All Questions
19
questions
1
vote
2
answers
66
views
Work performed by hydrostatic pressure
One should be able to show mathematically that the hydrostatic work done by an environment on an object undergoing a volume change $\Delta v$ should be $p \Delta v$, where $p$ is the (constant) ...
- 754
1
vote
2
answers
209
views
How is pressure affected by horizontal force in fluid?
In the situation shown above, Point A is just near the wall at negligible distance. But how is pressure at A is due to weight of water and atmospheric pressure only,why does it not have any pressure ...
- 111
0
votes
1
answer
126
views
How does pressure act evenly in all directions in interactions between solids?
Pressure is a scalar quantity, and I think I understand this in the context of pressures exerted by gases and liquids. However, I struggle to understand this in the context of solids. If I use a ...
- 1
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
2
votes
2
answers
329
views
Pressure in an accelerated container
Let us take a closed container completely filled with some liquid.Let us assume that the container moves with some acceleration in the horizontal direction.
Usually when we have such situations,we ...
2
votes
2
answers
321
views
Air Pressure Acting Below Object
Consider an object resting on a surface. If I had to find the net force on the object, I would write an equation as follows: weight = normal force.
But what about the air pressure that's acting on the ...
- 251
0
votes
1
answer
41
views
Why does the red arrow generate smoke when flying at high speed on a moon rocket?
Why does the red arrow generate smoke when flying at high speed on a moon rocket? I think it is because of the structure, the air in this location has expanded, so the air in this location has ...
- 2,040
2
votes
1
answer
84
views
Why don't comets just vapourize away?
As far as I know, comets are in a freefall around the sun. That would mean, net acceleration due to gravity is almost zero because R =m (g-a) where R is reaction force. Now pressure is force per ...
- 61
1
vote
1
answer
523
views
Why we consider pressure do not vary with height incase a gas in a vessel?
Why pressure do not vary with respect to height incase a gas contained in a vessel and atmospheric air pressure varies with respect to height.
for example we consider constant pressure in a mercury ...
- 175
1
vote
3
answers
2k
views
Can you sail up/down a moving river on a windless day?
It's not possible to sail into the wind directly, but only at an angle. It can be shown (it may help for below) by considering the pressure forces on a flat sail and flat keel that sailing upwind is ...
- 274
0
votes
1
answer
74
views
What's the difference between dP<0 and dP>0?
Assume a situation shown in the image1 below. The column is filled with gas. The number density is denoted as $n$, and the mass of each particle is $m$. Take the axis downward. By considering the ...
- 433
0
votes
1
answer
20
views
How do you draw the force in a clamped connection of 2 cilinders?
Something like this:
There is pressure between the cilinders, and for some calculations we use the formula p=F/A, therefore F=p*A
If you were to draw the force F, where would you draw it?
If the ...
- 139
-1
votes
1
answer
159
views
Using dimensional analysis to guess formula ; too many flaws? [duplicate]
A horizontal pipe of uniform cross sectional area A empties into a bucket, filling it at a rate R(unit volume per unit time). The speed of the fluid within the pipe is v. Guess a formula for the ...
- 254
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 ...
-1
votes
1
answer
55
views
Why an object with double length have the same friction? [closed]
I didn't really got the highlighted part.
- 353