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  2. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a ...

  3. Trireme - Wikipedia

    en.wikipedia.org/wiki/Trireme

    The trireme derives its name from its three rows of oars, manned with one man per oar. The early trireme was a development of the penteconter, an ancient warship with a single row of 25 oars on each side (i.e., a single-banked boat), and of the bireme ( Ancient Greek: διήρης, diērēs ), a warship with two banks of oars, of Phoenician ...

  4. Japanese battleship Yamato - Wikipedia

    en.wikipedia.org/wiki/Japanese_battleship_Yamato

    Yamato (大和) was the lead ship of her class of battleships built for the Imperial Japanese Navy (IJN) shortly before World War II.She and her sister ship, Musashi, were the heaviest and most powerfully armed battleships ever constructed, displacing nearly 72,000 tonnes (71,000 long tons) at full load and armed with nine 46 cm (18.1 in) Type 94 main guns, which were the largest guns ever ...

  5. Province-class fast attack craft - Wikipedia

    en.wikipedia.org/wiki/Province-class_fast_attack...

    The first ship of the class, Dhofar was ordered in 1980, with further ships (with slightly modified armament and equipment) ordered in 1981 and 1986. The ships are 56.70 metres (186 ft 0 in) long overall and 52.00 metres (170 ft 7 in) between perpendiculars, with a beam of 8.20 metres (26 ft 11 in) and a draught of 2.40 metres (7 ft 10 in).

  6. Acero-class patrol gunboat - Wikipedia

    en.wikipedia.org/wiki/Acero-class_patrol_gunboat

    The first boat of the class, the BRP Nestor Acero (PG-901), was launched in June 2022, and became the basis for the class' name. [9] The hull number's use of "PG" indicates that the boats are classified as Patrol Gunboats based on Philippine Navy's 2016 naming classification standards. In November 2022, Rear Admiral Toribio Acaci indicated that ...

  7. Odyssey - Wikipedia

    en.wikipedia.org/wiki/Odyssey

    Synopsis Exposition (books 1–4) A mosaic depicting Odysseus, from the villa of La Olmeda, Pedrosa de la Vega, Spain, late 4th–5th centuries AD. The Odyssey begins after the end of the ten-year Trojan War (the subject of the Iliad), from which Odysseus (also known by the Latin variant Ulysses), king of Ithaca, has still not returned because he angered Poseidon, the god of the sea.

  8. Ambassador MK III missile boat - Wikipedia

    en.wikipedia.org/wiki/Ambassador_MK_III_Missile_Boat

    2 × deck-mounted 7.62 mm M60 machine guns [2] The Ambassador MK III fast missile craft or Ezzat class is a small warship built by VT Halter Marine for the Egyptian Navy. Four ships were planned at a total cost of US$1.290b; the first, S. Ezzat, was handed over in November 2013 and the remainder were scheduled to follow in 2013-14.

  9. Orbital spaceflight - Wikipedia

    en.wikipedia.org/wiki/Orbital_spaceflight

    An orbital spaceflight (or orbital flight) is a spaceflight in which a spacecraft is placed on a trajectory where it could remain in space for at least one orbit.To do this around the Earth, it must be on a free trajectory which has an altitude at perigee (altitude at closest approach) around 80 kilometers (50 mi); this is the boundary of space as defined by NASA, the US Air Force and the FAA.

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