• Jan 5th 2008, 08:16 PM
Peacewanters007
time is vector quantity or scalar bn y??????if scalar yy??
thanks 4 spending ur time
• Jan 5th 2008, 08:31 PM
Jhevon
Quote:

Originally Posted by Peacewanters007
time is vector quantity or scalar bn y??????if scalar yy??
thanks 4 spending ur time

it's a scalar quantity, since it does not show direction (i.e. you can't have negative time)
• Jan 5th 2008, 08:40 PM
mr fantastic
Quote:

Originally Posted by Peacewanters007
time is vector quantity or scalar bn y??????if scalar yy??
thanks 4 spending ur time

At this level time would be considered a scalar quantity.
• Jan 5th 2008, 08:44 PM
Jhevon
Quote:

Originally Posted by mr fantastic
At this level time would be considered a scalar quantity.

"at this level"...:D that makes you sound so overly smart. i like to use that line when i'm tutoring precalc kids.

Student: what's the square root of -2?

Jhevon: at your level there is no square root of -2, hehehe (Devil)
• Jan 5th 2008, 09:11 PM
mr fantastic
Quote:

Originally Posted by Jhevon
"at this level"...:D that makes you sound so overly smart. i like to use that line when i'm tutoring precalc kids.

Student: what's the square root of -2?

Jhevon: at your level there is no square root of -2, hehehe (Devil)

Indeed. A little knowledge can be a dangerous thing lol!

On the other hand, I always like to use the line as insurance against someone jumping in and saying "Hmpppph, well ...... it just so happens that ...." ;)

And you never know .... one of those pre-calc kids might just otherwise come back in 10 yrs time and say "You rat, you liar. You told me .... and I believed you, man. I. Believed. You. sob ......"
• Jan 5th 2008, 09:15 PM
Jhevon
Quote:

Originally Posted by mr fantastic
Indeed. A little knowledge can be a dangerous thing lol!

On the other hand, I always like to use the line as insurance against someone jumping in and saying "Hmpppph, well ...... it just so happens that ...." ;)

And you never know .... one of those pre-calc kids might just otherwise come back in 10 yrs time and say "You rat, you liar. You told me .... and I believed you, man. I. Believed. You. sob ......"

hehe, yeah, i know, that's how i'd feel. but i'd just tell them that's the way of the world. "hey, when i was in kindergarden, they told me i can't subtract a bigger number from a smaller one. now i do that everyday. how do you think that makes me feel?! suck it up and stop being a cry baby!"

anyway, at what "level" or in what context would time be a vector quantity?
• Jan 5th 2008, 09:22 PM
mr fantastic
Quote:

Originally Posted by Jhevon
hehe, yeah, i know, that's how i'd feel. but i'd just tell them that's the way of the world. "hey, when i was in kindergarden, they told me i can't subtract a bigger number from a smaller one. now i do that everyday. how do you think that makes me feel?! suck it up and stop being a cry baby!"

anyway, at what "level" or in what context would time be a vector quantity?

I think our friendly neighbourhood quantum field theorist topsquark would be best qualified to show off *ahem* I mean give an answer to that ...... (But I'll put my 2 cents in if he passes)
• Jan 5th 2008, 11:14 PM
CaptainBlack
Quote:

Originally Posted by Jhevon

anyway, at what "level" or in what context would time be a vector quantity?

In a space time with more than one time like co-ordinate

RonL
• Jan 6th 2008, 12:40 AM
mr fantastic
Quote:

Originally Posted by CaptainBlack
In a space time with more than one time like co-ordinate

RonL

And here I was just going to string things along for awhile ...... ;)

Actually there was a recent article in New Scientist (13 Oct 2007 pp 36-39) that might make accessible follow-up reading to CaptainBlack's answer. A Google search of two-time physics might also provide interest.
• Jan 6th 2008, 05:16 AM
malaygoel
Time can be considered as a vector with positive direction pointing from past to future along the direction in which all senses follow. It is still difficult to find a negative time because no way our senses can observe in a direction against the above mentioned.
One might claim that I can run the video of a glass breaking in reverse to see it join back again --- thus I am seeing time go in negative direction. However, while the videotape is being run, time is going to flow from past to future.
• Jan 6th 2008, 06:08 AM
topsquark
No need for me to put my two cents in. Everything to be said has been said and said well. :)

-Dan