What is the gauge pressure due to water at a depth of 20 m? (density 1000 kg/m^3, g = 10 m/s^2)
Answer and explanation
Correct answer: B. 200000 Pa
- Step 1: The pressure of a liquid column is p = rho g h.
- Step 2: p = 1000 x 10 x 20 = 200000 Pa.
Answer
200000 Pa.
Why not the others: The gravitational field strength is needed; leaving out g or the density gives the smaller values, and an extra factor 10 the larger one.
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