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Worksheet 980

PPI can be calculated from knowing the diagonal size of the screen in inches and the resolution in pixels (width and height). This can be done in two steps

Using the Pythagorean theorem, for 3 different screen resolutions:

Diagonal Resolution - Pixels

Using the Diagonal Resolution from the previous formula we calculate the PPI for 3 corresponding screen sizes :

Pixels Per Inch (PPI)


10.1 inch tablet screen of resolution 1024×600 : 117.5PPI
21.5 inch PC monitor of 1080p resolution : 102.46PPI
27 inch PC monitor of 1440p resolution : 108.78PPI

Black-Scholes formula - value of a call option for a non-dividend-paying underlying stock

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Solar cell - current delivered by the illuminated diode

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Radiation Pressure by Reflection (using particle model: photons)

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Magnetic field created by a current ( magnetomotive force.F=N*I)

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Menzerath's Law

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Gain of pyramidal horn antenna

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Load and Resistance Factor Design (LRFD) - Load combinations (eq5)

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Nut Factor

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Borda–Carnot equation (Sudden contraction of a pipe)

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