Alpha is often used in physics and chemistry as a symbol or in the names of things, for example alpha particles (which are two protons and two neutrons bound together into a particle the same as a helium nucleus). The symbol is also used a lot in mathematics in algebra, for example naming angles.
Recurve bow. A recurve bow is a bow with limbs that curve away from the archer when unstrung. A recurve bow stores more energy and delivers energy more efficiently than the equivalent straight-limbed bow, giving a greater amount of energy and speed to the arrow.
(The recurve bow is a double kick bow.) Since the arrow is a slender and long rod, it would buckle if it is pushed beyond the buckling limit. The dynamic buckling limit load is somewhat larger than the static limit; however, for simplicity, the maximum push force is compared with the static buckling load Ï 2 EI L / 2.