Fluid Streamlines

Adjust the obstacle's size and watch streamlines curve around it.

Obstacle radius

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Collision SimulatorSet two masses and velocities and watch an elastic collision play out.

Permutations & CombinationsEnter n and r to instantly calculate nPr and nCr.

Moment of InertiaCompare how a disk, ring, rod, or sphere resist rotation for the same mass and radius.

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Venn Diagram CalculatorAdjust two set sizes and their overlap to see the union and each region's count.

Monte Carlo Pi EstimatorDrop random points into a square and watch the ratio inside the circle approximate π.

Scientific Unit ConverterConvert between pressure, energy, power, data storage, and frequency units.

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