According to Equation 20.7, an ac voltage V is given as a function of time t by

Question:

According to Equation 20.7, an ac voltage V is given as a function of time t by V = V0 sin 2πft, where V0 is the peak voltage and f is the frequency (in hertz). For a frequency of 60.0 Hz, what is the smallest value of the time at which the voltage equals one-half of the peak value?