Either by miles since last change, by calendar time since last change or by looking at its colour.
u can change revs of ur motorcycle. lets say ur motorcycle goes up tp 12,000 rpm. u8 can put a limiter on the engine so u will be shifting at the right time.
Polychromic cultures determine when it is time to change from one activity to the next based on how they feel. Monochromic cultures determine when it is time to change activities based on clock time.
be on time
I'm assuming that you are referring to WHEN the chords should be changed in a piece of music. If you are, than I will tell you that the notes of the melody determine when the chord must change.
You need to know your change of position vs. change of time.
Motorcycle School? Do you mean a motorcycle mechanic? Depends if you go to school full time or part time.
Change in velocity over the change in time
The average acceleration during any interval is (change in speed) divided by (time for the change).A = (25 - 10)/5 = 15/5 = 3 meters per second2
To determine the acceleration of an object, you must calculate its change in velocity per unit of time.
"time"
There is no 'right' time -- the choice is arbitrary.
The Year Prior to the Invention of the MotorCycle