P$6\mathrm{.}67.$ Suppose we need a first$-$order highpass filter $($such as Figure $6\mathrm{.}19$ on page $309)$ to attenuate a $60-Hz$ input component by $60dB.$ What value is required for the break frequency of the filter? By how many $dB$ is the $600-Hz$ component attenuated by this filter? If $R=5k,$ what is the value of $C?$

P$6\mathrm{.}68.$ Consider the circuit shown in Figure P$6\mathrm{.}68$ Sketch the Bode magnitude and phase plots to scale for the transfer function $H(f)=\frac{V_{\text{o}\text{u}\text{t}}{?}_R}{V_{in}}={00}_{}.$