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May
1
comment If a bell is rung in a perfect vacuum and is suspended by opposing magnets will it ever stop ringing?
You should say that the magnetic force does not act as a damper-the only dissipation is the friction as the objects deform.
May
1
comment If a bell is rung in a perfect vacuum and is suspended by opposing magnets will it ever stop ringing?
You have missed that the only energy dissipation is friction in the distortion of the objects. Without that, the vibration would go on forever.
Apr
30
comment When pressure is exerted on parallel hydraulic pistons, do they start extending at the same time?
@Time4Tea: In a real system there may be a flow restriction, but we have to assume (no info otherwise) that the pressure source can provide all the flow we need to maintain the pressure. It is similar to neglecting friction. In real case friction is there, but in problems like this we say it is negligible. The same for pressure drops.
Apr
23
awarded  Yearling
Apr
20
answered How much work do I need to convert 300ml of water from 25°C to 3°C?
Apr
13
answered Series of parallel thermal resistance connection for this enclosure?
Apr
12
comment Is fuelless aviation possible?
The more specific you make your question, the better the answers you are likely to get. No, you can't fly solely on gravity because it pulls down. Both answers (and the link you give) are using buoyancy to counteract gravity.
Apr
11
answered I were to travel to the other side of the world then is this logic possible? If no, why?
Apr
11
revised Is fuelless aviation possible?
add info
Apr
11
answered Is fuelless aviation possible?
Apr
10
answered What does it mean to “contract” a tensor identity?
Apr
9
answered Calculating average energy stored in Li-Po battery
Apr
6
comment Why does the bathroom become hot after a bath?
If the drops were already water, moving them to the walls won't generate any heat. True, if you cause vapor that was in the bath to condense you will. I don't see why shower water would cause this.
Apr
4
answered How can anti-matter annihilate matter?
Apr
4
revised Do batteries provide electrons
added 54 characters in body
Apr
4
answered Do batteries provide electrons
Mar
17
answered Will heating water vapor induce equilibrium?
Mar
16
answered Can energy bend space?
Feb
25
answered Neutrino Reaction: Is the Following Reaction Allowed?
Feb
25
comment Paradox in electrostatics in relation to Gaussian surfaces?
You are claiming that if your first holds true there is no flux out the non-common faces because the total flux is zero. Logically, that is correct, as a false antecedent makes an implication true. I don't think that is useful. Then we know the flux integrated over a sphere is proportional to the charge within it. If the flux through the other five faces were zero, the flux through the common face would reflect the charge inside the cube, but it isn't so you can't make that argument.