I had read this question on a quiz on my morning paper, but i wasnt able to follow-up the answer the next morning. could someone answers this, please?
Heres the question:
Is a sailboat being pulled off or being pushed by the wind?
2007-11-03 04:01:38 · 3 answers · asked by Prett 1 in Science & Mathematics ➔ Physics
Pushed. Technically, gas (like wind) cannot support tension like a solid (like rope) can, only positive pressure. "Suction", for example, is due to a pressure imbalance (the pressure on the opposite side is simply higher).
2007-11-03 04:27:32 · answer #1 · answered by Dr. R 7 · 0⤊ 0⤋
Either, depending on its direction relative to the wind and its sail trim angle. Let's say "pulling" is the effect of lift on the forward surface, and "pushing" is the effect of drag on the aft surface. If the sail angle is at 90 deg to the fore-aft axis and the wind is from the stern, it's pushing. If with about the same sail trim the wind is from the side, it's primarily pulling. And when the boat is beating (heading nearly into the wind) and the sail is close-hauled, it's pulling. Here the pull is mostly sideways and some forward, but the keel or centerboard reduces the sideways travel.
2007-11-03 04:17:35 · answer #2 · answered by kirchwey 7 · 0⤊ 1⤋
an exciting theory - yet you anticipate that's the salt water it somewhat is the source of the battery's power. in actuality, in maximum batteries that's the anode and cathode - to that end the steel and aluminum - that are the easily source of the ability. The salt water is the electrolyte - the medium that the metals act by way of to replace ions. After a time, the metals might corrode away, and the battery might fail.
2016-12-30 16:24:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