Question 1

A material that resists any type of stress applied to it when the magnitude of the stress does not exceed some limit is a

Accepted Answer

A) liquid. 
B) solid. 
C) gas. 
D) liquid crystal. 
E) fluid. 
A) liquid. 
B) solid. 
C) gas. 
D) liquid crystal. 
E) fluid. B

Question 2

The pressure drop in a tube carrying a viscous fluid is described by

Accepted Answer

A) Bernoulli's principle. 
B) Pascal's principle. 
C) Archimedes' principle. 
D) Poiseuille's equation. 
E) Newton's Second law. 
A) Bernoulli's principle. 
B) Pascal's principle. 
C) Archimedes' principle. 
D) Poiseuille's equation. 
E) Newton's Second law. D

Question 3

At position A within a tube containing fluid that is moving with steady laminar flow, the speed of the fluid is 12.0 m/s and the tube has a diameter 12.00 cm. At position B, the speed of the fluid is 18.0 m/s and the tube has a diameter 6.00 cm. What is the ratio of the density of the fluid at position A to the density of the fluid at position B?

Accepted Answer

A) 3.00 
B) 0.167 
C) 0.375 
D) 0.333 
E) 0.750 
A) 3.00 
B) 0.167 
C) 0.375 
D) 0.333 
E) 0.750 C

Question 4

The buoyant force acting on an object is equal to the weight of the object.

Accepted Answer

A) True 
 B)False

Question 5

A parallel plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. It takes a force 1.20 N applied to the plate to sustain this speed. What is the viscosity of the oil?

Accepted Answer

A) 6.00 kg/(m∙s) 
B) 20.0 kg/(m∙s) 
C) 60.0 kg/(m∙s) 
D) 0.200 kg/(m∙s) 
E) 200 kg/(m∙s) 
A) 6.00 kg/(m∙s) 
B) 20.0 kg/(m∙s) 
C) 60.0 kg/(m∙s) 
D) 0.200 kg/(m∙s) 
E) 200 kg/(m∙s)

Question 6

FIGURE 13-7  
-Water flows out of a large reservoir through 5-cm diameter pipe. The pipe connects to a 3-cm diameter pipe that is open to the atmosphere, as shown in Fig. 13-7. What is the speed of the water in the 5-cm pipe?

Accepted Answer

A) 2.25 m/s 
B) 3.19 m/s 
C) 3.91 m/s 
D) 8.86 m/s 
E) 10.2 m/s 
A) 2.25 m/s 
B) 3.19 m/s 
C) 3.91 m/s 
D) 8.86 m/s 
E) 10.2 m/s

Question 7

A valve is closed and the fluid within a pipe is stationary. When the valve is opened, fluid flows through the pipe. What happens to the pressure in the pipe when the valve is opened?

Accepted Answer

A) The direction of the pressure change depends on the direction of the fluid flow. 
B) The direction of the pressure change depends on the density of the fluid. 
C) The pressure decreases. 
D) The pressure increases. 
E) The pressure remains the same. 
A) The direction of the pressure change depends on the direction of the fluid flow. 
B) The direction of the pressure change depends on the density of the fluid. 
C) The pressure decreases. 
D) The pressure increases. 
E) The pressure remains the same.

Question 8

FIGURE 13-5  
-A cylinder, semicircular in cross-section, 10.0 m long and 5.00 m in radius, is completely submerged, with its flat 5.00 m * 10.0 m side horizontal and 8.00 m below the water surface, as shown in Fig. 13-5. What is the force on the curved surface of the half-cylinder? Neglect atmospheric pressure.

Accepted Answer

A) 2.00 × 106 N 
B) 2.50 × 106 N 
C) 3.00 × 106 N 
D) 3.50 × 106 N 
E) 4.00 × 106 N 
A) 2.00 × 106 N 
B) 2.50 × 106 N 
C) 3.00 × 106 N 
D) 3.50 × 106 N 
E) 4.00 × 106 N

Question 9

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3. What is the speed of the air when it leaves the nozzle?

Accepted Answer

A) 123 m/s 
B) 176 m/s 
C) 88.0 m/s 
D) 45.7 m/s 
E) 29.3 m/s 
A) 123 m/s 
B) 176 m/s 
C) 88.0 m/s 
D) 45.7 m/s 
E) 29.3 m/s

Question 10

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?

