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This lesson presents timekeeping devices and the types and units of time measurement.
This lesson helps to understand the Doppler effect.
Find out whether the marble reaches the finish line faster on the straight or on the curved slope.
It is a well-known phenomenon that the sound of an approaching sound source is higher...
In this experiment we produce carbon dioxide with vinegar and baking powder.
In this experiment we prove that it is possible to cut a bottle with just a string.
Submarines submerge and surface by changing the average density of the hull.
The three important laws describing planetary motion were formulated by Johannes Kepler.