type of friction that opposes the motion of an object traveling either through liquid or gas is known as <u>drag</u><u>.</u>
The Ancient Egyptians used simple sundials and divided days into smaller parts, and it has been suggested that as early as 1,500BC, they divided the interval between sunrise and sunset into 12 parts. ... Known as a clepsydra, it uses a flow of water to measure time.
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