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  2. G7e torpedo - Wikipedia

    en.wikipedia.org/wiki/G7e_torpedo

    Due to several problems, leading to the German "Torpedokrise" which lasted until the end of 1941, the improved G7e(TIII) took over as the standard electric torpedo used by German U-boats for the rest of the war. G7e torpedoes measured 533.4 mm (21.00 in) in diameter and about 7.2 m (24 ft) in length.

  3. G7 - Wikipedia

    en.wikipedia.org/wiki/G7

    The G7 affirmed to uphold "the free and open international order" based on "the rule of law", and strengthened the G7's outreach to the emerging and developing countries. [136] The long guest list reflects the attempts to woo what many call the "Global South", a term used for developing countries in Asia, Africa and Latin America, all of whom ...

  4. External ballistics - Wikipedia

    en.wikipedia.org/wiki/External_ballistics

    The G7 drag curve model prediction method (recommended by some manufacturers for very-low-drag shaped rifle bullets) when using a G7 ballistic coefficient (BC) of 0.377 yields very similar results in the supersonic flight regime compared to the Doppler radar test derived drag coefficients (C d) prediction method. At 1,500 m (1,640 yd) range the ...

  5. G7a torpedo - Wikipedia

    en.wikipedia.org/wiki/G7a_torpedo

    German G7a(TI) torpedo at the Norwegian Armed Forces Museum in Oslo. The G7a(TI) was the standard issue Kriegsmarine torpedo introduced to service in 1934. It was a steam-powered design, using a wet heater engine burning decaline, with a range of 7,500 metres (24,600 ft) at 40 knots (74 km/h; 46 mph) speed.

  6. 47th G7 summit - Wikipedia

    en.wikipedia.org/wiki/47th_G7_summit

    The 47th G7 summit was held from 11 to 13 June 2021 in Cornwall, England, during the United Kingdom's tenure of the presidency of the Group of Seven (G7), an inter-governmental political forum of seven advanced nations. [1] The participants included the leaders of the seven G7 member states, as well as representatives of the European Union.

  7. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  8. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence and environmental information? Inverse protein-folding problem: Is it possible to design a polypeptide sequence which will adopt a given structure under certain environmental conditions?

  9. List of undecidable problems - Wikipedia

    en.wikipedia.org/wiki/List_of_undecidable_problems

    For functions in certain classes, the problem of determining: whether two functions are equal, known as the zero-equivalence problem (see Richardson's theorem); [5] the zeroes of a function; whether the indefinite integral of a function is also in the class. [6] Of course, some subclasses of these problems are decidable.