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Q 6Q

Expert-verifiedFound in: Page 436

Book edition
9th Edition

Author(s)
Raymond A. Serway, John W. Jewett

Pages
1624 pages

ISBN
9781133947271

**Question:**** If the airstream from a hair dryer is directed over a table-tennis ball, the ball can be levitated. Explain.**

Partial vacuum will lift up the ball.

The sum of the pressure, kinetic energy per unit volume, and gravitational potential energy per unit volume has the same value at all points along a streamline for an ideal fluid. This result is summarized in Bernoulli’s equation:

P+$\frac{1}{2}\rho {v}^{2}+\rho gh=cons\mathrm{tan}t$

Where

P = Pressure of fluid

V = Volume of fluid

$\rho =$Density of fluid

h = Height of fluid in pipe

If the stream of air directed over the table tennis ball has very high velocity, it will create a low pressure over the table tennis ball, resulting in partial vacuum that will lift up the ball. This situation is based upon the application of Bernoulli’s principle.

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