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The Hubble constant is most frequently quoted in km/s/Mpc, which gives the speed of a galaxy 1 megaparsec (3.09 × 10 19 km) away as 70 km/s. Simplifying the units of the generalized form reveals that H 0 specifies a frequency (SI unit: s −1), leading the reciprocal of H 0 to be known as the Hubble time (14.4 billion years). The Hubble ...
The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.
For this reason, copper is usually supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms. [15] The softness of copper partly explains its high electrical conductivity (59.6 × 10 6 S/m) and high thermal conductivity, second highest (second only to silver) among pure metals at room temperature. [16]
In 1963, at age 21, Hawking was diagnosed with an early-onset slow-progressing form of motor neurone disease that gradually, over decades, paralysed him. [ 20 ] [ 21 ] After the loss of his speech, he communicated through a speech-generating device , initially through use of a handheld switch, and eventually by using a single cheek muscle.
The longest baleen plates average 25 to 27 cm (9.8 to 10.6 in) in length and about 12.5 to 13.5 cm (4.9 to 5.3 in) in breadth and number 155 to 415 pairs (average 273). They are two-toned, with a dark gray outer margin on the posterior plates and a white outer margin on the anterior plates – though there may be some rows of dark plates ...
This shouldn't be confused with a simplified version known today as "Pythagorean numerology", involving a variant of an isopsephic technique known – among other names – as pythmenes ' roots ' [125] or ' base numbers ', [126] by means of which the base values of letters in a word were mathematically reduced by addition or division, in order ...
Between 2009 and 2017 the Greek government debt rose from €300 bn to €318 bn, i.e. by only about 6% (thanks, in part, to the 2012 debt restructuring); [34] [119] however, during the same period, the critical debt-to-GDP ratio shot up from 127% to 179% [34] basically due to the severe GDP drop during the handling of the crisis.
Subsequent to this first pair, mature nodes form compound leaves with three blades. Mature trifoliolate leaves, having three to four leaflets per leaf, are often between 6 and 15 cm (2 + 1 ⁄ 2 and 6 in) long and 2 and 7 cm (1 and 3 in) broad. Under ideal conditions, stem growth continues, producing new nodes every four days.