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For very small buildings, contractors normally estimate the capacity and type of system needed and then design the system, selecting the appropriate refrigerant and various components needed. For larger buildings, building service designers, mechanical engineers, or building services engineers analyze, design, and specify the HVAC systems ...
Doppler effect. The emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h). This is only a component of the real speed (170 km/h). The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference ...
The Franck–Hertz experiment was the first electrical measurement to clearly show the quantum nature of atoms, and thus "transformed our understanding of the world". [ 1 ] It was presented on April 24, 1914, to the German Physical Society in a paper by James Franck and Gustav Hertz. [ 2 ][ 3 ] Franck and Hertz had designed a vacuum tube for ...
Once relocated to Philly, "my father would get trailer loads of watermelon," Joshua Carter said. It was a way to make extra money for the family of 12, and in this section of the city, a fresh ...
Harris will travel to Raleigh, North Carolina, a state Democrats remain hopeful they can flip this election, to outline a plan "to lower costs for middle-class families and take on corporate price ...
Sitting in the noisy dayroom of Mule Creek State Prison in Ione, Calif., as he speaks over a grainy video call, Scott Peterson looks more like a laidback surfer than a man convicted of the heinous ...
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