# Rotating drum

• 04-09-2020, 04:52 AM
carlo_pescatori
Rotating drum
[COLOR=#353C41][FONT=Roboto]Guys & Girls,[/FONT][/COLOR]
[COLOR=#353C41][FONT=Roboto]Problem is this: Suppose I have a round drum, rotating about its main vertical axis. Top and bottom are closed off. The drum is partially filled with a liquid. How do I calculate the force that the liquid exerts on the top and bottom lid of the drum. Let's ignore gravity.[/FONT][/COLOR]
[COLOR=#353C41][FONT=Roboto]I have attached 2 calculations I did. The picture I found somewhere on the web.[/FONT][/COLOR]
[COLOR=#353C41][FONT=Roboto]Which one of the two is wrong and why? Or are they both wrong???[/FONT][/COLOR]
[COLOR=#353C41][FONT=Roboto]Looking forward to hear from you![/FONT][/COLOR]
• 04-09-2020, 06:26 AM
jboggs
If you're ignoring gravity their both wrong. Without gravity there would be no liquid at the bottom. The hole in the middle would go all the way from the top to the bottom. A perfect cylinder.
• 04-09-2020, 06:45 AM
carlo_pescatori