Articles
Notes and explanations from Corey Mousseau.
A PET scanner does not photograph a positron. It detects candidate pairs of approximately 511-keV photons, uses accepted coincidences to define lines of response, and reconstructs many corrected measurements into an estimate of radiotracer activity.
A modern USB-C charger does not simply dump its maximum wattage into whatever you connect. The charger, cable, and device establish a power contract first, and P = VI explains what each accepted voltage-current combination means.
An EV can use the same electric machine to speed up and slow down. The key is not reversing the wheels. It is reversing the direction of energy flow and electromagnetic torque.
Formula 1's movable front and rear wings give the car one aerodynamic setup for corners and another for straights. The reason is a physics tradeoff: downforce helps the tires turn the car, but the same airflow also creates drag.
The knocking inside an MRI scanner starts with electric current, magnetic force, and vibration. Follow that chain and the noise stops being mysterious.
On August 12, a NASA research jet will fly along the path of a total solar eclipse. The reason comes down to moving shadows, relative velocity, and a few extra seconds of access to the Sun's corona.
The graph-reading habit that saves students from mixing up position, velocity, and acceleration.
A clean explanation of pressure, area, force, and why the distinction matters in fluids problems.
A practical explanation of charge flow, voltage drop, and energy transfer in a steady circuit.
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