please help A popular book Physics of Entertainment by Ya Perelman, describes an

Question

please help

A popular book Physics of Entertainment by Ya Perelman, describes and explains the following experiment: Figure depicts a small pith ball floating in a jet of air. The air strikes the ball and prevents it from falling. Meanwhile, should the ball pop aside, the outer air-whose pressure is greater since its velocity is smaller-returns it to the jet. The phenomenon described is true, however, what is the flaw in this argument? Explain with some physical insights and using fluid mechanics expressions.

Explanation / Answer

THough the phenomena is true,

Explaination should be force offered by fluid elements because of their change in momentum

If rate of change of momentum of Fluid elements > Weight of ball, then ball will have a net upward acceleration and

If rate of change of momentum of Fluid elements < Weight of ball, then ball will have a net downward acceleration

Expression:

http://www.ap.smu.ca/demos/index.php?option=com_content&view=article&id=111&Itemid=85

This can also be explained by Bernoulli's principle :

http://gizmodo.com/the-physics-of-how-a-water-jet-can-keep-a-ball-floating-1445828275

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