四、某一低通濾波器(Low-pass filter)之波德圖(Bode diagram)如圖 4 所 示。若輸入訊號u(t) = 6cos(0.5t) + 7sin(5000t)時,請由該圖直接估測其 近似之穩態輸出訊號 yss(t) =?並說明之。(15 分)
3. (10%) F= [x. y. z] is a three-dimensional vector. Please calculate the value of a surface integral ∫∫s [ F● n] dA. where S is a surface defined as x3 + y2 +z2 =9 and n is the normal vector of S.