Wednesday, September 5, 2012

Significant Physics Constants

  • Sources
  • $\epsilon_0 \approx 8.854187817620...  10^{-12} $
    • Source = Wikipedia
    • $\mbox{Used in Coulomb's Law defining the electrostatic force}$
      • $F_c = \left(\dfrac{1}{4 \pi \epsilon_0}\right) \left(\dfrac{q_1 q_2}{r^2}\right)$
    • $\epsilon_0  \mbox{is defined by:}$
      • $\epsilon_0 = \dfrac{1}{\mu_0 c^2} $
  • $\mu_0 = 4 \pi 10^{-7} \approx  1.2566370614...  10^{-6}$
  • $\mbox{Gravitational constant} \; G = 6.67384  10^{-11} $
    • Source = Wikipedia
    • According to the law of universal gravitation, the attractive force (F) between two bodies is proportional to the product of their masses (m1 and m2), and inversely proportional to the square of the distance, r, (inverse-square law) between them:
      • $F_g = G  \dfrac{m_1  m_2}{r^2} $