Scientific Ontology

t

Base SI

Time

The progression of events; an SI base quantity.

second (s)

Dimension: $[\,T\,]$

How values of time span the physical world (in s, log scale).

Light crossing a proton

10^-24 s

One heartbeat

10⁰ s

Human lifetime

2.50 × 10⁹ s

Age of the universe

4.35 × 10¹⁷ s

Lower limit10^-24 sUpper limit10¹⁸ s

Power

P = \dfrac{W}{t}

Faraday's Law of Induction

\varepsilon = -\dfrac{d\Phi}{dt}

Frequency and Period

f = \dfrac{1}{T}

SUVAT (velocity)

v = u + at

SUVAT (displacement)

s = ut + \tfrac{1}{2}at^2

Impulse

F\Delta t = \Delta p

SHM Period (mass–spring)

T = 2\pi\sqrt{\dfrac{m}{k}}

SHM Period (simple pendulum)

T = 2\pi\sqrt{\dfrac{l}{g}}

Capacitor Discharge

Q = Q_0 e^{-t/RC}

Radioactive Decay

N = N_0 e^{-\lambda t}