Physics and Math Ch 4: Fluids

Question 1

Prompt

Question

Clarifier

Footnote

Answer 1

Answer

Clarifier

Image caption

Footnote

Question 2

Equation

Density

Answer 2

Question 3

Equation

Weight of a volume of fluid

Answer 3

Mass = density x volume

Question 4

Equation

Pressure

Answer 4

F = Force
A = Area

Question 5

Equation

Absolute pressure

Answer 5

P0 = pressure at suface of liquid (often atmospheric pressure)
z = depth of object in liquid

Question 6

Equation

Guage pressure

Answer 6

Pressure of only the fluid above the object, without the ambient/incident pressure

Question 7

Equation

Pascal’s principle

Answer 7

Used for hydraulic systems

Question 8

Equation

Buoyant force

Answer 8

Buoyant force is equal to weight of the fluid displaced, vector opposite to gravity.

Question 9

Equation

Poiseuille’s law

Answer 9

Q=flow rate
r=radius
delta P=pressure gradient
L=length of pipe

Only works for laminar flow

Question 10

Equation

Critical speed (fluid dynamics)

Answer 10

NR=Reynold’s number
D=diameter of pipe

Question 11

Equation

Continuity equation (fluid dynamics)

Answer 11

Q=flow rate (constant in a closed system)
Equation not used in physiological circulation b/c flow rate is not constant.

Question 12

Equation

Bernoulli’s equation

Answer 12

Question 13

Values

Atmospheric pressure in all common units

Answer 13

Question 14

Values

Density of liquid water in both common units

Answer 14