Thread View: alt.destroy.the.earth
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Started by Dave Gordon
Wed, 27 Jan 1993 20:07
Physical Constants List (repost)
Author: Dave Gordon
Date: Wed, 27 Jan 1993 20:07
Date: Wed, 27 Jan 1993 20:07
111 lines
3445 bytes
3445 bytes
As I suggested a few months ago, this group seems to be in need of some numerical values to plug into its proposed schemes. So I have started compiling a list of physical, mathematical and astronomical values and equations. These are taken from various sources, and I have converted them all to SI (using the units(1) program). If anyone has any corrections, improvements, or suggestions, please mail them to me and I will incorporate them into the next version of this list. ======================================================================== Mathematical Constants ====================== Quantity Symbol Value Units ======== ====== ===== ===== pi 3.1415927 e 2.7182818 Equations ========= Circumference of a circle of radius r C = 2*pi*r Area of a circle of radius r A = pi*r^2 Surface area of a sphere of radius r A = 4*pi*r^2 Volume of a sphere of radius r V = (4/3)*pi*r^3 Physical Constants ================== Quantity Symbol Value Units ======== ====== ===== ===== Speed of light c 2.99792458e8 m s^-1 Plancks constant h 6.626176e-34 J s Plancks constant hbar 1.054589e-34 J s Gravitational constant G 6.672e-11 N m^2 kg^-2 Charge on an electron e 1.6021892e-19 C Mass of an electron m(e) 9.109534e-31 kg Mass of a proton u 1.6605655e-27 kg Avogadro's number n(A) 6.022045e23 Boltzmann's constant k 1.380662e-23 J K^-1 Molar volume at STP Vm(STP) 2.241383e-2 m^3 Equations ========= Gravitational attration between two masses m1 and m2 separated by a distance d (Newton) F = G*m1*m2*d^-2 Mass-energy equivalence (Einstein) E = m*c^2 Astronomical Constants ====================== Quantity Symbol Value Units ======== ====== ===== ===== Mass of the Earth m(E) 6e24 kg Mass of the Moon m(L) 7e22 kg Mass of the Sun m(S) 2e30 kg Radius of the Sun r(S) 7e8 m Temperature of the Sun (surface) 6e3 K Temperature of the Sun (core) 1.4e7 K Total solar radiation 4e26 W (J s^-1) Distance Earth-Sun au 1.495979e+11 m Light-year ly 9.460530e+15 m Equations ========= Radius of a (spherical, non-rotating) black hole of mass m (Schwartzchild) r = 2*G*m*c^-2 ======================================================================== So, as an example, I can use these figures to calculate the incident solar radiation at a distance of 1au: Total solar radiation ------------------------------------ Surface area of sphere of radius 1au 4e26/(4*pi*1.495979e+11^2) = ~1400 W m^-2 Thus a mirror in Earth orbit could collect well over *1GW* per square kilometre, even after allowing for losses. That's a lot of power - surely someone can find an application for it (diverting asteroids springs to mind)! -- =============================================================================== Dave | dsg@imp.co.uk | +44 753 516599 | I am not a .sig virus, I am a free bug! ===============================================================================
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