Hydra may refer to:
The Hydra 70 rocket is a 2.75-inch fin-stabilized unguided rocket used primarily in the air-to-ground role. It can be equipped with a variety of warheads, and in more recent versions, guidance systems for point attacks. The Hydra is widely used by US and allied forces, competing with the Canadian CRV-7 which is physically interchangeable.
The Hydra 70 is derived from the 2.75-inch Mk 4/Mk 40 Folding-Fin Aerial Rocket developed by the United States Navy for use as a free-flight aerial rocket in the late 1940s. The Mk 40 was used during the Korean and Vietnam wars, being used to provide close air support to ground forces from about 20 different firing platforms, both fixed-wing and armed helicopters.
The main change made to produce the Hydra was the Mk. 66 motor which uses a new propellant that offers considerably more thrust, 1,335 pounds-force (5,940 N) (Mod 2/3) 1,415 pounds-force (6,290 N) (Mod 4). The fins of the Mk 40 flipped forward from the rear when the rocket left the launching tube, but in the Hydra they are curved to match the outside diameter of the rocket fuselage and flip sideways to open, which is referred to as WAFAR (Wrap-Around Fin Aerial Rocket) instead of FFAR (folding-fin aerial rocket). To improve stability during the time while the fins are still opening, the four motor nozzles have a slight cant angle to impart a spin while the rocket is still in the launch tube.
Hydra is the second studio album by American rock band Toto, released in 1979. It reached #37 on the Billboard Pop Albums. While most of the album's singles failed to make any impact in the charts, "99", a song inspired by the 1971 science fiction movie THX 1138, reached #26 on the Billboard Hot 100.
Though a commercial success, Hydra was far less popular than the band's top-selling debut. Allmusic suggested this was due to the band's failure to establish a distinctive, recognizable sound on either Hydra or their debut, which would have allowed listeners to immediately identify Toto's major hits with the band themselves. They also speculated that most listeners were not familiar with the film (namely, THX 1138) on which "99" was based, and thus found the lyrics hopelessly abstruse, preventing the song from becoming as big a hit as it could have been.
Critical response to the album was mixed. Allmusic's retrospective review made little judgment on the quality (noting only as an aside that the songs were "well-played"), instead discussing why it had failed to match the commercial success of their debut.
In geometry, a triangular prism is a three-sided prism; it is a polyhedron made of a triangular base, a translated copy, and 3 faces joining corresponding sides. A right triangular prism has rectangular sides, otherwise it is oblique. A uniform triagular prism is a right triangular prism with equilateral bases, and square sides.
Equivalently, it is a pentahedron of which two faces are parallel, while the surface normals of the other three are in the same plane (which is not necessarily parallel to the base planes). These three faces are parallelograms. All cross-sections parallel to the base faces are the same triangle.
A right triangular prism is semiregular or, more generally, a uniform polyhedron if the base faces are equilateral triangles, and the other three faces are squares. It can be seen as a truncated trigonal hosohedron, represented by Schläfli symbol t{2,3}. Alternately it can be seen as the Cartesian product of a triangle and a line segment, and represented by the product {3}x{}. The dual of a triangular prism is a triangular bipyramid.
Trip is the second album from the synthpop act Cause and Effect. It is dedicated to the memory of Sean Rowley. The album includes the song "It's Over Now," which climbed to the #7 spot on Billboard's modern rock charts. It was released in 1994 under the BMG label.
Trip is a Finnish brand of juice produced and distributed by Marli. Launched in 1962, Trip was the first beverage in Finland to be sold in a laminated carton. Originally Trip cartons were pyramid shaped, but were changed to a cuboid shape in the 1990s and were made higher and more narrow in 2002 to better fit children hands. Trip is usually drunk using the straw attached to its packaging.
World is a common name for the whole of human civilization, specifically human experience, history, or the human condition in general, worldwide, i.e. anywhere on Earth or pertaining to anywhere on Earth.
In a philosophical context it may refer to:
In a theological context, world usually refers to the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred. The "end of the world" refers to scenarios of the final end of human history, often in religious contexts.
World history is commonly understood as spanning the major geopolitical developments of about five millennia, from the first civilizations to the present.
World population is the sum of all human populations at any time; similarly, world economy is the sum of the economies of all societies (all countries), especially in the context of globalization. Terms like world championship, gross world product, world flags etc. also imply the sum or combination of all current-day sovereign states.