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SpaceX CRS-7, also known as SpX-7, [1] was a private American Commercial Resupply Service mission to the International Space Station, contracted to NASA, which launched and failed on June 28, 2015. It disintegrated 139 seconds into the flight after launch from Cape Canaveral , just before the first stage was to separate from the second stage. [ 2 ]
While a system of 3 bodies interacting gravitationally is chaotic, a system of 3 bodies interacting elastically is not. [clarification needed] There is no general closed-form solution to the three-body problem. [1] In other words, it does not have a general solution that can be expressed in terms of a finite number of standard mathematical ...
Orbital-3, [6] [7] also known as Orb-3, was an attempted flight of Cygnus, an automated cargo spacecraft developed by United States–based company Orbital Sciences, on 28 October 2014. The mission was intended to launch at 22:22:38 UTC that evening.
Static force fields are fields, such as a simple electric, magnetic or gravitational fields, that exist without excitations.The most common approximation method that physicists use for scattering calculations can be interpreted as static forces arising from the interactions between two bodies mediated by virtual particles, particles that exist for only a short time determined by the ...
The Feynman Lectures on Physics is a physics textbook based on a great number of lectures by Richard Feynman, a Nobel laureate who has sometimes been called "The Great Explainer". [1] The lectures were presented before undergraduate students at the California Institute of Technology (Caltech), during 1961–1964.
In the International System of Units (SI), the unit of time is the second (symbol: s). It has been defined since 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom", and is an SI base unit. [12]
The ratios predicted (by mass, not by abundance) are about 0.25 for 4 He:H, about 10 −3 for 2 H:H, about 10 −4 for 3 He:H, and about 10 −9 for 7 Li:H. [35] The measured abundances all agree at least roughly with those predicted from a single value of the baryon-to-photon ratio.
This chapter deals with elections for President every four years, and vacancies. Chapter 1: Presidential Elections and Vacancies § 1. Time of appointing electors § 2. Repealed § 3. Number of electors § 4. Vacancies in electoral college § 5. Certificate of ascertainment of appointment of electors § 6. Duties of Archivist § 7. Meeting and ...