$($a$)$ If $=70$ degrees, and the magnitude of the acceleration is $1\mathrm{.}8$e$+17$ m$/$s$2,$ what is the magnitude of $?$

m$/$s$2$

$($b$)$ What is the magnitude of the radiative electric field at the indicated observation location, if the magnitude of is $0\mathrm{.}013$ m$?$

N$/$C $($c$)$ What is the direction of the radiative electric field at the observation location?