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2. M1918 Browning automatic rifle - Wikipedia

   en.wikipedia.org/wiki/M1918_Browning_Automatic_Rifle

   The Browning automatic rifle (BAR) is a family of American automatic rifles and machine guns used by the United States and numerous other countries during the 20th century. . The primary variant of the BAR series was the M1918, chambered for the .30-06 Springfield rifle cartridge and designed by John Browning in 1917 for the American Expeditionary Forces in Europe as a replacement for the ...

3. Archimedes' principle - Wikipedia

   en.wikipedia.org/wiki/Archimedes'_principle

   The weight of the object in the fluid is reduced, because of the force acting on it, which is called upthrust. In simple terms, the principle states that the buoyant force (F b) on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume (V) times the gravity (g) [1] [3]

4. Displacement (fluid) - Wikipedia

   en.wikipedia.org/wiki/Displacement_(fluid)

   The increase in weight is equal to the amount of liquid displaced by the object, which is the same as the volume of the suspended object times the density of the liquid. [ 1 ] The concept of Archimedes' principle is that an object immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object. [ 2 ]

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6. Traction (mechanics) - Wikipedia

   en.wikipedia.org/wiki/Traction_(mechanics)

   A 70-ton M1A2 would sink to the point of high centering if it used round tires. The tracks spread the 70 tons over a much larger area of contact than tires would and allow the tank to travel over much softer land. In some applications, there is a complicated set of trade-offs in choosing materials.

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