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  2. Isotopes of uranium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_uranium

    Uranium (92 U) is a naturally occurring radioactive element (radioelement) with no stable isotopes. It has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives and are found in appreciable quantity in Earth's crust. The decay product uranium-234 is also found. Other isotopes such as uranium-233 have been produced in ...

  3. Union Pacific 9000 Class - Wikipedia

    en.wikipedia.org/wiki/Union_Pacific_9000_Class

    The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built. Under the Whyte notation for the classification of steam locomotives, the locomotives had four leading wheels, twelve coupled driving wheels, and two trailing wheels. As the Union Pacific was the only operator of this wheel ...

  4. 2-6-8-0 - Wikipedia

    en.wikipedia.org/wiki/2-6-8-0

    [3] [4] This unusual wheel arrangement was the subject of some experimentation. The Erie Railroad briefly had a locomotive of this type numbered 2900, but it was rebuilt to a 2-8-0 in 1916 after only six years. The Baldwin Locomotive Works marketed a front end "kit" whereby conventional 2-8-0 locomotives could be converted to 2-6-8-0 types ...

  5. 4-6-2+2-6-4 - Wikipedia

    en.wikipedia.org/wiki/4-6-2+2-6-4

    2-6-2+2-6-2. Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-6-2+2-6-4 is a Garratt or Union Garratt articulated locomotive using a pair of 4-6-2 engine units back to back, with the boiler and cab suspended between them. The 4-6-2 wheel arrangement of each engine unit has four leading wheels, six ...

  6. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  7. 2-4-6-2 - Wikipedia

    en.wikipedia.org/wiki/2-4-6-2

    2-4-6-2. A 2-4-6-2 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a two-wheel leading truck, one set of four driving wheels, one set of six driving wheels, and a two-wheel trailing truck. This most unusual wheel arrangement was only ever used on the PLM 151.A class [fr], a French duplex locomotive type ...

  8. 2-6-2+2-6-2 - Wikipedia

    en.wikipedia.org/wiki/2-6-2+2-6-2

    2-6-0+0-6-2. Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-6-2+2-6-2 is an articulated locomotive using a pair of 2-6-2 power units back to back, with the boiler and cab suspended between them. The 2-6-2 wheel arrangement has a single pair of leading wheels in a leading truck, followed by three ...

  9. 2-4-6-8 Motorway - Wikipedia

    en.wikipedia.org/wiki/2-4-6-8_Motorway

    Release and reception. "2-4-6-8 Motorway" was originally released on 7 October 1977 and immediately attracted attention. It rose to No. 5 in the UK Singles Chart on 22 October 1977, and stayed on the chart for 9 weeks. [3] This is Robinson's highest charting single; his later (solo) single "War Baby" reached No. 6.