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AAW An acronym for anti-aircraft warfare. aback (of a sail) Filled by the wind on the opposite side to the one normally used to move the vessel forward.On a square-rigged ship, any of the square sails can be braced round to be aback, the purpose of which may be to reduce speed (such as when a ship-of-the-line is keeping station with others), to heave to, or to assist moving the ship's head ...
The first deliberate uses of bar grip tyres as off-road tyres, were developed pre-war as truck tyres particularly for army use. They used crosswise tread bars for grip, arranged in a helical pattern. [4] A helical pattern was used to avoid the uneven rolling radius and vibration of a tread with simple crosswise bars and large gaps between.
Conversely, the synchropter and transverse-mounted rotor counter rotating rotorcraft (such as the Bell/Boeing V-22 tilt rotor) have two large horizontal rotor assemblies mounted side by side, and use differential collective pitch to affect the roll of the aircraft. Like tandem rotors, differential cyclic pitch is used to control movement about ...
Therefore, the instant center of rotation P of body BAC is the point where the lines through P 1-A and P 2-B cross. Since this instant center of rotation P is the center for all points on the body BAC for any random point, say point C, the speed and direction of movement may be determined: connect P to C.
Reverse grip: A reverse grip bench press utilizes an underhand (supinated) grip on the bar. A supinated grip externally rotates the humerus, which puts the shoulders in a much more favorable position for the lift, decreasing injury potential without compromising the range of motion. It emphasizes the clavicular head of the pectoralis major more ...
Rotation formalisms are focused on proper (orientation-preserving) motions of the Euclidean space with one fixed point, that a rotation refers to.Although physical motions with a fixed point are an important case (such as ones described in the center-of-mass frame, or motions of a joint), this approach creates a knowledge about all motions.
Bar Initiation: The braid bar will form following a series of dune amalgamations. As sediments are deposited to form the braid bar, flow in the channel begins to diverge, with the braid bar acting as a wedge. This stage is associated with high flow in the braided river. Bar Growth: Dune amalgamation continues as an accretionary dune front is ...
When the chin is against the chest, the neck is flexed, and the trunk is flexed when a person leans forward. [10] Flexion of the shoulder or hip is movement of the arm or leg forward. [11] Extension is the opposite of flexion, a straightening movement that increases the angle between body parts. [12] For example, when standing up, the knees are ...