A cylinder filled with water to half a metre will exert a pressure of
- 49.0 Pa.
- 4900 Pa.
- 9800 Pa.
Explanation
Pressure due to a liquid column is rho x g x h. For water this is 1000 kg/m3 x 9.8 m/s2 x 0.5 m = 4900 Pa. Using the full one-metre height would give 9800 Pa, but only half a metre of head acts here.
Richiegeee asking:
Hi, can someone please explain?
Community Comments (4)
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dimky Posts: 514 03.06.2015 / 22:56
Pressure = density * gravity * height = 1000 (for water) * 10 * 0.5 = 5000 Pa. Answer is 4900 Pa because gravity is slightly less than 10 (9.81 to be exact)
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Richiegeee Posts: 7 03.06.2015 / 23:09
Thanks
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Alberto1989 Posts: 1 29.01.2019 / 23:43
Hi dimky, wasn’t a PRESSURE = force / area? There is another question wich ask the uniti of measure of the pressure, and the correct answer is N/m*2. Thanks
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Jordi Posts: 198 14.06.2020 / 16:08
the answer to your question is from formula:p=ρgh p is pressure and ρ is density.So we know for standard that ρ of water is 1000kg/m^3 g=10 or 9.81 and h=0.5 so the answer is 4900Pa
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