Wednesday, July 01, 2009 The July stories are (1) the physics of tossing a pizza, including both the single-toss technique and the multiple-toss technique. (2) Dead water refers to a strange sea condition when a ship is stopped, even though it is at full power, the sea is calm, and there is neither wind nor current. What would it be like to swim across a region of dead water? (3) The pub trick of the month is about how to allow a ring to fall down a loop of string and end up tied in a ring hitch at the bottom. It is easy to do if you know how but stumps everyone else in the pub. The photograph here depicts part of the wrapping-up process. (4) Suppose you have two containers with equal amounts of water, and you heat one of them. Then you place both containers, one hot and one not hot, in a sub-freezing environment, either a freezer or outside on a cold night. Which will freeze first? Well, very surprisingly, the container that starts from the higher temperature can freeze first.


Blogger Chickpea said...

Has anyone ever tried the freezing water experiment with double distilled water? I wonder what the results would be...

Beachler, CSU Civil Engineering class of 2000 (never had you as a prof, but you saw me often and liked my periodic table of the elements t-shirt :)

11:44 PM  
Blogger Jearl Walker said...

They have but not in a convincing way. The experiment is very "slippery" because there are many variables to control. And yes, I remember the t-shirt.

9:06 PM  

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