Practical physics and experiments
Find the mass moment of inertia of a solid cylinder, cylindrical tube or thin shell, then race all three down an inclined…
Build a DIY smartphone projector from a magnifying glass and a shoebox. Using the thin lens equation, this calculator finds…
Build a simple launcher and explore parabolic projectile motion. Enter the measured time of flight, horizontal distance and…
Calculate the divergence of a laser beam from two beam diameters measured a known distance apart using θ = 2·arctan[(Df −…
Calculate the focused spot size of a laser beam from the wavelength, lens focal length, input beam diameter and M² beam quality…
Measure the width of a single hair using a laser pointer and its diffraction pattern. Enter the laser wavelength, the distance…
Calculate the immersed (apparent) weight of any object submerged in a liquid using Archimedes' principle. Enter the object…
Calculate your reaction time with the simple ruler drop experiment. Enter one or more catch distances to find your average…
Prove the Earth is round with three simple experiments: see a sunset twice, hide objects behind the horizon, and measure…
Find the sunrise and sunset times for any location and date, plus solar noon and the total length of daylight. Uses the NOAA…
Find the Sun's position in the sky for any location, date and time. Calculate the solar elevation and azimuth angles using…
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