« on: 31/12/2017 20:51:54 »
Just wondering why, on Earth, this thread is in "Plant Sciences, Zoology & Evolution" ?
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...After exercising on my Swiss Ball (on carpet), I stand up and after a few seconds the ball starts to roll. The floor is level. Any hypotheses?
The weight of the air-valve will give it a bias ...
Hello. My name is Holger Babinski and I'm professor of aerodynamics in the engineering department of Cambridge University. How much friction you need to compensate for the fact that the air is cold around you, depends very much on the temperature difference between your body temperature and the air temperature. You asked how fast you would have to cycle, so I shall assume that you're cycling at sea level. There, the surrounding temperature on a cold day might be something like 17 degrees. And in order to generate enough friction to bring the air up to body temperature, you have to cycle at about 63% of the speed of sound. With the speed of sound at sea level, that is pretty much 480 miles per hour. So you have to be pretty fast to achieve that. "
depends on some Naked Scientist making a credible invitation to the CSER.