A circuit consists of an AC source wired in series to a \(1000-\Omega\) resistor and a \(1.00-\mu \mathrm{F}\) capacitor. For a source emf amplitude \(\mathscr{E}_{\max }=35.0 \mathrm{~V}\), calculate the phase constant \(\phi\) and the amplitudes \(V_{C}\) and \(V_{R}\) if the source frequency is (a) 60 Hz and (b) 2100 Hz.