All Questions
Tagged with classical-mechanics pressure
102
questions
28
votes
6
answers
56k
views
Why does my door shut faster when the window is open?
I've noticed that if I shut my door when the window is open in a room, the door will tend to shut faster. If I shut the door when the window is closed with a normal force it will not fully close as if ...
- 431
16
votes
8
answers
3k
views
Can a ship float in a (big) bathtub?
I am confused.
Some sources say it is possible at least theoretically ( http://www.wiskit.com/marilyn/battleship.jpeg ) and some say it is not true ( http://blog.knowinghumans.net/2012/09/a-...
- 263
14
votes
2
answers
3k
views
How to model/simulate pressures and flows in a network of pipes
I'm having a hard time finding information on how to model/simulate this. I attached a couple files, both of which show an example tank & pump network. It's just nonsense that I made up for this ...
- 151
9
votes
3
answers
2k
views
Why does the Pascal's barrel experiment need a tall column of water?
This question is based on the content of this video .
The experiment consists of putting a tall, thin column of liquid on top of a barrel filled with water, so that the pressure caused by the large ...
9
votes
3
answers
19k
views
Why should fluids be confined for Pascal's Law to be applicable
When is Pascal's law about fluid pressure propagation applicable? Is
it applicable to a closed circular pipe with a pump rotating the
fluid, but not to a tub of water. Most statements require only ...
- 3,798
8
votes
1
answer
882
views
Why doesn't a blunt-tip nail crack the wood?
I came across this video, which shows you how to prevent the wood from cracking up at the ends while hammering a nail into it. The proposed solution is to make the nail tip blunt using a plier. This ...
- 12.5k
8
votes
4
answers
2k
views
Will a tennis ball go further if i hit it with the side of the racket?
If i hit a tennis ball 'properly' on the stringing, does it go further than if i rotate the racket 90 degrees in my hand and hit the ball with the same force, but on the side of the frame? I'm ...
6
votes
4
answers
36k
views
Physics of the inverted bottle dispenser
When you invert a water-bottle in a container, the water rises and then stops at a particular level --- as soon as it touches the hole of the inverted bottle. This will happen no matter how long your ...
- 1,283
6
votes
2
answers
4k
views
How come a whistling kettle starts whistling only when water boils, and not long before - due to hot air escaping under pressure?
A whistling kettle will start to whistle when the water boils and turns into a jet of steam which then exits the small aperture in the spout.
But why doesn't this happen much earlier - when the air ...
- 63
5
votes
2
answers
256
views
Help me understand extreme pressure
So we have the tragedy of the submersible being lost near the Titanic site.
I am trying to understand the pressure the vessel was under. I have heard the "$1$ atmosphere for every $10$ meters&...
- 153
5
votes
3
answers
876
views
Why does air get trapped below water pouring into a glass?
The drinking-water-tap at my workplace has a low pressure continuous stream of water. When I pour water into a glass which has at least about (depth) 5cm of water in it, surprisingly large air bubbles ...
- 510
4
votes
1
answer
233
views
Why isn't there a "parallel" Pressure as there is a parallel or shear Stress?
I had this question while I was reading the differences between pressure and stress.
As I have read:
Pressure is the intensity of external forces acting on a point, and it always act normal to the ...
user260844
4
votes
2
answers
4k
views
How does the Moon influence atmospheric pressure?
I have just read in the Telegraph an article entitled Moon overhead makes rainfall lighter, scientists conclude. In that article there is the following statement:
When the moon is overhead, its ...
- 97.9k
4
votes
2
answers
7k
views
Concept of surface tension: excess pressure inside an air bubble in a tank of water
I know the expression for excess pressure inside a LIQUID DROP is :
$$
P_2 - P_1 = 2S/R
$$
where $P_2$ is the pressure just inside the liquid drop and $P_1$ is the pressure outside the liquid drop ...
- 329
3
votes
3
answers
3k
views
Pressure in a tunnel
When entering a railway tunnel in a train I felt symptoms of overpressure (in my ears and sometimes eyes) many times. What is the physical principle of such overpressure? Clearly, there is a mass of ...
- 2,824