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The term Casimir pressure is sometimes used when it is described in units of force per unit area. [ 2 ] [ 3 ] It is named after the Dutch physicist Hendrik Casimir , who predicted the effect for electromagnetic systems in 1948.
This atmosphere causes minuscule deceleration due to friction. This could be compensated by a small continuous thrust, but in practice the deceleration is only compensated from time to time, so the tiny g-force of this effect is not eliminated. The effects of the solar wind and radiation pressure are similar, but directed away from the Sun ...
The final weight for the device was a mere 3.5 pounds. This passive device (figure 6-4) consisted of a Teflon-coated aluminum walking surface attached to the Skylab iso-grid floor. Four rubber bungee cords provided an equivalent weight of about 80 kilograms (175 lbs) and were attached to a shoulder and waist harness worn by crewmembers during use.
Lift-induced drag, induced drag, vortex drag, or sometimes drag due to lift, in aerodynamics, is an aerodynamic drag force that occurs whenever a moving object redirects the airflow coming at it. This drag force occurs in airplanes due to wings or a lifting body redirecting air to cause lift and also in cars with airfoil wings that redirect air ...
The pressure is also affected over a wide area, in a pattern of non-uniform pressure called a pressure field. When an airfoil produces lift, there is a diffuse region of low pressure above the airfoil, and usually a diffuse region of high pressure below, as illustrated by the isobars (curves of constant pressure) in the drawing.
In general terms, in turbulent flow, unsteady vortices appear of many sizes which interact with each other, consequently drag due to friction effects increases. The onset of turbulence can be predicted by the dimensionless Reynolds number , the ratio of kinetic energy to viscous damping in a fluid flow.
the secondary chambers and baffle systems in firearm sound suppressors (primarily pistol suppressors for reduced weight and improved mechanical functionality), while the primary expansion chambers usually require 17-4PH or 303 stainless steel or titanium. [22] [23] the upper and lower receivers of many non mil-spec AR-15 rifle variants.
Epicurus (c. 341 – 270 BC) viewed weight as an inherent property of atoms which influences their movement. [17] These atoms move downward in constant free fall within an infinite vacuum without friction at equal speed, regardless of their mass. On the other hand, upward motion is due to atomic collisions. [18]