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Float serves are only possible with minimal to no spin of the volleyball while it is moving in the air. [1] Unlike a topspin serve, which uses the spin of the ball to create a constant difference in pressure that drives the ball downward at a high speed, the float serve can be affected in any direction by the random forces of the air and pressure (drag, lift, drag crisis, turbulence) because ...
Servo and receiver connections A diagram showing typical PWM timing for a servomotor. Servo control is a method of controlling many types of RC/hobbyist servos by sending the servo a PWM (pulse-width modulation) signal, a series of repeating pulses of variable width where either the width of the pulse (most common modern hobby servos) or the duty cycle of a pulse train (less common today ...
A diagram of the commutation structure of the Poincaré algebra. The edges of the diagram connect generators with nonzero commutators. The bottom commutation relation is the ("homogeneous") Lorentz group, consisting of rotations, =, and boosts, =. In this notation, the entire Poincaré algebra is expressible in noncovariant (but more practical ...
A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage.. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. [2]
The group I is isomorphic to A 5, the alternating group on 5 letters, since its elements correspond 1-to-1 with even permutations of the five T symmetries (or the five tetrahedra just mentioned). Representing rotations with quaternions, I is made up of the 120 unit icosians. As before, this is a 1-to-2 correspondence. I h, (*532) [5,3] 5 3 2/m ...
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A pitch thrown entirely without spin is less desirable, however, than one with a very slight spin. If the ball completes between one-quarter and one-half a rotation on its way from the pitcher to the batter; the position of the stitches changes as the ball travels, affecting the drag that gives the ball its motion, thus making its flight erratic.
The three standard volleyball formations are known as "4–2", "6–2" and "5–1", which refers to the number of hitters and setters respectively. 4–2 is a basic formation used only in beginners' play, while 5–1 is by far the most common formation in high-level play.