Forces On Submerged Surfaces

Question 1

How does hydrostatic pressure vary with depth?

Answer 1

Linearly

Question 2

Pressures at any equal depth in a continuous fluid are …..

Answer 2

Equal

Question 3

Pascal’s law

Answer 3

Pressure at a point acts equally in all directions

Question 4

Pressure from a fluid on a boundary acts at …………. to that boundary

Answer 4

right angles

Question 5

Define centroid

Answer 5

The point where the force is applied to a surface with a uniform load

Question 6

Pressure at centroid x cross sectional area

Answer 6

FR=(γhc)A

Question 7

Distance from O that FR acts

Answer 7

yR=Iₓ/ycA

Iₓ=second moment of the area=∫ₐy²dA

Question 8

Second moment of area

Answer 8

Moment of inertia
Iₓ=∫ₐy²dA
Iy=∫ₐx²dA

Question 9

Parallel axis theorem

Answer 9

Iₓ=Iₓc+Ay²c

Question 10

yR

Answer 10

yR=(Iₓc/ycA)+yc

Question 11

3 things for forces on curves surfaces

Answer 11

Forces on little elements are not parallel

Vector sum of all forces is needed to find resultant force

Consider fluid volume enclosed by curved surface

Question 12

Resultant force

Answer 12

FR=√((FH)²+(Fᵥ)²)