Even if you draw a circle on a piece of paper, that circle has some thickness to it: the thickness of the ink or paper. If there are no 2-D objects, then does the second dimension really exist, or is it just hypothetical?
If 2-D -- the dimension we're most familiar with, other than 3-D -- doesn't exist, then what does that say about other dimensions, like 4-D?
And why is 4-D commonly thought of to be time? The other dimensions 1-3 are all about spatial relationships; why is 4-D so special that it diverges from that? (Rudy Rucker might argue that it's not time but simply an extra dimension tacked on to ours, like the Z-axis on the 2-D X/Y-axis.)
2007-03-15 12:31:07 · 6 answers · asked by no_good_names_left_17 3 in Science & Mathematics ➔ Physics
In response to the third reply below, even a "2-D" image on the computer screen has the thickness of a pixel...duh!
2007-03-15 12:46:31 · update #1
Regarding 2-D objects: A ring (Kerr) singularity would have a radius but no thickness. This is the result of a rotating black hole, as a traditional singularity cannot have angular momentum.
The fourth dimension is oftentimes depicted as a hypercube, as suggested by Rudy Rucker, etc as you stated.
2007-03-15 12:53:41 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Your shadow. Two dimensional, for sure. If you don't believe that, I'd be forced to ask you to measure it's thickness.
The fourth dimension is thought of as time because when we depict a moving object in three dimensional space, we must also specify the time as well as location. Now you have the graph - X,Y,Z and T.
2007-03-15 13:25:44 · answer #2 · answered by LeAnne 7 · 0⤊ 0⤋
Two dimensional objects do not exist in this universe. Everything in our univers has 4 dimensions; length, width, height and time. Even though 2-D objects don't exist, yes the second dimension does exist. We could not exist without the second dimension. Where would you be withouth width?
2007-03-15 12:40:11 · answer #3 · answered by Bob 6 · 0⤊ 1⤋
It's more a representation of an object than an object itself.
A square is a two-dimensional cube.
A circle is a two-dimensional sphere.
2007-03-15 12:35:24 · answer #4 · answered by Anonymous · 0⤊ 0⤋
DUH.
Look at my picture. It is 2-D and it exists
2007-03-15 12:40:27 · answer #5 · answered by amansscientiae 3 · 1⤊ 1⤋
I agree with amansscientiae up here, lol;)
2007-03-15 12:57:36 · answer #6 · answered by Yahoo! 5 · 0⤊ 1⤋