Category Archives: History of Science

Algebra, Energy, Environment, Gravity, History of Science, Mathematics, Physics, Space, Time

Fallen from Outer Space…

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A photograph of Daredevil Felix Baumgartner, as he boldly prepares to jump off his high altitude capsule for the ultimate record-breaking space dive on 14th October 2012.

Record-Breaking Space Dive

14th October 2012.  During his ultimate high-altitude parachute jump, Felix Baumgartner spends approximately 4 minutes and 22 seconds in freefall, at the maximum speed of 1,342 kilometres per hour. 

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Algebra, Geometry, History of Science, Mathematics, Physics

Constant Matters

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Pi_Number
Physical Constants (SI Units)

Avogadro Constant

N_{A} = 6.022 \times 10^{23} mol^{-1}

Bohr Radius

a_0 = 5.29 \times 10^{-11} m

Boltzmann Constant

k = 1.381 \times 10^{-23} JK^{-1}

Charge on an Electron

e = - 1.602 \times 10^{-19} C

Gravitational Constant

G = 6.673 \times 10^{-11} Nm^{2} kg^{-2}

Magnitude of Acceleration due to Gravity

g = 9.81 m s^{-2}

Permeability of Free Space 

\mu_{0} = 4 \pi \times 10^{-7} T m A^{-1}

Permittivity of Free Space 

\epsilon_{0} = 8.854 \times 10^{-12} C^{2} N^{-1} m^{-2}

Speed of Light in a vacuum

c = 2.998 \times 10^{8} m s^{-1}

 

Astronomy, Cosmology, History of Science, Space, Time

World Views

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Astronomical Beginnings

Early astronomers already make the distinction between stars and planets, as the former remain relatively fixed for centuries, while the latter wander an appreciable amount in a comparatively short time.  But that’s not all!

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