Final answer:
The tension in power lines, which sailboats need to be aware of when passing underneath, is provided by the physical stretching of the cables. This tension is crucial for the stability of power lines and the safe passage of sailboats, especially considering mast height and environmental factors.
Step-by-step explanation:
When a sailboat is passing under power lines and bridges, you need to be aware of the mast height relative to the clearance of these obstacles. Additionally, it is important to understand what provides tension in the power lines you may encounter. The tension in power lines comes primarily from the physical stretching of the cables to maintain them in a taut condition between poles or towers. This tension all ows for the transmission of electrical power over long distances without significant sagging of the lines.
In a broader sense, awareness of the environmental and physical factors such as wind direction, wave height, and current strength is crucial for safe navigation. Other aspects like the varying bridge clearance heights and potential interference from power lines are critical considerations for a skipper during such maneuvers.
When a sailboat is passing under power lines and bridges, you need to be aware of the potential for electrical hazards. Power lines can carry high voltage electricity, and if the mast or other parts of the sailboat come in contact with the power lines, it can result in electrical shock or electrocution. Similarly, bridges may have overhead cables or other structures that can pose a safety hazard if the sailboat's mast or rigging comes in contact with them.