Snell's law of refraction ( wavelengths)
Sound Intensity Level
Self-inductance
Magnetic field created by a current ( magnetomotive force.F=N*I)
Euler's line Equation (any triangle)
Geometric series (sum of the numbers)
Elastic deflection to an end loaded cantilever beam
Present value of a growing annuity
Space Diagonal - Rectangular cuboid
Orbital Period - Ellipse