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Old Jan 15th 2016, 08:02 PM   #1
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free fall fluid of body

why when the fluid container is accelearting upward , the pressure gradient in z direction is -2 ρ g ?
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Old Jan 17th 2016, 09:57 AM   #2
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Do you understand that if a = 0 the pressure gradient is pg? Well, if acceleration upward = g, then the fluid is exerted to both acceleration due to gravity = g plus acceleration of the fluid itself = g, for a sum of 2g. Think of it this way: if you are in a rocket accelerating upward at 9.8m/s^2 you will experience 2 "g's" of force acting on your body.
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