David Grayless#RotationalFrequency, also known as rotational speed or rate of rotation (symbols ν, lowercase Greek nu, and also n), is the frequency of rotation of an object #aroundAnAxis. Its #SIUnit is the #reciprocalSeconds (s−1); other common #unitsOfMeasurement include the #hertz (Hz), #cyclesPerSecond (cps), and #revolutionsPerMinute (rpm). Rotational frequency can be obtained dividing #angularFrequency, ω, by a full #turn (2π #radians): ν=ω/(2π rad).
FlohEinsteinHere in #Iceland, signs along the road show you the wind speeds on the mountain pass ahead. Like on the weather report, these values are in meters per second.
In Switzerland, weather reports are in kilometers per hour.
Both places indicate speed limits in kilometers per hour.
Why can't we use #SIunit s everywhere? km/h is good if I want to estimate my travel time, but for safe driving I find m/s helps me judge the risk more accurately.
V max 5 m/s is 18 km/h, 25 is 90, 30 is 108...
#travel
Mazzo
