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How is it possible for birds to fly without flapping their wings (glide)? Which principle is responsible for this ability? How does the shape of the wing allow for gliding?

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Bernoulli's law, aerodynamic shape of wi...

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One of the terms in Bernoulli's equation is ½ ñv2. Which of these quantities does it represent?


A) kinetic energy
B) kinetic energy per unit volume
C) kinetic energy change in time
D) pressure per unit volume

E) B) and C)
F) A) and C)

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The fluid flow rate is 1.1 L per minute, and the tube has a diameter of 4 mm and a length of 10 cm. What is the viscosity of the fluid if the pressure drops 5.3 Pa over the length of the tube?


A) 5 Pa s
B) 2 Pa s
C) 0.2 Pa s
D) 5 × 10-2 Pa s

E) B) and C)
F) A) and B)

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Which of the following is a property of an ideal fluid?


A) viscosity
B) incompressibility
C) turbulent flow
D) density fluctuations

E) None of the above
F) B) and C)

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A higher number of blood cells affects the flow resistance of blood through blood vessels. Resistance varies as a function of pressure difference.

A) True
B) False

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Water flows at 3 m/s through a horizontal pipe where the pressure is 2.3 × 105 Pa. Where the pipe constricts to a quarter of its original area, what is the pressure?


A) 1.6 × 105 Pa
B) 2.2 × 105 Pa
C) 2.3 × 105 Pa
D) 3.1 × 105 Pa

E) None of the above
F) A) and B)

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Which of these statements describes a flow rate?


A) change of volume with time
B) change of mass with time
C) change of density with time
D) change of velocity with time

E) B) and D)
F) A) and D)

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