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Voltage, current, or power. You need two out of the three.
A magnitude, and a direction. Or, components in two directions, often called "x-component" and "y-component".
Physical Quantities are of TWO types: 1) Fundamental Quantities. 2) Derived Quantities.
The two physical quantities of measurement are: 1. Scalars - quantities with magnitude (size) only examples: distance - 1 km mass - 5kg speed - 80km/h 2. Vectores - quantities having both magnitude and direction examples: displacement - 1km, to the right weight - 50 newtons velocity - 80km/h, west
Aircraft measure two kinds of speed, air speed and speed over ground. Air speed is measured by the flow of air one way or another. Speed over ground can nowadays easily be measured by GPS. Or the Old fashioned way of checking the time it takes to pass from one land mark to another.
meter per second
You need:* Distance Travelled * Time taken to travel that distance Speed = Distance / Time
The ratio between two quantities, usually quantities that somehow measure power, or intensity (power / area).
The ratio between two different quantities is the rate.Usually, the second unit is a measure of time.
mass and volume
It is so that two people can agree on the quantities that they are talking about.
mass and volume
an unknown quantity represented by a letter
A mathematical formula, such as Speed = Distance / Time for example.
Voltage, current, or power. You need two out of the three.
Grams to measure weight. To measure the speed and mileage at the same time. These two do not mix.
The distance and time.