All Questions
62
questions
3
votes
1
answer
94
views
Does having a liquid (less dense than ice) above a floating (in water) ice cube, change the fact that the water level remains constant when ice melts?
An ice cube floats in water, with a liquid (less dense than ice) above it. When the ice cube melts will the water level go up, down or remain constant?
- 135
0
votes
1
answer
83
views
Why are there 2 ways of predicting if an object will float or not?
I thought about it for a second, I have always thought that for an object to float it had to be less dense than water, and if it had more density then it would sink. But then if it sinks or floats ...
- 45
0
votes
1
answer
88
views
Why is this the "no bubbles" condition?
I'm reading through the "Waves" textbook from the Berkley series. In section 7.3, water waves are described. First, the condition that water is incompressible is derived as follows (assuming ...
- 1,775
3
votes
3
answers
319
views
Are number of molecules per unit volume constant (say in water)?
I have a very basic doubt. I knew that
$$ \rho = \frac{m}{V} $$
And since mass is constant so volume may decrease or increase depending upon density. But suppose I have water in a beaker and I read it ...
- 265
-1
votes
1
answer
947
views
Can ice ever sink in the water? [closed]
It is generally taught in schools that ice is less dense than water, which is why ice is seen to float on the water. But isn't ice heavier compared to water at a temperature quite above 4 degrees ...
- 307
1
vote
1
answer
72
views
How density of fluids is would affect inertia?
I was watching that movie Event Horizon and they use water as an instrument to protect passengers of a space vessel from 30G acceleration, so my question is about a similar scenario, what would happen ...
- 11
1
vote
3
answers
415
views
Are there any chemical reactions which result in the density of a water decreasing?
I'm not a chemist or a physicist, I'm not even college educated, so forgive me if I use the wrong terminology or do not understand the question I am asking.
I understand that dissolving salt into ...
- 13
0
votes
1
answer
155
views
Calculating the leakage of water in a pressurized vessel based on initial and final pressures?
Let's say you have a piping system containing liquid water under high pressure. One section of the pipe gets isolated, and it is initially at the same pressure as when it was isolated. we can think of ...
- 1
2
votes
1
answer
458
views
Displacement of water - Archimedes' principle
Floating objects displace their weight and objects that are completely submerged in water displace their volume. So, my question is that does a floating object displace less water than an immersed ...
- 29
0
votes
1
answer
228
views
How to control the balance of a floating object?
I have this 3D printed object which I hope to float water. I added my printed object to a piece of foam (Glued) and then gently put it on the surface of the water. Every time I put it, it flips over ...
19
votes
5
answers
3k
views
Are water molecules at the surface closer or farther apart than the molecules inside?
My lecturer says that since the energy of the molecules on the surface is higher (less negative), then at equilibrium there will be less molecules on the surface, hence the molecules on the surface ...
- 449
0
votes
2
answers
184
views
Why isnt a taller object more buoyant?
If an objects buoyancy is dependant on the difference in pressure between its two faces, why arent taller objects more buoyant since the pressure difference is larger?
0
votes
2
answers
111
views
Why can't water flow fast when the impact speeds up? (the incompressibility)
I'm a high school student studying physics in Korea! Please understand my poor English skills.
In the text below, the liquid is said to be destructive and incompressible. And he says, "I the ...
-1
votes
2
answers
86
views
Can a body, made of semi-light material, theoretically float on water (ocean) if it has enough airtight space under it? What are the risks? [closed]
Hello scientists and amateurs,
Basically, if I put a quite big airtight container on water and use it as a type of float to wander around ocean (Let's say pretty big, size of a half a football field). ...
- 1
-1
votes
1
answer
39
views
Is there a way to calculate how high the water will go? [closed]
Calculate how high the pump pumps water into the reservoir to fill it to 68O hl. When filling the reservoir, there will be a work done of 9MJ. (ρ = 1000 kg / m2)
I am having a real hard time with this ...
