更新1:
re:機智天龍 我係指打出去個波識轉彎.....唔係'自轉' 球移動gei軌跡唔係直線, 而係曲線 (唔計上下移動) let say 由天空vertically望落地下, 個波如果冇加旋轉就會見到係直線, 而加o左旋轉gei話會見到曲線. y is that?
為什麼球會轉彎?
回答 (3)
2007-05-21 10:45 pm
'因為佢地都係球體!!!'
球體跟轉彎有什麼關係?飛機都會轉彎,但不是球體.
球體跟轉彎有什麼關係?飛機都會轉彎,但不是球體.
2007-05-11 2:38 am
將一透明吸管一半插入水內,在外面管口處沿水平方向用另一吸管大力吹氣則見插入水的吸管內水面升高.我們常見的玻璃清潔液之類的噴嘴即用此原理做成.在流體力學理論中,流體的速度大則壓強小,因而管內水面上升.
球在向前進,如果球左邊向前轉(即右邊向後轉),則空氣對球左面相對速度大("風速"+滾速),對球右面相對速度小("風速"-滾速),依上述原理球左面空氣壓力強度小,故球向左轉彎,向右如此類推.
球在向前進,如果球左邊向前轉(即右邊向後轉),則空氣對球左面相對速度大("風速"+滾速),對球右面相對速度小("風速"-滾速),依上述原理球左面空氣壓力強度小,故球向左轉彎,向右如此類推.
2007-05-10 10:25 pm
when a spherical object is self-spinning, it would drag the surrounding air.
So that the airflow on one side of the spherical object would be faster than the airflow on the other side.
by Bernoulli's equation, the higher the velocity of the fluid the lower is the pressure. the air pressure difference across the 2 sides of the spherical object would produce a net force on the object, which is perpendicular to the motion of the object to deflect it. and a curvature pathway is produced.
So that the airflow on one side of the spherical object would be faster than the airflow on the other side.
by Bernoulli's equation, the higher the velocity of the fluid the lower is the pressure. the air pressure difference across the 2 sides of the spherical object would produce a net force on the object, which is perpendicular to the motion of the object to deflect it. and a curvature pathway is produced.
收錄日期: 2021-04-29 22:49:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070510000051KK01246