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1d
comment How do the flow equations relate to the actual situation?
@tpg2114 I agree with you, but I think this is more a difference in terminology, i.e., some people call the condition at x=0 initial condition as well (not me!)
1d
comment How do the flow equations relate to the actual situation?
I have a small remark with respect to your post. You name the equation incompressible, but still want to solve for $\rho$. Later you mention four unknowns (instead of 5). This is a contradiction.
Oct
2
comment Weighing with One-Foot Scale
@Jim Obviously, for this you have to include measurement errors.
Oct
1
comment Drag force on a flat plate
What is $C$ for your case?
Sep
30
comment Branching lemon drop “smoke rings”
I encountered this movie, which provides some proof for your answer: youtube.com/watch?v=Tfi8BLca07M
Sep
25
comment An alternate approach to find variation of gravitational acceleration with respect to depth of an object in Earth
I think it is more a mathematical problem like this. But you can only approximate them as point particles in the far field limit. You will have to integrate the forces itself, i.e., the y-componentn of the 1/r^2. You see why people like the spherical shell approach?
Sep
24
comment Degree of freedom paradox for a rigid body
Why would the number of constraint depend on $N$ for a rigid body?
Sep
24
comment Will a tug-of-war battle damage my climbing rope
Just use a rope that is depricated for climbing purposes.
Sep
17
comment Forces while squeezing a toothpaste tube
@KyleKanos Now you are using a balance between pressure and inertia. But you already ignore pressure. You have to prove that pressure gradients are smaller than inertia.
Sep
16
comment Movement of a cylinder filled with water
Awesome, I once studied this case for a course (long ago). Then I analyzed it one an incline, hitting a wall at the bottom. It will 'reflect' in a funny way (with a delay).
Sep
16
comment Forces while squeezing a toothpaste tube
@KyleKanos Of course, but how can one prove/demonstrate that?
Sep
16
comment Forces while squeezing a toothpaste tube
Why are you neglecting $\nabla p$?
Sep
14
comment How to determine your position underground?
@ChrisWhite But, if you want to now your depth wrt the local surface, wouldn't that fall within any magnitude of the error that you can obtain with this method?
Sep
10
comment Formula for Electrical Arc Length
I see your point, but in that case, don't answer, but leave it as a comment, downvote the question, and flag it for closing. That is the way it should work on SE.
Sep
9
comment Hoop rolling inside a circular hole
It would help to put the sketch in your question. People generally do not like to follow links.
Sep
9
comment Does one really need classical physics in order to understand quantum physics?
Yes, you need it. Because you need to learn the way physicists think. That is different from the way mathematicians think.
Sep
8
comment A problem says : a car starts from rest and undergoes a constant acceleration. It travels 5 m in the…?
This might be a duplicate: What is the intuition behind $gt^2/2$ equalling the distance something falls after $t$ seconds?
Sep
7
comment Autocorrelation function for deterministic nonlinear dynamical systems
The autocorrelation you show looks a bit weird to me. I would expect it to be maximum at $\tau=0$ (by definition) and periodic with the same period of your $x$. Also, didn't you mean to write $\dfrac{d\mathbf{x}}{dt}$ in your equation?
Sep
7
comment Why does this perpetuum mobile not work?(Gases and Densities)
possible duplicate of What is the fallacy in this infinite motion machine?
Sep
7
comment Formula for Electrical Arc Length
Basically this is a link-only answer. Would you consider adding a few more details in your post? Otherwise it is only valuable as a comment rather than an answer.