Depth of Lake Surface for 3x Atmospheric Pressure: 20m

  • Thread starter Thread starter Neb0
  • Start date Start date
  • Tags Tags
    Pressure
Click For Summary
To determine the depth at which the total pressure in a lake equals three times the atmospheric pressure, the equation P = pgh is used, incorporating atmospheric pressure. The calculation shows that at a depth of 30 meters, the pressure equals 300 kPa, which is three times the standard atmospheric pressure. However, the answer key states the correct depth is 20 meters. The discrepancy was resolved by the poster, who later clarified that they figured out the solution independently. The discussion highlights the importance of correctly applying pressure equations in fluid mechanics.
Neb0
Messages
3
Reaction score
0

Homework Statement


At what depth a lake surface is the total pressure 3 times the normal atmospheric pressure?

Homework Equations



P=pgh this is the equation for liquid pressure.

About total pressure we should add also the atmospheric pressure which is pushing from above the surface of the liquid.

The Attempt at a Solution


Pl + Patm=pgh
so, 300kPa=1000kg/m3*10m/s2*h... the answer is 30m, but in the answer key is 20m.
 
Last edited:
Physics news on Phys.org
Thank you but don't need. Figured it out.Sorry for posting it too early.
 

Similar threads

Understanding Vapour Pressure & Temperature Difference
  • · Replies 18 ·
Replies
18
Views
3K
What Is the Largest Pressure Measurable by a 70cm Water Column Manometer?
  • · Replies 8 ·
Replies
8
Views
3K
Explaining Pressure & Depth Relationships in Fluids Using Halliday & Resnick
  • · Replies 4 ·
Replies
4
Views
2K
Pressure at surface and bottom of pool
  • · Replies 13 ·
Replies
13
Views
3K
Pressure in Liquids: How Does It Affect Volume?
  • · Replies 20 ·
Replies
20
Views
2K
Calculation of atmospheric presure
  • · Replies 9 ·
Replies
9
Views
1K
A water-bottle demonstration of atmospheric pressure
  • · Replies 6 ·
Replies
6
Views
2K
What Is the Blood Pressure in the Head When Standing?
  • · Replies 1 ·
Replies
1
Views
2K
Find volume of pesticide after pressure decreases
  • · Replies 3 ·
Replies
3
Views
1K
Torricelli's law and pressure at the drain
  • · Replies 2 ·
Replies
2
Views
2K