. The following shows a feedback control system where the height of the tank is to be controlled. The fluid has density rho = 1 and take g = 9.81. This is a proportional feedback control system, with desired reference r and proportional gain 20. However, the measurement is transmitted over a network that causes a delay of Td seconds. Estimate the maximum delay that can be tolerated before the closed loop system becomes unstable. You will need to find the transfer function Y (s) U(s) (or equivalently H(s) Qin(s) ) and sketch the Bode plot to answer this question. A log scale is provided for your convenience, as is the impedance network for the tank.