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  2. Twin and earth - Wikipedia

    en.wikipedia.org/wiki/Twin_and_earth

    'Twin and Earth' electrical cable to British Standard 6004, with twin 6 mm² conductors and uninsulated 2.5 mm² earth continuity conductor. Twin and earth (often written "T&E" and sometimes "T and E") cable is a colloquial name in the UK, Australia, New Zealand and other countries for a type of flat sheathed fixed mains electricity cable, containing two insulated current-carrying conductors ...

  3. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Benjamin Franklin — George Washington The First U.S. Postage Stamps, issued 1847. The first stamp issues were authorized by an act of Congress and approved on March 3, 1847. [20] The earliest known use of the Franklin 5¢ is July 7, 1847, while the earliest known use of the Washington 10¢ is July 2, 1847.

  4. Coins and postage stamps of Sealand - Wikipedia

    en.wikipedia.org/wiki/Coins_and_postage_stamps...

    Sealand began commissioning coins in 1972. The first to be minted was a SX$10 coin with a mintage of 2000. More coins were minted in 1975 and 1977, introducing the SX$20 and SX$100 coins. The SX$10 was minted in 925‰ fine silver, the SX$20 was minted in silver, and the SX$100 was minted in 900‰ fine gold . In 1991 the "Sealand rebel ...

  5. Portland, Oregon - Wikipedia

    en.wikipedia.org/wiki/Portland,_Oregon

    Portland (/ ˈ p ɔːr t l ə n d / PORT-lənd) is the most populous city in the U.S. state of Oregon, located in the Pacific Northwest region. Situated in the northwestern area of the state at the confluence of the Willamette and Columbia rivers, it is the county seat of Multnomah County, Oregon's most populous county.

  6. Ship - Wikipedia

    en.wikipedia.org/wiki/Ship

    Ship pollution is the pollution of air and water by shipping. It is a problem that has been accelerating as trade has become increasingly globalized, posing an increasing threat to the world's oceans and waterways as globalization continues. It is expected that "shipping traffic to and from the United States is projected to double by 2020."

  7. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    The figures cited in the tables are representative of the series, and are generally the latest, or most common, figures for a given coin type. The largest coin ever minted by the US Mint was the 2019 Apollo 50th anniversary 5ounce silver dollar, weighing 155.517 grams, and 76.2 mm in diameter. [5]

  8. Sea state - Wikipedia

    en.wikipedia.org/wiki/Sea_state

    Sea State 5 and 8 range. In oceanography, sea state is the general condition of the free surface on a large body of water—with respect to wind waves and swell —at a certain location and moment. A sea state is characterized by statistics, including the wave height, period, and spectrum. The sea state varies with time, as the wind and swell ...

  9. Escape velocity - Wikipedia

    en.wikipedia.org/wiki/Escape_velocity

    Earth. For example, at the Earth's surface, the surface gravity is about 9.8 m/s 2 (9.8 N/kg, 32 ft/s 2), and the escape speed for a small object is about 11.186 km/s (40,270 km/h; 25,020 mph; 36,700 ft/s). This is approximately 33 times the speed of sound (Mach 33) and several times the muzzle velocity of a rifle bullet (up to 1.7 km/s). At ...

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