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2. Shapiro time delay - Wikipedia

   en.wikipedia.org/wiki/Shapiro_time_delay

   In a 1964 article entitled Fourth Test of General Relativity, Irwin Shapiro wrote: [1] Because, according to the general theory, the speed of a light wave depends on the strength of the gravitational potential along its path, these time delays should thereby be increased by almost 2×10 −4 sec when the radar pulses pass near the sun. Such a ...

3. USRA Light Santa Fe - Wikipedia

   en.wikipedia.org/wiki/USRA_Light_Santa_Fe

   USRA Light Santa Fe. Factor of adh. The USRA Light Santa Fe was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. These locomotives were of 2-10-2 wheel arrangement in the Whyte notation, or 1′E1′ in UIC ...

4. Category:2-10-2 locomotives - Wikipedia

   en.wikipedia.org/wiki/Category:2-10-2_locomotives

   2-10-2 locomotives. Wikimedia Commons has media related to 2-10-2 locomotives. Locomotives classified 2-10-2 under the Whyte notation of locomotive axle arrangements. The equivalent UIC classification of locomotive axle arrangements is 1′E1′ locomotives.

5. 2-10-10-2 - Wikipedia

   en.wikipedia.org/wiki/2-10-10-2

   ATSF 3000 class 2-10-10-2. The forward section of the boiler is a primitive superheater and feedwater heater. In 1911 and 1912, the Atchison, Topeka and Santa Fe Railway modified ten 2-10-2 Baldwin -built locomotives into a new 2-10-10-2 configuration dubbed the 3000 class. They were the largest locomotives in the world from their introduction ...

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7. 2-10-2 - Wikipedia

   en.wikipedia.org/wiki/2-10-2

   2-10-2. Under the Whyte notation for the classification of steam locomotives, 2-10-2 represents the wheel arrangement of two leading wheels, ten powered and coupled driving wheels, and two trailing wheels. In the United States and elsewhere the 2-10-2 is known as the Santa Fe type, after the Atchison, Topeka and Santa Fe Railway that first used ...

8. Basel problem - Wikipedia

   en.wikipedia.org/wiki/Basel_problem

   The Basel problem is a problem in mathematical analysis with relevance to number theory, concerning an infinite sum of inverse squares. It was first posed by Pietro Mengoli in 1650 and solved by Leonhard Euler in 1734, [ 1 ] and read on 5 December 1735 in The Saint Petersburg Academy of Sciences. [ 2 ] Since the problem had withstood the ...

9. List of formulae involving π - Wikipedia

   en.wikipedia.org/wiki/List_of_formulae_involving_π

   mathematical constant π. 3.14159 26535 89793 23846 26433... The following is a list of significant formulae involving the mathematical constant π. Many of these formulae can be found in the article Pi, or the article Approximations of π.