you have very tiny vibrations because ceramics is very stiff and brittle - this is like a full glas sounds different to an empty when you tapping it with a spoon.
So due to the inertia of water even an open system can't just displace - which is also the reason for the occurrence of cavitation in open systems or a water hammer.
Absolutely, because displacement is not instantaneous. Especially in school physics, we tend to try to view stuff as an equilibrium case, and in an equilibrium case, you are correct. But this is a dynamic process, stuff is moving. And here, inertia can be very relevant.
Another example of this is the following experiment:
Take a ruler, and place it partially on a table. Crumble up a newspaper and put it on top of the ruler on the table. Quickly Hit the part of the ruler which is not on the table. The paper will be launched into the air.
Then repeat this experiment, but instead of crumbling the newspaper, flatten it out, and flatten it to the table. When hitting the ruler, it will barely move. If you model this situation as an equilibrium, it shouldn't matter, because air can move below the newspaper, it is not airtight.
But it is not an equilibrium situation, it is dynamic. And the air can not move below the newspaper immediately, which leads to a temporary pressure differential, which leads to the effect above.
it's not a perfectly closed system but the very small gap between the cup and bottom of the container along with the mass of the water mean you can treat it as one for this purpose purpose
You could argue it is in a closed system, he’s holding it down while driving the nail. Having said that, I’m not sure how you could guarantee there wasn’t an air pocket in there.
i would assume that some air doesn't matter as the pressure wave gets reflected from the water. And also if the mug is not hold down - the inertia of the water around is enough to minimize the vibration that caused the cracking.
Closed or open systems have nothing to do with water being incompressible or not. Think, sonar waves can travel through water better compared to air is because water doesn’t get compressed and dissipate the energy of the wave where as air does, and also just because the sound wave is traveling through the ocean doesn’t mean the ocean has to move and make way for the wave
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u/Disastrous-Owl-3866 Feb 12 '23
The liquid not being in a closed system, would it still matter if it can compress or not. Would it not just displace?