Number 75

A page of the Numeropedia - the Special Encyclopedia of Numbers

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[Trivia]  The 75th wedding anniversary is traditionally/modernly named diamond anniversary.


[Calendar]  The number of non-leap years in the 20th century, following the adoption of the current Gregorian calendar, created by Pope Gregory XIII in 1582 to reform the old Julian calendar.

 

[Chemistry]  The atomic number of Rhenium (Re).

 

[Chemistry]  The composition of U.S. nickel is always of 25% nickel 75% copper, except the war-issued coins have no nickel: 56% copper, 35% silver and 9% manganese.

 

[EECS]  75(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%). 75pF (picofarads) is one of standard numerical values for capacitors.

 

[Geology]  I-75, a major U.S. North-South interstate highway, connecting Sault Ste. Marie, Michigan to Miami, Florida, 1787 miles.

 

[Game]  In the popular TV game show “Deal or No Deal”, a contestant has the choices of one of 26 suitcases of the prizes U.S. $0.01, 1, 5, 10, 25, 50, 75, 100, 200, 300, 400, 500, 750, 1000, 5000, 10,000, 25,000, 50,000, 75,000, 100,000, 200,000, 300,000, 400,000, 500,000, 750,000 and the maximum amount is at least $1,000,000 (in a typical show).

 

[History]  The number of days the King Edward V reined the Great Britain in 1483.

 

[Math.]  A number is divisible by 25 when it ends with 2 digits 00, 25, 50 or 75.

 

[Math.]  Its odd powers end with 75. Its even powers end with 25.

 

[Math.]  The 6th Keith number: 7, 5, 12, 17, 29, 46, 75, 121… 

 

[Sport]  The largest book ever published is GOAT, Greatest of All Time, a book tribute to former heavyweight champion Muhammad Ali: 75 pounds, 792 pages that are 20 in×20 in.

 

[Tech.]  One of standardized baud rate (bits per second) in electronic data transmissions.

 

[Tech.]  The standard thickness of a smart card (or chip card) is 0.75 mm.

 

[Tech.]  The powers of commercial incandescent light bulbs: 300W, 100W, 75W, 60W, 40W, 30W, 15W, 7.5W and 3W.

 

[Tech.]  The numbers of automobile gear oil SAE viscosity: 75W, 80W, 80W-90, 85W, 90W and 140W.

 

[Tech.]  Automobile tires used in the U.S. have aspect ratio (section height/section width) is 60, 70, 75 or 80 (%).

 

[Tech.]  Automobile Tire’s Speed Rating

Tire Rating

L

M

N

P

Q

R

S

Max. Speed (mph)

Max. Speed (kph)

75

120

81

130

87

140

93

150

100

160

106

170

112

180

Tire Rating

T

U

H

V

W

Y

 

Max. Speed (mph)

Max. Speed (kph)

118

190

124

200

130

210

149

240

168

270

186

300

 

 

[Trivia]  U.S. freeway speed limits for automobiles are 55, 65, 70 or 75 miles/hour. The typical limit is 65 miles/hour in most states.