Problem 43. A string of impedance Z1=0.2 kg/s is joined to a second string of impedance Z2. The strings are along the z-direction and an incident wave y1= (0.4 m)

cos((2 (200)/s) t – kị z) is launched in string one moving towards positive z and towards the junction of the two strings. Find Z2 if 30% of the incident power is reflected and the reflected wave has the same orientation as the incident wave. ) Find Z2 if 30% of the incident power is reflected and the reflected wave is inverted relative to the incident wave. 3) Find the voltage (as a function of time) across an 20-µH inductor when the current through the inductor is