# numerical model

### Debris field for a broken meteor

I happened to catch two parts of two different episodes of Meteorite Men - a show about two guys that look for meteorites. In both of the snippets I saw, they were talking about a debris field for a meteor that breaks up. In these fields, the larger chunks of the meteorite are further down in the field. Why is this? Let me approach this first from a terminal velocity view. This requires a model for air resistance. I will use the following: Where: rho is the density of air A is the cross sectional area of the object C is a drag coefficient that depends on the shape of the object v is the…

### MythBusters - Testing Bullet Proof and Bullet Speeds

On MythBusters this week, Adam and Jamie tested the bullet-proofness of various objects. The one that sticks in my mind is the ipod. The said there was a report of a solider being shot by an AK-47, but he was saved because the bullet hit his ipod. To test this, Adam shot an AK-47 at an ipod and it went through. Their conclusion was that he was also wearing body armor. I am not sure I like that conclusion. Why would someone report that the ipod saved him if he was also wearing body armor? Maybe they would, but not sure. I was thinking, maybe the bullet went through the ipod because they…

### Physics of Linerider III: Air Resistance

There is no air resistance in line rider. Sorry to spoil the suspense. To test for the presence of an air resistance force, a track was created that let the rider fall. ![linerider air 1](http://scienceblogs.com/dotphysics/wp-content/uploads/2008/09/linerider…) (note the markers on the side. These are used to keep track of how the origin is moving). Below is the y position of the rider as a function of time: ![linerider falling](http://scienceblogs.com/dotphysics/wp-content/uploads/2008/09/linerider…) In this situation, the rider falls about 100 meters. A quadratic line is fit to the data…