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rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in anydirection
Circumference of wheel = 2*pi*1 = 2*pi 50/2*pi = 7.957747155 nearly 8 meters
A tape measure is used in tailoring. A meter with a wheel is used to measure cloth coming off a loom.
-- ruler -- tape measure -- surveyor's walking wheel -- meter stick -- surveyor's chain -- odometer -- laser rangefinder -- radar -- sonar
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density