Civil Engineering - Hydraulics - Discussion
Discussion Forum : Hydraulics - Section 1 (Q.No. 5)
5.
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is
Discussion:
42 comments Page 4 of 5.
Prashant said:
7 years ago
How (total pressure/atm pressure) is equal to the pressure head of water?
Please explain anyone.
Thanks.
Please explain anyone.
Thanks.
WAQAR AHMED AWAN said:
8 years ago
We know that;
1kg=9.81N and 1m=100cm.
let atmosppheric pressure at top surface be; P1=denssity*g*h=0.1kg/cm2=0.1*9.81*100*100=9810N/m2.
let pressure at heigt of 2.5m be p2=0.8*1000*9.81*2.5=19620N/M2.
now total pressureP =p1+p2=9810+19620=29430N/m2.
NOW pressure in terms of water =P/p1=29430/9810=3m so option C is correct.
1kg=9.81N and 1m=100cm.
let atmosppheric pressure at top surface be; P1=denssity*g*h=0.1kg/cm2=0.1*9.81*100*100=9810N/m2.
let pressure at heigt of 2.5m be p2=0.8*1000*9.81*2.5=19620N/M2.
now total pressureP =p1+p2=9810+19620=29430N/m2.
NOW pressure in terms of water =P/p1=29430/9810=3m so option C is correct.
Gurmeet said:
8 years ago
Simply P = density * gh.
Suresh yadav said:
8 years ago
Yes, your answer is correct. Thank you @Dipesh.
Makar said:
8 years ago
Yes, correct @Dipesh.
Makar said:
8 years ago
1 kg/m2 = 1000kg/cm2 this are correct.
Er. Dipesh yadav said:
8 years ago
Atmospheric pressure = 0.1 * 9.81 * 100 * 100 = 9810 N/m2.
Pressure at 2.5m depth = 0.8 * 9810 * 2.5 = 19620 N/m2.
Total pressure at depth 2.5m = 9810 + 19620 = 29430 N/m2.
Height in terms of water= 29430/9810 = 3m.
Pressure at 2.5m depth = 0.8 * 9810 * 2.5 = 19620 N/m2.
Total pressure at depth 2.5m = 9810 + 19620 = 29430 N/m2.
Height in terms of water= 29430/9810 = 3m.
Sashaus said:
8 years ago
S1 h1 = s2 h2 or £1h1 = £2h2.
£ = density , s= sp.gr.
1000 h1 = 800 * 2.5.
H1 = 2 + 1 (initially pressure is 1) = 3.
£ = density , s= sp.gr.
1000 h1 = 800 * 2.5.
H1 = 2 + 1 (initially pressure is 1) = 3.
Jeevan said:
8 years ago
Specific Gravity of oil is .8 & water is 1. So oil has less density the water therefor, water shows less head. So, the answer will be 2m not 3.
Anonymous said:
8 years ago
I think the answer should be 2 m. Because the atm pressure will be same for both oil surface and water surface. So it will be neglected.
Please reply if anyone thinks I'm wrong. And do explain. Thanks.
Please reply if anyone thinks I'm wrong. And do explain. Thanks.
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