A single-degree-of-freedom system experiences the periodic excitation in Fig. 1. The excitation is constant for time intervals of duration T/2 followed by time intervals also of duration T/2 during which the excitation is off. Answer the following questions: 1. Determine the expressions of the coefficients of the normalized Fourier series representation F(1) ao Fo 2 + 8 00 ap cos pwot + b, sin pwot p=1 p=1 Activate Window(1) Go to Settings to activate V F(t) T Fo Figure 1: Periodic excitation applied to a single-degree-of-freedom system.