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WikiCards · Card list · Science cards · Mach number
Rare card · Science
Mach number, a Rare card
The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.
- Rarity
- Rare
- Domain
- Science
- ATK
- 65
- DEF
- 32
- Power
- 97
- Wikipedia reads a year
- 350,000
Power 97 (ATK + DEF): stronger than 40 % of WikiCards cards.
Mach number quiz: 3 questions
Three questions on the Mach number card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
It is named after Austrian physicist and ______ Ernst Mach.
Answer
philosopher. It is named after Austrian physicist and philosopher Ernst Mach. From the Mach number article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Mach number. Mach number 65 · V1794 Cygni 61 · S. V. C. Aiya 57 · KCNIP1 53 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Mach number. Mach number 350,000 · Four Symbols 240,000 · S. V. C. Aiya 480 · 41 Sextantis 340 Wikipedia reads over a year.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- It is named after Austrian physicist and philosopher Ernst Mach.
- M = u c, where: M is the local Mach number, u is the local flow velocity with respect to the boundaries, and c is the speed of sound in the medium, which in air varies with the square root of the thermodynamic temperature.
- By definition, at Mach 1, the local flow velocity u is equal to the speed of sound.
Why it is Rare
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Mach number article was read about 350,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 65 and blocks with 32: each hit it takes is cut by 13 %.
How to get Mach number
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
More Science cards
Cards close in power
The cards just above and just below Mach number in the power ranking, all domains together.
- Wedding anniversaryEpic · History · ATK 60 DEF 37
- List of cities in Germany by populationEpic · Society · ATK 70 DEF 27
- Dhruv RatheeRare · Society · ATK 62 DEF 35
- David BallRare · Arts · ATK 58 DEF 39
- Jorge GarciaRare · Arts · ATK 63 DEF 34
- Four SymbolsRare · Science · ATK 64 DEF 33
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Mach number (revision), CC BY-SA 4.0. Photo : Realbigtaco, CC BY-SA 3.0, Wikimedia Commons.
