The metric or SI (Le SystÃ¨me International d'UnitÃ©s) system of units has many derived units from the seven base units. A derived unit would be a unit that is a combination of base units. Density would be an example where density = mass/volume or kg/m3. Many derived units have special names for the properties or measurements they represent. This table lists eighteen of these specialized units along with their basic unit factors.
Cadence (cycling) In cycling, cadence (or pedalling rate) is the number of revolutions of the crank per minute; this is the rate at which a cyclist is pedalling/turning the pedals. Cadence is directly proportional to wheel speed, but is a distinct measurement and changes with gearingâwhich determines the ratio of crank rpm to wheel rpm.
Walking and biking on a stationary bike are low-impact forms of exercise. Impact refers to the amount of stress that the activity places on your body, particularly your joints. Walking at a slow-to-brisk pace is considered low-impact; race walking is considerably more stressful on your body. The same is true for cycling. Riding an exercise bike, especially a recumbent model that supports your back, is easy on your spine, knees and hips.