On October 31, 2018 at 03:13, Ernie Gilman said...
MAH is not short for 'Miles In An Hour.' You left out an initial. You show that yourself when you write 'MPH r MIAH.'
Plus, you ignore the meaning of 'per.' It is "for each" when used to express a rate. Since speed is a rate, that meaning applies here.
21 miles in an hour means that while an hour has elapsed, you have traveled 21 miles. That is, this means that an hour has elapsed and 21 miles have been traveled.
However, a speed of 21 miles per hour does not have those implications. You can travel 21 miles per hour for ten seconds or three days, but you cannot travel 21 miles in an hour for anything more than an hour. For more time, it would be, for instance, 42 miles in two hours.
What are you on? What initial did I omit?
A speedometer shows the rate of speed at that relative period of time, based on some kind of measurement (actual measurement of distance vs time, some kind of rotating shaft driving wheels or tracks and knowing the ratio between the drive and wheels or tracks, etc and assuming there's no slippage at the contact surface). We know that. We also know that MPH means "Miles Per Hour' and that at 21 MPH, someone/something will go 21 miles in one hour, but that's only going to happen if they maintain that speed without any variation or it's the average speed for that hour.
Last edited by highfigh on November 1, 2018 07:43.
