Hans-Peter E. Kristiansen

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727 reputation
413
bio website none
location Aarhus, Denmark
age 37
visits member for 2 years, 6 months
seen Apr 16 at 19:27

Stud. Scient. Casual LaTeX user. TikZ newbie.


May
6
comment Does the slinky base stay perfectly level during the initial free fall
@007: Thanks for the reference. Interesting to see some calculation, that I could not have done quickly myself. They are calculating an estimate for the characteristic time, not the forces involved.
May
6
comment Does the slinky base stay perfectly level during the initial free fall
No. The answer just states the obviously: 1. Center of mass is in free fall. 2. There is tension pulling up. I am asking if the balance is perfect.
May
6
asked Does the slinky base stay perfectly level during the initial free fall
Mar
2
comment Reference for phase diagrams of elements
@Qmechanic: You are correct - please close it.
Jan
17
awarded  Popular Question
Nov
27
awarded  Caucus
Nov
13
comment How wide does a wall of ice need to be to stay in place?
ρhg ~ 1000kg/m^3 * 200m * 10m/s^2 = 2000000kg/m/s^2 = 2MPa. So I think that it is safe to assume, that all of the ice will be in phase I. -but what is the minimum width of a 200 m wall?
Nov
10
revised How wide does a wall of ice need to be to stay in place?
Deleted a couple of non relevant questions.
Nov
10
accepted How do we recognize hardware used in accelerator physics
Nov
10
asked How wide does a wall of ice need to be to stay in place?
Oct
24
awarded  Yearling
Aug
9
comment Why are the inner products of the eigenfunctions of an operator with a discrete eigenvalue spectrum guaranteed to exist?
I think that this question is (also) suitable for a math forum. -you might get better answers.
Jul
12
comment Are there devices which convert thermal energy to electric energy?
@Tarek: So you seek something that you already know doesn't exist!?
Jun
11
comment Why isn't the symmetric twin paradox a paradox?
Good explanation +1. But you do need general relativity, to explain what happens in the acceleration phase. That is also why you elegantly skip that part. General relativity is also needed to explain the non-symetry of the normal twin paradox(one stays in the same inertial frame, and the other goes trough an acceleration at one point).
Jun
8
revised How do we recognize hardware used in accelerator physics
edited tags
Jun
5
comment Pressure of sealed in liquid nitrogen
82 atm is not a very high lower limit.- but I will accept, that the answer is not simple.
Jun
4
comment Reference for phase diagrams of elements
@dmckee: See my comment to Alexander. I will accept your Wolfram link as answer to this question. - have posted a new one: physics.stackexchange.com/questions/29523/…
Jun
4
comment Reference for phase diagrams of elements
@Alexander: One thing that the phase diagram shows is that the ideal gas law can not be used to make the estimate. The answer is not 694 atm. physics.stackexchange.com/questions/29523/…
Jun
4
comment Pressure of sealed in liquid nitrogen
@Pygmalion: A very dangerous experiment, if you do not have a rough estimate :o)
Jun
4
asked Pressure of sealed in liquid nitrogen