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Revolutions per Second (r/s)

Revolutions per second (r/s) is a unit of angular velocity that measures how many complete rotations or revolutions an object makes in one second. One revolution corresponds to a full 360-degree turn or $2\pi$ radians. This unit is commonly used to describe very fast rotational speeds in machinery, motors, turbines, and other high-speed rotating systems. For example, a motor spinning at 50 r/s completes 50 full rotations every second. Revolutions per second provide a clear and precise measure of rapid rotational motion, useful in physics, engineering, and technology fields where high-speed rotation is involved. It also facilitates easy conversion to other angular velocity units like radians per second or revolutions per minute.

Mile and Square Mile – A Short Note

A mile is a unit of length used mainly in the United States and the UK. One mile equals 5,280 feet or approximately 1.609 kilometers. It is commonly used to measure long distances, such as the length of roads, travel routes, or large-scale maps.

A square mile (written as mi²) is a unit of area. It represents the area of a square that is one mile on each side. One square mile equals 640 acres or approximately 2.59 square kilometers. It is often used to measure large land areas, such as cities, regions, or forests.

In summary, a mile measures distance (one-dimensional), while a square mile measures area (two-dimensional). The distinction is important in geography, land surveying, and transportation planning.