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  2. Hubble's law - Wikipedia

    en.wikipedia.org/wiki/Hubble's_law

    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 constant can also be stated as a relative rate of expansion.

  3. Wilford Gyroplane - Wikipedia

    en.wikipedia.org/wiki/Wilford_Gyroplane

    Its rotor had a diameter of 25 ft (7.6 m), though the broad blades began about 1 ft 3 in (0.38 m) from their common vertical mast. Each blade had an area of about 15 sq ft (1.4 m 2) and an aspect ratio of 8.4. [1] Opposing pairs of blades were rigidly fixed together but free to rotate on their common axis.

  4. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    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.

  5. Lotus Europa - Wikipedia

    en.wikipedia.org/wiki/Lotus_Europa

    For Lotus's use, the Renault engine was given a number of key improvements, including a higher compression ratio (10.25 instead of 8.6), larger inlet valves, revised valve timings, dual valve springs and a twin-barrel carburettor. These changes lifted the engine's power by 23% from 63 hp (47 kW) at 5,000 rpm to 82 hp (61 kW) at 6,000 rpm.

  6. Economy of Pakistan - Wikipedia

    en.wikipedia.org/wiki/Economy_of_Pakistan

    The public debt/revenues ratio surged to 624%, and the interest payments/revenues ratio reached 42.6%, rendering Pakistan's public debt unsustainable. Concerns over external debt default emerged in 1996 and 1998, triggered by Western economic sanctions in response to Pakistan's nuclear tests in May 1998, causing massive capital flight.

  7. Demographics of Rwanda - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_Rwanda

    21.8 32.3 8.12 141.6 44.43 1957 2 706 000 145 000 57 000 88 000 53.6 21.1 32.5 8.14 138.1 45.16 1958 2 793 000 148 000 57 000 91 000 53.0 20.5 32.6 8.16 134.5 45.86 1959 2 881 000 151 000 57 000 94 000 52.4 19.8 32.6 8.18 131.1 46.62 1960 2 966 000 154 000 57 000 97 000 51.7 19.2 32.5 8.19 128.1

  8. Antarctic minke whale - Wikipedia

    en.wikipedia.org/wiki/Antarctic_Minke_Whale

    The heaviest caught in the Antarctic were a 9 metres (29.5 feet) female that weighed 10.4 metric tons (11.5 short tons) [25] and an 8.4 metres (27.6 feet) male that weighed 8.8 metric tons (9.7 short tons). [26] At physical maturity, females average 8.9 metres (29.2 feet) and males 8.6 metres (28.2 feet).

  9. Pythagoras - Wikipedia

    en.wikipedia.org/wiki/Pythagoras

    [5] [6] [7] The earliest sources on Pythagoras's life are brief, ambiguous, and often satirical. [4] [8] [9] The earliest source on Pythagoras's teachings is a satirical poem probably written after his death by the Greek philosopher Xenophanes of Colophon (c. 570 – c. 478 BC), who had been one of his contemporaries.