Wednesday, January 19, 2011

Activity 2 1-19-11 Weather and bernoulli Principle

Describe some common weather occurrences in relation to the gas laws and characteristics we have been exploring.

Humidity (water vapor lighter than air), Wind (Earth being heated by the Sun and the Earth’s surface is heated unevenly, when T get larger then P has to get smaller, so where ever the Earth’s surface gets heated the pressure falls and then the air needs to maintain the balance and this causes the air to move thus the wind.

 where there's moving air there's low pressure

What is the Bernoulli Principle, provide and example or application of this.

Place a ping pong ball into the opening of a small plastic funnel. Now blow through the small end to try to blow the ball out of the funnel. Any luck? Blow harder. Still no luck. OK bring out the big guns. Get a shop vacuum cleaner that can be hooked up backwards. Put the hose into the exhaust end so that it blows air out rather than sucks it in. That should blow the ball out. Stick the funnel tightly into the hose and try to blow that ball across the room. Won't work. The ball will bounce around a little but the blast of air will not be able to blow it out the large end of the funnel. Paradoxically the airstream that should blast the ball across the room seems to grasp it tightly into the funnel. So tightly that you can slowly turn the funnel upside down and watch that little ping pong ball seemingly defy gravity as well as the strong air blast. What's going on here?


Read more at Suite101: Bernoulli's Principle Examples: Airplane Wings and Curve Balls Use Bernoulli's Principle http://www.suite101.com/content/bernoullis-principle-examples-a15812#ixzz1BV49142a

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