Final answer:
The affirmative response to the question about plotting the root locus for a unity feedback system using rlocus(sys) is True, and this is a concept in control systems engineering. Additionally, an isolated system is one where the net external force is zero, indicating no exchange with the environment.
Step-by-step explanation:
The question deals with the concept of a unity feedback system and the plotting of root locus using the function rlocus(sys). In the context of control systems engineering, the root locus is a graphical method for examining how the roots of a system change with changes in a certain system parameter, often a gain within the system.
To answer the original question, it's True that you can plot the root locus of a unity feedback system given the open loop transfer function using the function rlocus(sys) in MATLAB or any similar software that includes this function. This function computes and plots the root locus of the transfer function, providing valuable insight into the system stability and performance as parameters vary.
As for the separate information referenced about an isolated system, the correct definition is b. A system in which the net external force is zero. This means that no matter and energy enter or exit the system, thus the system is not influenced by external forces and does not exchange heat or work with its surroundings. It's crucial to differentiate between internal and external forces when discussing isolated systems.