help with pressure on a plate submerged underwater

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Aventura

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what is the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater.... when i plug all the values in and use F=(1000)(9.8)(2)(4) and get F=78400N, although the correct answer is 39200N and which is half of the value I found... What did I do wrong?
 
Aventura said:
what is the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater.... when i plug all the values in and use F=(1000)(9.8)(2)(4) and get F=78400N, although the correct answer is 39200N and which is half of the value I found... What did I do wrong?
Click to expand...

Are you sure the answer is 39200 N - or is it 39200 N/m2?
 
Aventura said:
what is the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater.... when i plug all the values in and use F=(1000)(9.8)(2)(4) and get F=78400N, although the correct answer is 39200N and which is half of the value I found... What did I do wrong?
Click to expand...
You posted this to "Calculus", but you appear to be plugging into some given algebraic formula (rather than, say, doing integration). Please reply with the formula you are using, including the definitions of all variables. For instance, what is the source of the "1000" value that you "plugged in" (but do not appear to have been given in the exercise). (I'm pretty sure I know what it is, but do you?) For which variable have you plugged in the "2"? Thank you! ;)
 
sorry about the confusion.. I am not sure that I am posting in the correct thread because this is more of a physics problem, but we are learning this material in my Calc2 class so I posted it under Calculus.

What is the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater?


I tried to just use the formula: Force= (Density of water)(Area)(Depth)(gravity), plugging in the values Force=(1000kg/m^3)(2m^2)(4m)(9.8m/sec^2) and get 78400 N, when in reality the real answer is supposed to equal 39,200 N/m^2.

I hope this clears up any confusion
 
Aventura said:
sorry about the confusion.. I am not sure that I am posting in the correct thread because this is more of a physics problem, but we are learning this material in my Calc2 class so I posted it under Calculus.

What is the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater?


I tried to just use the formula: Force= (Density of water)(Area)(Depth)(gravity), plugging in the values Force=(1000kg/m^3)(2m^2)(4m)(9.8m/sec^2) and get 78400 N, when in reality the real answer is supposed to equal 39,200 N/m^2.

I hope this clears up any confusion
Click to expand...

But

pressure = (Force) / (Area)

You have calculated the force on the plate - now divide by the area of the plate to get the pressure on the plate.
 
Subhotosh Khan said:
But

pressure = (Force) / (Area)

You have calculated the force on the plate - now divide by the area of the plate to get the pressure on the plate.
Click to expand...

Thank you once again, I totally looked past the fact that I needed to solve for Pressure rather than Force
 
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