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  2. Mark 46 torpedo - Wikipedia

    en.wikipedia.org/wiki/Mark_46_torpedo

    A French Lynx. helicopter carrying a Mk 46 torpedo. The Mark 46 torpedo is the backbone of the United States Navy 's lightweight anti-submarine warfare torpedo inventory and is the NATO standard. These aerial torpedoes are designed to attack high-performance submarines. In 1989, an improvement program for the Mod 5 to the Mod 5A and Mod 5A (S ...

  3. Mk 48 machine gun - Wikipedia

    en.wikipedia.org/wiki/Mk_48_machine_gun

    Mk 48 Mod 1 US Air Force Staff Sergeant with the Mk 48 Mod 1 in Afghanistan, 2011. The Mk 48 Mod 1 is an update of the Mk 48 Mod 0, which is also made in FN-America. Like the Mod 0, it is essentially an M249 scaled up to fire the 7.62×51mm NATO round. The Mod 1 utilizes a 19.75-inch barrel, weighs in at 18.37 lb unloaded.

  4. 4-inch/50-caliber gun - Wikipedia

    en.wikipedia.org/wiki/4-inch/50-caliber_gun

    The ammunition was about 7 lb (3.2 kg) heavier than a 4-inch/40 caliber round. The Mod 1 was a Mod 0 that used a conical steel liner and the Mod 2 was either a Mod 0 or Mod 1 that was relined using a conical nickel-steel liner and a shoulder on the breech end. [3] Gun No. 353 was the prototype of the Mark 8 and was test fired on 22 September 1910.

  5. 5-inch/54-caliber Mark 42 gun - Wikipedia

    en.wikipedia.org/wiki/5-inch/54-caliber_Mark_42_gun

    The Mark 42 5"/54 caliber gun (127mm) is a naval gun (naval artillery) mount used by the United States Navy and other countries. It consisted of the Mark 18 gun and Mark 42 gun mount. United States naval gun terminology indicates the gun fires a projectile 5 inches (127.0 mm) in diameter, and the barrel is 54 calibers long (barrel length is 5 ...

  6. Quadratic reciprocity - Wikipedia

    en.wikipedia.org/wiki/Quadratic_reciprocity

    The former are ≡ ±1 (mod 5) and the latter are ≡ ±2 (mod 5). Since the only residues (mod 5) are ±1, we see that 5 is a quadratic residue modulo every prime which is a residue modulo 5. −5 is in rows 3, 7, 23, 29, 41, 43, and 47 but not in rows 11, 13, 17, 19, 31, or 37.

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    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  8. 4.5-inch Mark 8 naval gun - Wikipedia

    en.wikipedia.org/wiki/4.5-inch_Mark_8_naval_gun

    A new type of 4.5 inch gun with a longer 55-calibre barrel, it was designed in the 1960s for the Royal Navy's new classes of frigates and destroyers.The weapon, built by Vickers Ltd Armament Division, was developed by the Royal Armament Research and Development Establishment using the Ordnance, QF 105 mm L13 of the Abbot self-propelled gun as a starting point (it used electrical primers).

  9. Rogers–Ramanujan identities - Wikipedia

    en.wikipedia.org/wiki/Rogers–Ramanujan_identities

    Thus () gives the number of decays of an integer n in which adjacent parts of the partition differ by at least 2 and in which the smallest part is greater than or equal to 2 is equal the number of decays whose parts are equal to 2 or 3 mod 5. This will be illustrated as examples in the following two tables: