Bernoulli Application: Explaining How a Dime Blows Across a Table

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Blowing across a dime creates a pressure difference due to the Bernoulli principle, which states that an increase in the speed of fluid (air) results in a decrease in pressure. As air is blown across the dime, the pressure on the top surface decreases, allowing the higher pressure beneath to push the dime upward and forward. The equation (qv^2)/2 + qgh + p = constant illustrates the relationship between velocity, height, and pressure in this scenario. The cross-sectional profile of the dime affects how air flows around it, influencing the pressure experienced on its surface. Understanding these dynamics clarifies how the dime can be moved into a cup with a simple blow.
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Homework Statement



With a little effort we can blow across a dime on a table and make it land in a cup, but how can it be explained? I know that is because the bernoulli princle
(qv^2)/2 +qgh + p = const

Homework Equations



but what happens with pressure during this action?
 
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alik said:

Homework Statement



With a little effort we can blow across a dime on a table and make it land in a cup, but how can it be explained? I know that is because the bernoulli princle
(qv^2)/2 +qgh + p = const

Homework Equations



but what happens with pressure during this action?

the dime has a cross sectional profile, the side your blowing experiences a pressure equal to the first term in your equation
 

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