## 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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 Blog Entries: 27 Recognitions: Gold Member Homework Help Science Advisor Hi Twowaypower! Welcome to PF! Show us what you've tried, and where you're stuck, and then we'll know how to help!
 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. :/

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