![]() ![]() In other collective spinning systems, however, the number of constituent particles may be smaller and the particles relatively larger, such as an atomic nucleus made of a few dozen protons and neutrons. Such experiments have helped researcher develop models for rotational distortions applicable to these systems. To understand the resulting shapes, researchers need model systems able to mimic these effects.Įxperiments with spinning liquid droplets have provided information on the case where the constituent particles (molecules) are numerous and extremely small compared with the composite object, a regime known as the continuum limit. The shape of a spinning object is generally determined by a balance between the cohesive forces that hold it together and the centrifugal forces that tend to pull it apart. These particle clumps offer a means to probe rotational distortion under a wide range of conditions. Now researchers have devised a way to study this process using a spinning collection of tiny, levitated plastic particles. The rapid spinning of an object such as a black hole, asteroid, or atomic nucleus causes its shape to become distorted and can even cause it to be torn apart. (Particle diameter is about 190 micrometers video slowed down up by 100 times.) ![]() Under the influence of sound waves, plastic particles gradually rise and assemble into a rotating clump.
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