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Deflection (ballistics)

Deflection is a technique used for effectively propelling a projectile at a moving target, also known as leading the target , i.e. shooting ahead of a moving target so that the target and projectile will collide. This technique is only necessary when the target will have moved a sufficient distance to displace its position during the time the projectile would take to reach the target's range. This can become the case over long distances (e.g. a distant target for a skilled sniper), due to fast moving targets (e.g. an opposing aircraft in an aerial dogfight), or while using relatively slow projectiles (e.g. a crossbow bolt or a basketball thrown to a running teammate). Modern day fighter aircraft have automated deflection sights, where a computer calculates lead and projects the solution onto a head up display (HUD). The visual assistance with targeting the gun is offset by the enormous speed and agility of modern aircraft, compared to the days when targeting was less advanced...

R new calculated field by dividing sum of 1 column with count of category list [duplicate]

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up vote 0 down vote favorite This question already has an answer here: Calculate group mean (or other summary stats) and assign to original data 4 answers I have a dataframe with 2 columns: Price . Category 10 . Cat-A 5 . Cat-B 20 . Cat-A 30 . Cat-A 15 . Cat-B So, I have count = 3 for Cat-A and thus I need a new column which sums the price for Cat-A and divides by the count of category i.e., (10+20+30)/3 = 20 Final table should look like this: Price . Category . Ratio 10 . Cat-A . 20 5 . Cat-B . 10 20 . Cat-A . 20 30 . Cat-A . 20 15 . Cat-B . 10 r share | improve this question ...

Category:1987 births

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Help Category:1987 births From Wikipedia, the free encyclopedia Jump to navigation Jump to search ← 1980s births: 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 → People born in 1987 . See also: 1987 deaths. Contents Top A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Wikimedia Commons has media related to 1987 births . Pages in category "1987 births" The following 200 pages are in this category, out of approximately 15,912 total. This list may not reflect recent changes (learn more). (previous page) (next page) 0–9 1987 (artist) A A-fu Isaako Aaitui Snoh Aalegra Saara Aalto Vegard Aanestad Aarthi (actress) Ab-Soul Abdelhamid Abaaoud José Luis Abadín Dani Abalo Gonzalo Abán Anıl Abanoz Josiah Abavu Abayneh Ayele Adjheï Abbady Kyle Abbott (cricketer) Vernus Abbott Patrick Bou Abboud Noha Abd Rabo Echraf Abdallah Hamisi Abdallah Kassim Ab...

Farung Yuthithum

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Farung Yuthithum From Wikipedia, the free encyclopedia This is the current revision of this page, as edited by Ser Amantio di Nicolao (talk | contribs) at 02:14, 7 August 2018 (→‎ External links: add authority control, test using AWB ) . The present address (URL) is a permanent link to this version. Revision as of 02:14, 7 August 2018 by Ser Amantio di Nicolao (talk | contribs) (→‎ External links: add authority control, test using AWB ) (diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff) Jump to navigation Jump to search Farung Yuthithum Farung Yuthithum at Miss Universe Born Farung Yuthithum ( 1987-04-06 ) April 6, 1987 (age 31) Pathum Thani Province, Thailand Height 1.79 m (5 ft 10   1 ⁄ 2  in) Title Miss Thailand Universe 2007 Beauty pageant titleholder Hair color Black Eye color Brown Major competition(s) Miss Thailand Universe 2007 (winner), Miss...