Wind Resistance and/or Wind Accumulative Value

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SUMMARY

This discussion focuses on calculating wind resistance for a car traveling at 65 mph, specifically examining the effects of a hollow cylinder mounted on the hood. The wind resistance experienced varies significantly based on the vehicle's shape, with examples like the Hummer H2 and Porsche G2 illustrating this difference. The airflow dynamics through the cylinder are influenced by Bernoulli's principle, which states that as the velocity of a fluid increases, its pressure decreases. This principle is crucial for understanding how air behaves when interacting with objects in motion.

PREREQUISITES
  • Understanding of basic physics concepts, particularly fluid dynamics.
  • Familiarity with Bernoulli's principle and its applications.
  • Knowledge of vehicle aerodynamics and how shape affects wind resistance.
  • Basic mathematical skills for calculating wind resistance and airflow.
NEXT STEPS
  • Research "Calculating drag coefficient for vehicles" to understand how different shapes affect wind resistance.
  • Study "Bernoulli's principle applications" to explore real-world scenarios involving fluid dynamics.
  • Learn about "Aerodynamic design principles" to improve vehicle efficiency.
  • Investigate "Wind tunnel testing methods" for practical applications in automotive design.
USEFUL FOR

Physics students, automotive engineers, and anyone interested in understanding the impact of wind resistance on vehicle performance.

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Homework Statement



I'm working on a project and my physics is a bit weak as I haven't done physics since High School and I needed to figure out wind resistance when traveling in a car at various speeds. For example: If you are traveling down the Interstate at 65mph, how much wind resistance will you incur? And let's say that the current natural wind velocity in either direction is zero. For a better example: Let's say I have a hollowed cylinder mounted on the hood of my car and I am traveling at 65 mph. How much wind velocity will go through that cylinder? And let's say the cylinder's interior diameter is 5 inches.


Homework Equations





The Attempt at a Solution

 
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Wind resistance will depend a lot on the shape and size of your car. A Hummer H2 and a Porsche G2 will experience rather different amount of resistance.

As for that cylinder, if the shape presents some resistance to the flow of air (which it will) then the air which does manage to get inside will be at a lower pressure but a higher velocity. This is described in http://en.wikipedia.org/wiki/Bernoulli's_principle

Now why would someone want to put an open cylinder on his car hood?
 

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