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  2. Cosecant squared antenna - Wikipedia

    en.wikipedia.org/wiki/Cosecant_squared_antenna

    An object at height h above the ground and slant range R forms an angle α that can be calculated through sin α = h / R.By re-arrangement, R = h / sin α, or R = h csc α. The radar equation states that the signal received from an object, P e, varies inversely with the 4th power of range and directly as the square of the antenna gain, G, such that P e ~ G 2 / R 4.

  3. Physical Science Study Committee - Wikipedia

    en.wikipedia.org/wiki/Physical_Science_Study...

    By the 1964–1965 school year, about half the US students enrolled in high school physics (200,000 students, 5000 teachers) were reportedly using the PSSC course materials. [6] However, considerable resistance developed among some teachers to the disruption of traditional methods of teaching.

  4. Csc-1 - Wikipedia

    en.wikipedia.org/wiki/Csc-1

    Csc-1, CSC-1, csc-1, or csc −1 may refer to: csc x −1 = csc( x )−1 = excsc( x ) or excosecant of x , an old trigonometric function csc −1 y = csc −1 ( y ), sometimes interpreted as arccsc( y ) or arccosecant of y , the compositional inverse of the trigonometric function cosecant (see below for ambiguity)

  5. CRC Handbook of Chemistry and Physics - Wikipedia

    en.wikipedia.org/wiki/CRC_Handbook_of_Chemistry...

    The CRC Handbook of Chemistry and Physics is a comprehensive one-volume reference resource for science research. First published in 1914, it is currently (as of 2024 [update] ) in its 105th edition, published in 2024.

  6. List of mathematical abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical...

    pdf – probability density function. pf – proof. PGL – projective general linear group. Pin – pin group. pmf – probability mass function. Pn – previous number. Pr – probability of an event. (See Probability theory. Also written as P or.) probit – probit function. PRNG – pseudorandom number generator.

  7. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    List of letters used in mathematics and science; Glossary of mathematical symbols; List of mathematical uses of Latin letters; Greek letters used in mathematics, science, and engineering; Physical constant; Physical quantity; International System of Units; ISO 31

  8. What Is a Credit Card Security Code and Why Is It Important?

    www.aol.com/credit-card-security-code-why...

    Sometimes users intentionally make purchases and file chargeback claims with the credit card company afterward to try and get something for free. This is called “cyber shoplifting,” and in ...

  9. Lists of physics equations - Wikipedia

    en.wikipedia.org/wiki/Lists_of_physics_equations

    In physics, there are equations in every field to relate physical quantities to each other and perform calculations. Entire handbooks of equations can only summarize most of the full subject, else are highly specialized within a certain field. Physics is derived of formulae only.