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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For example, aligning the rightmost 1 on the C scale with 2 on the LL2 scale, 3 on the C scale lines up with 8 on the LL3 scale. To extract a cube root using a slide rule with only C/D and A/B scales, align 1 on the B cursor with the base number on the A scale (taking care as always to distinguish between the lower and upper halves of the A scale).

  3. Fusion power - Wikipedia

    en.wikipedia.org/wiki/Fusion_power

    2 1 D + 2 1 D → 3 1 T + 1 1 H 2 1 D + 2 1 D → 3 2 He + 1 0 n. This reaction is also common in research. The optimum energy to initiate this reaction is 15 keV, only slightly higher than that for the D-T reaction. The first branch produces tritium, so that a D-D reactor is not tritium-free, even though it does not require an input of tritium ...

  4. Electric battery - Wikipedia

    en.wikipedia.org/wiki/Electric_battery

    In 2024 a prototype battery for electric cars that could charge from 10% to 80% in five minutes was demonstrated, [53] and a Chinese company claimed that car batteries it had introduced charged 10% to 80% in 10.5 minutes—the fastest batteries available—compared to Tesla's 15 minutes to half-charge.

  5. Elevator - Wikipedia

    en.wikipedia.org/wiki/Elevator

    The weight of the counterweight is typically equal to the weight of the elevator cab plus 4050% of the capacity of the elevator. The grooves in the drive sheave are specially designed to prevent the cables from slipping. "Traction" is provided to the ropes by the grip of the grooves in the sheave, thereby the name. As the ropes age and the ...

  6. Wikipedia:Reference desk/Archives/Science/October 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    1 is eating many many cattle over a long period of time. #2 is eating one cattle over a long period of time. Assuming every cow you eat has an equal chance of having bad prions in it (big, artificial assumption), it would seem that #1 would be more statistically more hazardous. --Fastfission 22:51, 23 September 2005 (UTC)

  7. List of unarmed African Americans killed by law enforcement ...

    en.wikipedia.org/wiki/List_of_unarmed_African...

    [1] December 14, 1895 Lizzie Durr: 13 Birmingham, Alabama: A police officer shot and killed Durr as she and a friend gathered coal from a train car. The officer claimed Durr jumped on him, causing his gun to discharge, but Durr's friend claimed she was shot while they were running away. Durr had been shot in the back of the head. [2] March 26, 1938

  8. Archimedes - Wikipedia

    en.wikipedia.org/wiki/Archimedes

    Archimedes gives the value of the square root of 3 as lying between ⁠ 265 / 153 ⁠ (approximately 1.7320261) and ⁠ 1351 / 780 ⁠ (approximately 1.7320512) in Measurement of a Circle. The actual value is approximately 1.7320508, making this a very accurate estimate. He introduced this result without offering any explanation of how he had ...

  9. Indiana Jones and the Last Crusade - Wikipedia

    en.wikipedia.org/wiki/Indiana_Jones_and_the_Last...

    [50] The film eventually grossed $197.1 million in the United States and Canada and $277 million internationally, for a worldwide total of $474.2 million. [1] At the time of its release, the film was the 11th highest-grossing film of all time. Despite competition from Batman, The Last Crusade became the highest-grossing film worldwide in 1989. [51]

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