what are the differences between the speedometer of car , motorbikes and buses .
Answers
Answer:
If a car and a bus were moving at x speed as per their respective speedometer, will there be any difference due to size of their tires?
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No there will not be any speed deviations unless the size of tire they(car&bus) having are of standard size i.e., as per manufacturer's specifications. If not then there will be lil bit of deviation. Otherwise they are calibrated.
If the Wheel having larger wheel diameter then naturally it's perimeter is larger and hence the distance traveled by larger tire per revolution is much more.
Assume Bus having tire size 20 inches and car having 10 inches diameter.
Now, distance traveled by Bus/revolution= 2piR= 2*3.14*10= 62.8 inches. = 1.595 meters.
Therefore, number of Rotations required to travel 1km distance by bus = 626.95 revolutions.
If bus(it's wheel more specifically) is traveling at 626.95 RPM then the Bus's velocity shown by speedometer will be 1km/hour.
And for 100 km per hour bus need to travel at 62695 RPM wheel speed.
This is calibrated very scrupulously. It is shown either by Gear arrangements or by RPM sensor (used by most of the modern vehicles)
On other hand,
distance traveled by Car = 2*3.14*5= 31.4 inches. = 0.7975 meters.Number of Rotations required to complete 1KM.= 1253 rotations( here is is clear that small tire size require rotate it's wheel in order have high speed.
But it doesn't mean that car is showing different reading on its speedometer.