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  2. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    The electric current through a conductor between two points is directly proportional to the potential difference across the two points. optical tweezers An optomechanical device used for the capture, analysis, and manipulation of dielectric objects or particles, which operates via the application of force by the electric field of light.

  3. Electrical conductor - Wikipedia

    en.wikipedia.org/wiki/Electrical_conductor

    where is the length of the conductor, measured in metres [m], A is the cross-section area of the conductor measured in square metres [m 2], σ is the electrical conductivity measured in siemens per meter (S·m −1), and ρ is the electrical resistivity (also called specific electrical resistance) of the material, measured in ohm-metres (Ω·m ...

  4. Thermal conduction - Wikipedia

    en.wikipedia.org/wiki/Thermal_conduction

    [3] To quantify the ease with which a particular medium conducts, engineers employ the thermal conductivity , also known as the conductivity constant or conduction coefficient, k . In thermal conductivity , k is defined as "the quantity of heat, Q , transmitted in time ( t ) through a thickness ( L ), in a direction normal to a surface of area ...

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  6. These are some of the well-known landmarks damaged in the ...

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    This week’s deadly wildfires in Southern California have destroyed or damaged thousands of structures, including many landmarks that hold spots in cinematic and cultural history. The Los Angeles ...

  7. Ex-Google CEO Eric Schmidt says human operators need to ... - AOL

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    Former Google CEO Eric Schmidt says human-directed AI-controlled drones are the future of war. Schmidt's startup, White Stork, is developing drones for Ukraine to use in its war with Russia.

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