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The refractive index of air is approximately 1.0003. [64] Denser media, such as water, [65] glass, [66] and diamond, [67] have refractive indexes of around 1.3, 1.5 and 2.4, respectively, for visible light. In exotic materials like Bose–Einstein condensates near absolute zero, the effective speed of light may be only a few metres per second.
The following is a list of speed records for various types of vehicles.This list only presents the single greatest speed achieved in each broad record category; for more information on records under variations of test conditions, see the specific article for each record category.
The seemingly impossible goal of accelerating the probe to 1% of lightspeed is realized through her idea of lining up ICBMs, Topol and Dongfeng missiles to launch the probe using nuclear pulse propulsion. The Planetary Defence Council (PDC) at first rejects the plan because of the high intercept speed and the unlikelihood of being able to ...
The X-15 had an ejection seat designed to operate at speeds up to Mach 4 (4,500 km/h; 2,800 mph) and/or 120,000 feet (37 km) (23 miles) altitude, although it was never used during the program. [12] In the event of ejection, the seat was designed to deploy fins, which were used until it reached a safer speed/altitude at which to deploy its main ...
The wings on the 777 feature a supercritical airfoil design that is swept back at 31.6 degrees and optimized for cruising at Mach 0.83 (revised after flight tests up to Mach 0.84). [148] The wings are designed with increased thickness and a longer span than previous airliners, resulting in greater payload and range, improved takeoff performance ...
[1] [2] For instance, Edwards replaced Einstein's postulate that the one-way speed of light is constant when measured in an inertial frame with the postulate: The two-way speed of light in a vacuum as measured in two (inertial) coordinate systems moving with constant relative velocity is the same regardless of any assumptions regarding the one ...
A 1% rate reduction can translate to paying tens of thousands of dollars less in three key ways: It reduces your interest charges, which are the most expensive part of your mortgage repayment.
where a 0 is 1,225 km/h (661.45 kn) (the standard speed of sound at 15 °C), M is the Mach number, P is static pressure, and P 0 is standard sea level pressure (1013.25 hPa). Combining the above with the expression for Mach number gives EAS as a function of impact pressure and static pressure (valid for subsonic flow):