# Definitions for rotational speedro·ta·tion·al speed

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1. rotational speed

Rotational frequency (also known as rotational speed or rate of rotation) of an object rotating around an axis is the frequency of rotation of the object. Its unit is revolution per minute (rpm), cycle per second (cps), etc.The symbol for rotational frequency is ν {\displaystyle \nu } (the Greek lowercase letter nu). Tangential speed v, rotational frequency ν {\displaystyle \nu } , and radial distance r, are related by the following equation:

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1. Rotational speed

Rotational speed is the number of complete rotations or revolutions per time unit. Rotational speed is a cyclic frequency measured in hertz in the SI System or revolutions per minute or per second, the latter of which is more common in everyday life. Scientists, however, generally prefer to measure rotational speed in radians per second. The symbol for rotational speed is ω. When proper units are used for tangential speed v, rotational speed ω, and radial distance r, the direct proportion of v to both r and ω becomes the exact equation: An algebraic rearrangement of this equation allows us to solve for rotational speed: Thus, the tangential speed will be directly proportional to r when all parts of a system simultaneously have the same ω, as for a wheel, disk, or rigid wand. It is important to note that the direct proportionality of v to r is not valid for the planets, because the planets have different rotational speeds. Rotational speed can measure, for example, how fast a motor is running. Rotational speed and angular speed are sometimes used as synonyms, but typically they are measured with a different unit. Angular speed, however, tells the change in angle per time unit, which is measured in radians per second in the SI system. Since there are 2π radians per cycle, or 360 degrees per cycle, we can convert angular speed to rotational speed by:

### Numerology

1. Chaldean Numerology

The numerical value of rotational speed in Chaldean Numerology is: 6

2. Pythagorean Numerology

The numerical value of rotational speed in Pythagorean Numerology is: 3

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"rotational speed." Definitions.net. STANDS4 LLC, 2023. Web. 30 May 2023. <https://www.definitions.net/definition/rotational+speed>.

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##### repetition of the ends of two or more successive sentences, verses, etc.
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