Mechanical Principles - Fluid Systems?

Posted on 2016-05-17 18:49:00 in Engineering by JANDER

I have some Mechanical Principles questions that I don't understand. Can anyone explain the steps and the answer? 

1) Part of a sea defence consists of asection of vertical rectangular concrete wall 4 metres high and 7 metres long. Taking the density of the sea water to be 1025 kg/m3 (3 is for cubed), calculate: 
a) the average hydrostatic thrust on this section at an instant when the sea is tranquil and just reaches the top of the sea wall; 
b) the distance from the sea floor of the centre of pressure on the wall section; 
c) the overturning moment experienced by the wall section. 

2) A submersible whose total volume is 60 m3 (3 for cubed) is completely submerged in a part of the sea where the density is 1026 kg/m3 (3 for cubed). Determine the upthrust on the submersible.

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