File:Bowlingball3.gif
Bowlingball3.gif (300 × 181 pixels, file size: 439 KB, MIME type: image/gif, looped, 104 frames, 10 s)
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Summary
DescriptionBowlingball3.gif |
English: Bowling ball spin-up (with horizontal speed-reduction) between black dots i.e. a delivery that starts the ball in a skid which evolves into a roll. After spin-up the speed levels out as static-friction takes over, which in turn may allow side-roll to hook the ball into the pins. This provides a practical and visceral example of (i) angular-acceleration accompanied by translational-deceleration, (ii) kinetic versus static friction, as well as (iii) the rolling-constraint. The frame-residuals also make screen-captures useful for practicing Bayesian inference of a ball's properties from observational data. |
Date | |
Source | Own work |
Author | P. Fraundorf |
Sample puzzler
False-vacuum adventure: As a hot-shot investigator for the United Nations Space Command, you are given the job of checking if a false-vacuum[1][2][3] has been smuggled into the solar-system in a shipment of bowling balls. All balls weigh the same amount but by video-taping each ball in use at the local bowling alley, can you determine which (if any) of the balls is hollow without perturbing the false vacuum or letting it out?
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Footnotes
- ↑ According to Alan Guth and other proponents of cosmic-inflation, false vacuums are capable of radically reconfiguring whole universes in the blink of an eye.
- ↑ A. H. Guth (1981) "The inflationary universe: A possible solution to the horizon and flatness problems", Phys. Rev. D 23, 347.
- ↑ Ta-Pei Cheng (2005/2010) Relativity, gravitation and cosmology: A basic introduction (Oxford U. Press, Oxford/NY) link.
Items portrayed in this file
depicts
some value
24 March 2012
image/gif
464d42d2c12a7d134e64cb24575d23110a14ce0d
449,753 byte
10.399999999999979 second
181 pixel
300 pixel
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:38, 8 April 2012 | 300 × 181 (439 KB) | Unitsphere |
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