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Distance can be fully described with a magnitude and a unit. It is a scalar quantity, which means it has a magnitude (numerical value) but not a direction. A related quantity is displacement, which is the straight line distance from a starting point to an ending point. Displacement is a vector quantity, so it can only be fully described with a magnitude, a unit, and and direction.
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What is the best metric unit used to measure the distance from Paris to Rome?
Any unit could be used. The most common for distances withterrestrial orders of magnitude is the kilometer = 1,000 meters.
Why is it necessary to use several systems to describe distance in space?
This is because the distances span several orders of magnitude. The earth-moon distance is approx 385000 kilometres, so km can be used for such measures. But the distance from the sun to Neptune is 5 approx billion km and so the earth-sun distance (1 AU) becomes a more useful unit. But that is no use for measuring distances to the stars: the nearest is approx 0.25 million AU and so a light year becomes a more appropriate distance. In terms of orders of magnitude, a parsec is only 3.26 light years but the unit comes from the method of measurement.
What is he difference between speed and velocity?
http://wiki.answers.com/Q/The_difference_of_speed_and_velocity" The difference between speed and velocity is that speed is a scalar quantity(that have only magnitude) and velocity is a vector quantity(that have both magnitude and direction).
What units for distance is an SI unit?
The S.I. unit of distance is the metres, which is basically the distance between any two points.
What are the relationships between apparent magnitude and absolute magnitude?
Apparent magnitude is the brightness of an object as seen from Earth without any atmosphere.Absolute magnitude is the brightness of an object as seen from a predetermined distance, depending on the object.For planets, the distance used is 1 AU (Astronomical Units). Stars and galaxies use 10 parsecs which is about 32.616 light years.The dimmer an object is the higher the positive value. The brighter an object is the higher the negative value.Examples:The Sun has an apparent magnitude of -26.74 but an absolute magnitude of 4.83Sirius has an apparent magnitude of -1.46 but an absolute magnitude of -1.42This means that from Earth, the Sun is a lot brighter, but if the Sun was replaced by Sirius, Sirius would be 25 times more luminous.See related links for more information
What is the SI unit for the magnitude?
A magnitude is a pure number - with no SI unit.
Do distance measurements must include magnitude unit and direction?
Not always. The direction is only necessary if you're discussinga distance vector, but you're usually not.
How is an au described?
One AU, or "Astronomical Unit", is the average distance between the Sun and the Earth.
What is the measure in distance and direction?
In physics, distance is the unit which only has magnitude and not the directions.Hence,the term used for the measurement of distance and direction together is known as displacement.Distance is a scalar quantity.Distance + direction =Displacement .It is a vector quantity.
What is magnitude unit?
A Bar
What is unit for magnitude?
A Bar
Motion is measured in terms of?
distance covered per unit time. Motion has direction and magnitude. The magnitude might also be known as speed: meters/second, kilometers/hour feet/second, miles/hour
The si unit used for magnitude?
A magnitude is a number and so has no units.
Unit used to measure the stars is called a?
magnitude for brightness, lightyear for distance, degrees C or K for temperature or colour, solar masses for mass, ...
Why unit vector has magnitude one?
That's what "unit" means.
What is the standard unit of amount?
magnitude
Can a unit vector have any components with magnitude greater than unity?
No, by definiton, a unit vector is a vector with a magnitude equal to unity.
