WK2

Question 1

What’s the hydrostatic equation?

Answer 1

dp= change in pressure
dz= change in vertical position (height)

Question 2

1) What’s the hydrostatic equation? (applied)

2) And equation for gauge pressure?

Answer 2

1) p0= a constant pressure (atmospheric pressure)

z0= baseline, datum

cant use for gases, as they have variable pressure

2) row= density
g= gravitational
h= height

Question 3

equation for force due to pressure

Answer 3

double integral of the pressure

• when pressure is not applied uniformly

Question 4

equation for moment due to pressure

Answer 4

force times the moment arm

Question 5

buoyancy force equation

Answer 5

Question 6

define pressure

vector or scalar?

relationship with height?

Answer 6

magnitude of the normal stress at the boundary of a fluid

scalar- independent of the orientation of the boundary, it’s isotropic (acts the same in all directions)

pressure decreases with height

Question 7

in the horizontal plane….. is constant

complete the sentence

Answer 7

in the horizontal plane pressure is constant

Question 8

for …. density, ….. pressure rises ….. in ….. direction

complete the sentence

Answer 8

for constant density, liquid pressure rises linearly in vertical direction

Question 9

define equilibrium

Answer 9

sum of all forces in all directions = 0

sum of all bending moment at any given point = 0

Question 10

equation for absolute pressure?

Answer 10

atmosphere pressure + gauge pressure