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What is magnitude?by nehach
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#1
Jun1108, 12:42 AM

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Actually i have just been to class 11th so i m not clear about magnitude so please help me in knowing magnitude and magnitude of displacement...



#2
Jun1108, 03:16 AM

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Basically, magnitude just means how big it is.
If you have a vector (in, say, three dimensions) [tex]\vec x = (x_1, x_2, x_3)[/tex] then the magnitude of that vector is given by (Pythagoras): [tex]\vec x = \sqrt{x_1^2 + x_2^2 + x_3^2}[/tex]. 


#3
Jun1108, 03:56 AM

P: 6

still not very clear how it is related to distance and displacement........then wt is magnitude of displacement.



#4
Jun1108, 04:14 AM

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What is magnitude?
"magnitude" is a long word which means something very simple. As CompuChip says, it just means how big something is. For example, if something is displaced along the xaxis by 3, then the magnitude of its displacement is also 3. But if something is displaced along the xaxis by 3, then the magnitude of its displacement is still 3. (magnitude is always positive, or zero.) 


#5
Jun1108, 04:15 AM

P: 35

Distance is a scaler quantity defined as the path length, i.e., it does depend on the actual path taken. Distance only equals the magnitude of the displacement for straight line paths. Hope this hepls 


#6
Jun1108, 04:39 AM

P: 6

if a person start from i and reach to f
distance between i and f is 5 km i 5KMf now kindly tell me what is magnitude and what is displacement kindly tell me the formula how to calculate both of them because i am confisued in this 


#7
Jun1108, 04:49 AM

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Hi nehach!
Displacement: 5 km East. Magnitude: 5 km. 


#8
Jun1108, 04:55 AM

P: 6

thanks tinytim now its clear to me



#9
Jun1108, 04:57 AM

P: 6

hey could u plz give me ur gmail id so that instead of wasting our time
we can discuss any problem directly if u think ok kindly give me ur gmail id and kindly tell me the formula of calulating both displacement and magnitude 


#10
Jun1108, 02:19 PM

P: 11

Displacement is a vector quantity. It has direction and magnitude. The absolute quantity of vector is its magnitude.
You can use the formula posted by CompuChip to calculate it Sorry if I said something wrong 


#11
Jun1108, 06:00 PM

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Simpler still, magnitude is the size or length (always positive or zero) of a vector, independent of the vector direction. "Displacement" in Newtonian physics, is a vector, and has two elements, a signed length (positive, negative, or zero) and a direction.



#12
Jun1108, 11:36 PM

P: 6

thanks jeff i got it



#13
Aug608, 11:29 AM

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After reading the original post, I know the context is not about stars, but in case anyone is interested:
http://en.wikipedia.org/wiki/Absolute_magnitude ... not meant as distraction nor argument. 


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