Final answer:
A short transmission line for 60 Hz AC power generally refers to lines up to 80 kilometers in length, much shorter than the wavelength of 6000 km at this frequency.
Step-by-step explanation:
In terms of electrical engineering and physics, a short transmission line is generally considered to be one where the length is much shorter than the wavelength of the operating frequency. For a 60 Hz AC power transmission line, the wavelength is extremely large, approximately 6000 km. Seeing that, a line is termed 'short' if it is only a few kilometers long, typically up to 80 kilometers (50 miles). Within this range, the capacitive and inductive effects are minimal, so they are often ignored in the simplified electrical modeling of the line.