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  2. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    For example, while sound travels at 343 m/s in air, it travels at 1481 m/s in water (almost 4.3 times as fast) and at 5120 m/s in iron (almost 15 times as fast). In an exceptionally stiff material such as diamond, sound travels at 12,000 m/s (39,370 ft/s), [ 2 ] – about 35 times its speed in air and about the fastest it can travel under ...

  3. Fast travel - Wikipedia

    en.wikipedia.org/wiki/Fast_travel

    Fast travel is usually performed from an in-game menu upon accessing either a map of the overworld or an object such as a vehicle or save point.The player is immediately transported from one location to another, sometimes with an appropriate amount of in-game time passing in between, as though they had traveled straight to their destination.

  4. 20 cm/50 3rd Year Type naval gun - Wikipedia

    en.wikipedia.org/wiki/20_cm/50_3rd_Year_Type...

    till 1934: 5 twin 7.9-inch type D 40° from 1934: 5 twin 8.0-inch type D 40° Takao-class heavy cruisers Takao, Atago, Chokai. 5 twin 8.0-inch type E 70° Maya. 5 twin 8.0-inch type E 55° Mogami-class heavy cruisers: Mogami, Mikuma, Kumano, Suzuya. till 1939: 5 triple 6.1-inch 55° (classified as light cruiser) from 1939: 5 twin 8.0-inch type ...

  5. Units of measurement in transportation - Wikipedia

    en.wikipedia.org/wiki/Units_of_measurement_in...

    kilogram-kilometre (kg⋅km), moving 1 kg of cargo a distance of 1 km;; tonne-kilometre or kilometre-tonne (t⋅km or km⋅t, also tkm or kmt), the transportation of one tonne over one kilometre; 1 tkm = 1,000 kgkm.

  6. Escape velocity - Wikipedia

    en.wikipedia.org/wiki/Escape_velocity

    Escape speed at a distance d from the center of a spherically symmetric primary body (such as a star or a planet) with mass M is given by the formula [2] [3] = = where: G is the universal gravitational constant (G ≈ 6.67×10 −11 m 3 ·kg −1 ·s −2)

  7. Container ship - Wikipedia

    en.wikipedia.org/wiki/Container_ship

    The steadily rising expense of fuel oil in the early 2010s had prompted most container lines to adapt a slower, more economical voyage speed of about 21 knots, compared to earlier top speeds of 25 or more knots. Subsequently, newly built container ships can be fitted with a smaller main engine.

  8. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at ⁠ c / 1.5 ⁠ ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

  9. Health and environmental impact of transport - Wikipedia

    en.wikipedia.org/wiki/Health_and_environmental...

    A European study of nearly 2000 participants showed that an average person cycling 1 trip/day more and driving 1 trip/day less for 200 days a year would decrease mobility-related lifecycle CO 2 emissions by about 0.5 tonnes over a year, representing a substantial share of average per capita CO 2 emissions from transport (which are about 1.5 to ...