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Eephus pitch. This image depicts the path of an eephus pitch thrown by pitcher Rip Sewell in the 1946 MLB All-Star Game, which was hit for a home run by Ted Williams. An eephus pitch (also spelled ephus) in baseball is a very high-arcing off-speed pitch. [ 1 ] The delivery from the pitcher has very low velocity and often catches the hitter off ...
Electric arc. An electric arc between two nails. An electric arc (or arc discharge) is an electrical breakdown of a gas that produces a prolonged electrical discharge. The current through a normally nonconductive medium such as air produces a plasma, which may produce visible light. An arc discharge is initiated either by thermionic emission or ...
Tennis shot. In tennis, there are a variety of types of shots (ways of hitting the ball) which can be categorized in various ways. The serve is the opening shot of a point, and it's typically struck using an overhead throwing motion. Shots struck during the point are categorized into two major categories: groundstrokes, which are hit after the ...
A power flash is a flash of light caused by arcing electrical discharges from damaged electrical equipment, most often severed or arcing power lines. They are often caused by strong winds, especially those from tropical cyclones and tornadoes, and occasionally by intense downbursts and derechoes. Storm spotters and meteorologists use these ...
An arc flash is the light and heat produced as part of an arc fault (sometimes referred to as an electrical flashover), a type of electrical explosion or discharge that results from a connection through air to ground or another voltage phase in an electrical system. Arc flash is distinctly different from the arc blast, which is the supersonic ...
Kinematic quantities. [edit] In projectile motion, the horizontal motion and the vertical motion are independent of each other; that is, neither motion affects the other. This is the principle of compound motionestablished by Galileoin 1638,[1]and used by him to prove the parabolic form of projectile motion.
A mercury arc lamp from a fluorescence microscope. A krypton long arc lamp (top) is shown above a xenon flashtube. The two lamps, used for laser pumping, are very different in the shape of the electrodes, in particular, the cathode (on the left). An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc).
In baseball, the pitch is the act of throwing the baseball toward home plate to start a play. The term comes from the Knickerbocker Rules. Originally, the ball had to be thrown underhand, much like "pitching in horseshoes". Overhand pitching was not allowed in baseball until 1884. The biomechanics of pitching have been studied extensively.