在研究流体问题时,不少学生觉得了解物理情境容易,但又不能正确求解。为了帮助学生更好地处理这类问题,下面举例说明。一、流体中的机械能守恒例1一根全长为粗细均匀的铁链,对称地挂在轻小光滑的定滑轮上(如图),当受到轻微的扰动,铁链脱离滑轮瞬间的速度有多大?解:设铁链的总质 When studying the fluid problem, many students feel that understanding the physical situation is easy, but they can not be solved correctly. To help students deal with this type of problem better, here's an example. First, the conservation of mechanical energy in the fluid Example 1 An overall length of the uniform thickness of the chain, symmetrically linked to the light and smooth fixed pulley (pictured), when subjected to slight disturbances, the speed of the chain off the pulley moment How much solution: Set the total weight of the chain