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Thrust on immersed surfaces |
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| Feb2-13, 03:15 AM | #1 |
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Thrust on immersed surfaces
A fuel tank contains oil of a relative density of 0.7 on one side there is a circular trap door of 1.8m in diameter. The fuel level is 1.8m above the top edge of the door calculate the thrust on the door.
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| Feb2-13, 03:31 AM | #2 |
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Hi Twowaypower! Welcome to PF!
 Show us what you've tried, and where you're stuck, and then we'll know how to help! 
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| Feb2-13, 04:10 AM | #3 |
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I tried using
P=pgh. Which works out as 700*9.81*3.6= 24.7212kN Then thought many had to put that int P=FA. Which as area is Pi r^2 area works out as 2.54m^2 That gave me 62.7918kN. I have used 1/2pgbh^2 to find out thrust on submerge rectangular objects but couldn't make that one work either. The answers in my book is 47.2 kN but I just can't get it. :/ |
| Feb2-13, 04:23 AM | #4 |
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Thrust on immersed surfaces
Hi Twowaypower!
Hint: 47.2/62.7918 = 3/4 |
| Feb2-13, 05:22 AM | #5 |
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I was scratching my head for so long and it was so obvious. Thank you. Really need that.
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