Timeline for Why does a ping pong ball bounce higher when it is dropped together with a cup of water?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 29, 2020 at 6:11 | comment | added | Gert | You are correct and I'm wrong. I edited my answer. Thank you for pointing out my error. +1 from me. | |
| Jun 28, 2020 at 17:40 | comment | added | Gert | The law of energy conservation is certainly valid if you take all energies into account. Which you don't do! | |
| Jun 28, 2020 at 17:37 | comment | added | atarasenko | The law of energy conservation is still valid: the work done to permanently deform the cup changes its energy and is partially turned into heat. See the first law of thermodynamics | |
| Jun 28, 2020 at 16:55 | comment | added | Gert | And your (dismissed) energy balance doesn't take into account the work done to permanently deform the cup, as witnessed by me. | |
| Jun 28, 2020 at 16:09 | comment | added | Gert | In the 'final analysis' I don't think it matters much: we're not here to create a precise model, although it would be possible to refine what we have and empirically verify it. | |
| Jun 28, 2020 at 16:07 | comment | added | Gert | My derivation starts from the idea the collision is INELASTIC, so kinetic and potential energy are NOT conserved. Hence the use of conservation of momentum. Your $E_{cup}=E_{water}=E_{heat}=0$ argument just makes me giggle! | |
| Jun 28, 2020 at 16:04 | history | edited | atarasenko | CC BY-SA 4.0 |
added 14 characters in body
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| Jun 28, 2020 at 15:58 | history | answered | atarasenko | CC BY-SA 4.0 |