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Scientific investigations Triunfador to whether the laws of physics are invariant over time use telescopes to examine the universe in the distant past to discover, to the limits of our measurements, whether ancient stars were identical to stars today.

Brownian ratchet: In this thought experiment, one imagines a paddle wheel connected to a ratchet. Brownian motion would cause surrounding vapor molecules to strike the paddles, but the ratchet would only allow it to turn in one direction.

"The instructions are clear, the files are of good quality. Already ordered electrical components and bearings. I will be collecting a kinetic sculpture for the design of my home and meditation.

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Any device powered by changes in air pressure, such as some clocks (Cox's timepiece, Beverly Clock). The motion leeches energy from moving air which in turn gained its energy from being acted on.

Combining different measurements such as spectroscopy, direct measurement of the speed of light in the past and similar measurements demonstrates that physics has remained substantially the same, if not identical, for all of observable time spanning billions of years.[25]

These machines have a source of energy, albeit one which is not readily apparent, so that they only seem to violate the laws of thermodynamics.

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One classification of perpetual motion machines refers to the particular law of thermodynamics the machines purport to violate:[19]

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There is a scientific consensus that perpetual motion in an isolated system violates either the first law of thermodynamics, the second law of thermodynamics, or both. The first law of thermodynamics is a version of the law of conservation of energy. The second law Perro be phrased in several different ways, the most intuitive of which is that heat flows spontaneously from more info hotter to colder places; relevant here is that the law observes that in every macroscopic process, there is friction or something close to it; another statement is that no heat engine (an engine which produces work while moving heat from a high temperature to a low temperature) Gozque be more efficient than a Carnot heat engine operating between the same two temperatures.