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  2. Length contraction - Wikipedia

    en.wikipedia.org/wiki/Length_contraction

    Using this method, the definition of simultaneity is crucial for measuring the length of moving objects. Another method is to use a clock indicating its proper time T 0 {\displaystyle T_{0}} , which is traveling from one endpoint of the rod to the other in time T {\displaystyle T} as measured by clocks in the rod's rest frame.

  3. Inverse-square law - Wikipedia

    en.wikipedia.org/wiki/Inverse-square_law

    In science, an inverse-square law is any scientific law stating that the observed "intensity" of a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity. The fundamental cause for this can be understood as geometric dilution corresponding to point-source radiation into ...

  4. Electrical length - Wikipedia

    en.wikipedia.org/wiki/Electrical_length

    Electrical length is widely used with a graphical aid called the Smith chart to solve transmission line calculations. A Smith chart has a scale around the circumference of the circular chart graduated in wavelengths and degrees, which represents the electrical length of the transmission line from the point of measurement to the source or load.

  5. Electricity - Wikipedia

    en.wikipedia.org/wiki/Electricity

    Electric utilities measure power using electricity meters, which keep a running total of the electric energy delivered to a customer. Unlike fossil fuels , electricity is a low entropy form of energy and can be converted into motion or many other forms of energy with high efficiency.

  6. Quarter-wave impedance transformer - Wikipedia

    en.wikipedia.org/wiki/Quarter-wave_impedance...

    Quarter-wave transformers are illustrated in an impedance Smith chart. Looking towards a load through a length l of lossless transmission line, the normalized impedance changes as l increases, following the blue circle. At l=λ/4, the normalized impedance is reflected about the centre of the chart.

  7. Two-balloon experiment - Wikipedia

    en.wikipedia.org/wiki/Two-balloon_experiment

    As some germ cells grow, others shrink, and fluid flow between interconnected cells causes the shrinking (smaller) cell to undergo cell death while the larger cell eventually becomes an egg. Bio-physical models suggest that this process is effectively similar to the behavior of the balloons in the two-balloon experiment [ 9 ]

  8. Orders of magnitude (power) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(power)

    10 3: kilo-(kW) 1–3 × 10 3 W tech: heat output of a domestic electric kettle: 1.1 × 10 3 W tech: power of a microwave oven: 1.366 × 10 3 W astro: power per square meter received from the Sun at the Earth's orbit: 1.5 × 10 3 W tech: legal limit of power output of an amateur radio station in the United States up to 2 × 10 3 W

  9. File:World electricity generation by source pie chart.svg

    en.wikipedia.org/wiki/File:World_electricity...

    This file is translated using SVG <switch> elements. All translations are stored in the same file! Learn more. For most Wikipedia projects, you can embed the file normally (without a lang parameter). The Wikipedia will use its language if the SVG file supports that language. For example, the German Wikipedia will use German if the SVG file has ...