Go Back   Physics Help Forum > High School and Pre-University Physics Help > Thermodynamics and Fluid Mechanics

Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Nov 12th 2014, 09:35 AM   #1
Junior Member
 
Join Date: Nov 2014
Posts: 1
Fluid Mechanics Problem: Hydrostatic Pressure

Ok so ive done the first 2 question for this, the sketch and the resultant force, for my force i got a value of 3139.2N. But i cant figure out how to work out the centre of pressure? any help would be greatly appreciated. Im not looking for someone to tell me the answer. I just want to be helped to understand on how to get to the final answer. Any links will be very helpful. thank you
Attached Files
File Type: pdf question 2 fluid mechanics.pdf (368.8 KB, 20 views)
Theprof is offline   Reply With Quote
Old Nov 12th 2014, 03:04 PM   #2
MBW
Senior Member
 
MBW's Avatar
 
Join Date: Apr 2008
Location: Bedford, England
Posts: 668
I think this is perhaps best explained the long way...
The pressure on the window obviously varies from top to bottom, less at the top more at the bottom.
Consider the window in small horizontal strips.
You can readily work out the pressure on each strip.
Start 2 sums adding the pressures together, one starting from the top and the other starting from the bottom.
The higher pressures at the bottom will cause the sum starting at the bottom to increase more rapidly than the sum starting from the top.
Where the two sums reach the same value (somewhere closer to the bottom than the top) is the centre of pressure point you are after.

As you consider this and look at the geometry you will probably realise there is a shorter way to find the answer purely based on the geometry.
However jumping straight to the short-cut would perhaps mask the fuller meaning of the process.
Also this long-hand way can be extended to much more complex shapes, which might not be so amenable to short-cuts.
__________________
You have GOT to Laugh !
MBW is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Thermodynamics and Fluid Mechanics

Tags
fluid, hydrostatic, mechanics, pressure, problem



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Fluid mechanics problem asmpic Advanced Mechanics 3 Jul 3rd 2014 09:55 PM
pls I want to solve this problem (fluid mechanics) Humam Thermodynamics and Fluid Mechanics 3 May 13th 2014 01:45 PM
Fluid Mechanics Problem beng Advanced Mechanics 2 Feb 22nd 2014 04:38 PM
Problem in Fluid Mechanics PMB35 Thermodynamics and Fluid Mechanics 0 Apr 6th 2013 03:40 AM
Very important fluid mechanics problem mchulst Thermodynamics and Fluid Mechanics 1 Nov 21st 2008 05:49 PM


Facebook Twitter Google+ RSS Feed