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FutureStarrHow Do I Calculate Miles Per Hour
Do you want to calculate your automotive mileage but don't know how? You may find the answer here.
Automobiles and trains measure speed in kilometers per hour (kph) or in miles per hour (mph), and on airplanes and ships we usually use knots (kn). On the other hand, physicists most often use the SI base units which are meters per second (m/s). The speed definition hides behind these units, and we can get familiar with it by examining them. Everything about speed is related to distance and time. The units of speed are specified by traveled distance units divided by units of time, and that is the general idea of speed. In a more simple way - speed is the distance traveled per unit of time.
Sound moves through the air at a speed of around 343 meters per second, which is 1234.8 km/h or 767 mph (at 20 °C / 68 °F). It means that a sound wave in air needs about 2.9 seconds to travel one kilometer, or 4.7 seconds to travel a mile - this data might be useful for storm-hunters to determine the lighting distance. In 2012, Austrian Felix Baumgartner broke the sound barrier (with his body!) during a free-fall from 228 000 feet. He reached the speed of 833.9 mph. To put it into context, the typical passenger of jet aircraft cruises at an attitude of 33 000 - 35 000 feet, at a speed of around 500 mph (depending on the aircraft type as well as on the wind speed). (Source: www.omnicalculator.com)
There are two types of acceleration, average and instantaneous. Average acceleration is the change in speed divided by the change of time, and is the how an object's movement changes with time, on average. Instantaneous acceleration is the derivative of speed with respect to time, or the limit of the average acceleration over an infinitesimal period of time. It is used to find the exact acceleration of an object at a particular time.
Rate is a very important type of ratio, used in many everyday problems, such as grocery shopping, traveling, medicine--in fact, almost every activity involves some type of rate. Miles per hour or feet per second are both rates of speed. Number of heartbeats per minute is called "heart rate." If you ask a babysitter, "What is your rate?", you are asking how many dollars per hour you will be charged. The little word "per" is always a clue that you are dealing with a rate. Unit price is a particular rate that compares a price to some unit of measure. For example, suppose eggs are on sale for $.72 per dozen. The unit price is $.72 divided by 12, or 6 cents per egg. (Source: www.math.com)