Recently added articles: Stellar parameters, rowing boats, water propelled rockets.

Recently added material in ScienceBits includes:
  • Estimate the basic stellar parameters using the tendency for energy equipartition. In particular, the temperature at the center of the sun, the mass-radius relationship of white dwarfs and their Chandrasekhar limit are all estimated. These were taken from my order-of-magnitude course notes.
  • Row Row Row your boat, but at which maximum speed? This is a classic example of an order of magnitude analysis giving a lot of physical insight (and impressive predictive power).
  • Analysis of the classic homemade water rocket, taken straight out of my first year physics majors classical mechanics notes. There is even a rocket simulator with which the trajectory can be calculated and graphed.

Recently added articles: (1) On Global Warming (2) Snow above freezing

Recently added material in ScienceBits includes:

Bone Age

My almost 3 year old daredevil son broke his hand in his last escapade. I found the x-ray rather cute, and interesting... you can see how his bones are forming. He learned not to jump from high places, and I learned all about bone age...

Shas and Shinui Knesset Parties as the Lotka-Volterra equation

The demise of Shinui party in the last Israeli parliamentary elections (March 2006), made me realize that Shas and Shinui should probably follow the Lotka-Volterra equation. As I explain below, the problems are not totally equivalent for several reasons. Nonetheless, many of the L-V elements exist in the Shas/Shinui pray/predator system...