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  2. Basic State Exam (Russia) - Wikipedia

    en.wikipedia.org/wiki/Basic_State_Exam_(Russia)

    Answer Sheet No. 1: Used for recording short-answer responses. Students fill in designated fields corresponding to specific tasks. Different versions exist depending on the subject, such as mathematics, Russian language, social studies, biology, history, literature, and chemistry. Answer Sheet No. 2: Designed for detailed, extended responses ...

  3. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are experimental, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail.

  4. Gravitational biology - Wikipedia

    en.wikipedia.org/wiki/Gravitational_biology

    Gravitational biology is the study of the effects gravity has on living organisms. Throughout the history of the Earth life has evolved to survive changing conditions, such as changes in the climate and habitat. However, one constant factor in evolution since life first began on Earth is the force of gravity.

  5. Two-body problem in general relativity - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem_in...

    The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. Kepler published the first two laws in 1609 and the third law in 1619. They supplanted earlier models of the Solar System, such as those of Ptolemy and Copernicus. Kepler's laws apply only in the limited case of the two-body ...

  6. Basic State Exam - Wikipedia

    en.wikipedia.org/wiki/Basic_State_Exam

    Answer Sheet No. 1: Used for recording short-answer responses. Students fill in designated fields corresponding to specific tasks. Different versions exist depending on the subject, such as mathematics, Russian language, social studies, biology, history, literature, and chemistry. Answer Sheet No. 2: Designed for detailed, extended responses ...

  7. Period-doubling bifurcation - Wikipedia

    en.wikipedia.org/wiki/Period-doubling_bifurcation

    A period-doubling cascade is an infinite sequence of period-doubling bifurcations. Such cascades are one route by which dynamical systems can develop chaos. [1] In hydrodynamics, they are one of the possible routes to turbulence. [2] Period-halving bifurcations (L) leading to order, followed by period-doubling bifurcations (R) leading to chaos.

  8. Period 2 element - Wikipedia

    en.wikipedia.org/wiki/Period_2_element

    A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases; a new row is started when chemical behavior begins to repeat, creating columns of elements with similar properties.

  9. 100,000-year problem - Wikipedia

    en.wikipedia.org/wiki/100,000-year_problem

    δ 18 O, a proxy for temperature, for the last 600,000 years (an average from several deep sea sediment carbonate samples) [a]. The 100,000-year problem (also 100 ky problem or 100 ka problem) of the Milankovitch theory of orbital forcing refers to a discrepancy between the reconstructed geologic temperature record and the reconstructed amount of incoming solar radiation, or insolation over ...