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The wagon-wheel effect (alternatively called stagecoach-wheel effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true rotation, it can appear stationary, or it can appear to rotate in the opposite direction from the true rotation ...
The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...
In fluid mechanics, the Cheerios effect is a colloquial name for the phenomenon of floating objects appearing to either attract or repel one another. The example which gives the effect its name is the observation that pieces of breakfast cereal (for example, Cheerios ) floating on the surface of a bowl will tend to clump together, or appear to ...
The stroboscopic effect visibility meter can be applied for different purposes (see IEC TR 63158 [12]): Measurement of the intrinsic stroboscopic-effect performance of lighting equipment when supplied with a stable mains voltage; Testing the effect of light regulation of lighting equipment or the effect of an external dimmer (dimmer compatibility).
[citation needed] It may relate to the smallness of the coin – the small coin used as Maundy money after the 1820s. It may also relate to its relative rarity, being produced initially in 1797 as a very large "cartwheel" copper coin and thereafter only as Maundy money as a rare and very small silver coin, largely given away only by the monarch.
Coin magic is the manipulating of coins to entertain audiences. [1] Because coins are small, most coin tricks are considered close-up magic or table magic, as the audience must be close to the performer to see the effects. Though stage conjurers generally do not use coin effects, coin magic is sometimes performed onstage using large coins.
A variety of models for understanding insurgency and planning the counterinsurgency (COIN) response have been developed. One model that has become respected both in academic and military context is the "Magic Diamond" model developed by Gordon McCormick of the RAND Corporation. [1]
Coin manipulation is the art of manipulating coins in skillful flourishes, usually on or around the hands. [1] Although not always considered coin magic, the flourishes are sometimes used in magic shows. The difficulty of the trick ranges greatly, from some that take a few minutes to accomplish, to much more complex ones that can take months ...