Examlex
The critical mass density of the universe today is 9.5 *10 - 27 kg/m3.Using (only) the currently observed amount of luminous matter, what would be the average mass density in the universe? If protons were spread evenly throughout the universe, what would be their typical separation? (Note that the typical separation between protons would be roughly equal to the cubic root of the average volume occupied by one proton, and the mass of a proton is 1.67 *10 - 27 kg.)
Iron Core
An iron core is a ferromagnetic material used in electrical transformers and inductors to concentrate magnetic flux and improve their efficiency.
Electro-magnet
A magnet created by an electric current passing through a coil surrounding a metal core.
Movable Part
A component within a mechanism that changes position or operates dynamically to perform a specific function.
Relay
A relay is an electromechanical switch used in electrical circuits to control a high-power or high-voltage load with a small input signal, often utilized for safety and control purposes.
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