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Ernst Mach was born on February 18, 1838 and died on February 19, 1916. Ernst Mach would have been 78 years old at the time of death or 177 years old today.
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Newton was more into light. Ernst Mach was the sound guy. Mach being the speed of sound.
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John T. Blackmore has written:
'Ernst Mach's Prague 1867-1895' -- subject(s): Philosophers, Physicists, Science, Philosophy, Biography, History
'Ernst Mach; his work, life, and influence'
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Erik C. Banks has written:
'Ernst Mach's world elements' -- subject(s): Metaphysics, Psychophysics, Contibutions in physics
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Ernst Mach is best known for an 1877 paper on supersonic velocity in which he gave his name to the ratio of an object's speed to the speed of sound (an object moving at the speed of sound is at Mach 1). He worked in electricity, optics, acoustics and mechanics as a professor of physics, mathematics and philosopher in Graz, Prague and Vienna, and earned a reputation as an expert experimenter and lucid writer. A critic of Isaac Newton's model of a mechanistic universe, Mach argued that all knowledge was based on sensation, and that all scientific measurements were dependent upon the observer's perception. His scientific work influenced Albert Einstein, and his metaphysical writings influenced positivist philosophers such as Bertrand Russell. Mach's books include The Development of Mechanics (1883), The Analysis of the Sensations (1886) and Knowledge and Error (1905).
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Mach refers to the speed of sound. A plane that travels at Mach 2 means that it travels twice the speed of sound in air. The actual speed will vary a bit depending on the altitude.
Mach number is a measure of relative speed. It is the speed of something relative to a medium, usually air, and divided by the speed of sound in that medium: : : is the Mach number : is the velocity of the object relative to the medium used and : is the velocity of sound in the medium Mach number is the number of times the speed of sound an object or a duct, or the fluid medium itself, move relative to each other. It is named afteran Austrian physicist Ernst Mach.
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The mach number is the speed, compared to the speed of sound in air. Thus, mach 1 is the speed of sound, mach 2 is twice (2 times) the speed of sound, mach 3 is 3 times the speed of sound, etc.
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There is no plural for the noun 'mach'; the different levels of mach are usually shown by a numeral for various speeds, such as mach 1 or mach 2.
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Speeds faster than Mach 1 are measured in multiples of Mach, such as Mach 2 (twice the speed of sound), Mach 3 (three times), and so on. Each Mach number represents the speed of an object in relation to the speed of sound.
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ernist mach
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Well, not quite. Ernst Mach was a well-known Austrian physicist, for sure. About 10 years before faster-than-sound (super - sonic) aircraft were perfected, the issue of supersonic travel was being studied. An aeronautical engineer by the name of Jakob Ackeret proposed that the unit of speed of sound be named after Ernst Mach. And so it was. (Many physical units are named after famous scientists, like Volta, Coulomb, Alex Bell [deciBel] Ohm, Ampere, Hertz, and so on. Units like this are spelled and even abbreviated using a capital initial letter.)
Meanwhile . . . in the 1870s and 1880s, a French scientist by the name of Emile Sarrau was experimenting with the speeds at which various explosions occurred. It was important, as at that time Alfred Nobel , Sarrau, and others were attempting to create more powerful explosions for use in war and quarrying. The outgoing speed of an explosion was a good measure of its power.
Anyway, the French named the speed of sound after Sarrau, and they call it now, the "Sarraut number".
Unlike almost all other units of measure, the Mach number is not absolute, but changes with altitude and pressure. Also unlike conventional measuring units, like "2 inches", "60 mph, "115 lbs", the Mach number comes after the unit, as in, "Mach 1.5", "Mach 3", and so on.
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Mach 1 is 761.21 mph.
Use this equation to convert Mach to miles per hour: mach x 761.21 = mph
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Mach 1 (or the speed of sound) is 1,225km per hour
Mach 75 is there for 91,875 km/h
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Mach is the coefficient of the speed of sound, so Mach 1 means you are travelling at 1 x the speed of sound.
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If it is civil , its mach 1.- mach 2 ,name is Concorde & in defence they go beyond mach 2
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Critical Mach Number has nothing (directly) to do with altitude.
Mach Number has everything to do Temperature,
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