In a department store, an air stream from a hose connected to the exhaust of a vacuum cleaner blows upward at an angle and supports a beach ball in midair. Which is more effective in keeping the ball up—air blowing across the top or air blowing across the bottom of the ball?
To identify: Whether the air blowing across the top or air blowing across the bottom of the ball is more effective in keeping the ball up.
Answer to Problem 48A
The air blowing across the top of the ball will keep the baseball up in the air.
Explanation of Solution
Introduction:
An object rises in the air when the pressure inside is greater than the surrounding air pressure.
When an airstream blows out of the exhaust, then the pressure inside the hose pipe of the vacuum cleaner will blow the air out of it speedily. When the beach ball is placed on the top of the air stream out of the hose pipe, then the beach ball will rise. But, it will stable in the midair because the air across the top of the ball will exert pressure above the ball to go down.
Conclusion:
Thus, the air blowing across the top of the ball will keep the baseball up in the air.
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