400Pa*s,u=11\mathrm{.}54\frac{m}{s},E=2\mathrm{.}30{10}^{11}Pa$ and $R=0\mathrm{.}0200m.($Note: $Pa$ is the unit of pressure. $1Pa=1\frac{N}{m^2})q,$

The magnitude of $U$ is:

$($a$)0\mathrm{.}80{10}^{-10},$

$($b$)0\mathrm{.}90{10}^{-10},$

$($c$)1\mathrm{.}00{10}^{-10},$

$($d$)1\mathrm{.}00{10}^{-9},$

The unit of the above parameter $U$ is:

$($e$)0\mathrm{.}1{10}^{-9}.q,$

$($a$)kg*\frac{m}{s^2},$

$($b$)\frac{m}{s},$

$($c$)$ Pa $,$

$($d$)$ Pa $*s,$

$($e$)1($unitless$).$