Accepted Answer

A) 1050 kg/m3 
B) 1040 kg/m3 
C) 1030 kg/m3 
D) 960 kg/m3 
E) 56.1 kg/m3 
A) 1050 kg/m3 
B) 1040 kg/m3 
C) 1030 kg/m3 
D) 960 kg/m3 
E) 56.1 kg/m3

Question 11

A piece of aluminum with a mass of 1.0 kg and density of 2700 kg/m3 is suspended from a string and then completely immersed in a container of water. The density of water is 1000 kg/m3.
(a) Determine the volume of the piece of aluminum.
(b) Determine the tension in the string after the metal is immersed in the container of water.

Accepted Answer

(a) 3.7 ×

Question 12

The fact that a dew drop is spherical is best described in terms of

Accepted Answer

A) gravitation. 
B) gauge pressure. 
C) surface tension. 
D) Archimedes' principle. 
E) viscosity. 
A) gravitation. 
B) gauge pressure. 
C) surface tension. 
D) Archimedes' principle. 
E) viscosity.

Question 13

On planet X, the pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface, the pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3.
(a) What is the atmospheric pressure at the surface of the lake?
(b) What is the acceleration of gravity on planet X?

Accepted Answer

(a) 3.00 ×

Question 14

A liquid has a specific gravity of 0.68. What is its density?

Accepted Answer

A) 680 kg/m3  
B) 1360 kg/m3  
C) 1000 kg/m3  
D) 6800 kg/m3  
A) 680 kg/m3  
B) 1360 kg/m3  
C) 1000 kg/m3  
D) 6800 kg/m3

Question 15

A U-tube is open to the atmosphere at both ends. Water is poured into the tube until the water rises part-way along the straight sides, and then some oil with a density of 920 kg/m3 is poured into one end. This causes the water surface on that side of the tube to go down by 5.50 mm, and the surface on the other side to go up by the same amount. How much higher is the top surface of the oil on that side of the tube compared with the surface of the water on the other side of the tube?

Accepted Answer

A) 0.96 mm 
B) 1.2 mm 
C) 0.44 mm 
D) 1.2 cm 
E) 1.1 cm 
A) 0.96 mm 
B) 1.2 mm 
C) 0.44 mm 
D) 1.2 cm 
E) 1.1 cm

Question 16

A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 × 104 Pa. What is the diameter of contact between the ball and the floor?

Accepted Answer

A) 2.8 cm 
B) 1.4 cm 
C) 1.7 cm 
D) 2.1 cm 
E) 5.6 cm 
A) 2.8 cm 
B) 1.4 cm 
C) 1.7 cm 
D) 2.1 cm 
E) 5.6 cm

Question 17

FIGURE 13-6  
-Water flows in the horizontal pipe shown in Fig. 13-6. At A the area is 25.0 cm2 and the speed of the water is 2.00 m/s. At B the area is 16.0 cm2. The fluid in the manometer is mercury, which has a density of 13,600 kg/m3. What is the manometer reading h?

Accepted Answer

A) 0.546 cm 
B) 1.31 cm 
C) 2.81 cm 
D) 2.16 cm 
E) 3.36 cm 
A) 0.546 cm 
B) 1.31 cm 
C) 2.81 cm 
D) 2.16 cm 
E) 3.36 cm

Question 18

As the speed of a moving fluid increases, the pressure in the fluid

Accepted Answer

A) increases. 
B) remains constant. 
C) decreases. 
D) may increase or decrease, depending on the viscosity. 
A) increases. 
B) remains constant. 
C) decreases. 
D) may increase or decrease, depending on the viscosity.

Question 19

A barge is 15.0 m wide and 75.0 m long and has vertical sides. The bottom of the hull is 1.20 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water?

Accepted Answer

A) 22.6 MN 
B) 13.2 MN 
C) 1.35 MN 
D) 1.13 MN 
E) 11.3 MN 
A) 22.6 MN 
B) 13.2 MN 
C) 1.35 MN 
D) 1.13 MN 
E) 11.3 MN

Question 20

If all fluid flow within a volume of fluid can be traced as streamlines, the fluid flow is

Accepted Answer

A) turbulent flow. 
B) incompressible flow. 
C) nonviscous flow. 
D) laminar flow. 
E) irrotational flow. 
A) turbulent flow. 
B) incompressible flow. 
C) nonviscous flow. 
D) laminar flow. 
E) irrotational flow.

Exam 13: Fluids

A material that resists any type of stress applied to it when the magnitude of the stress does not exceed some limit is a

The pressure drop in a tube carrying a viscous fluid is described by

The buoyant force acting on an object is equal to the weight of the object.

A parallel plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. It takes a force 1.20 N applied to the plate to sustain this speed. What is the viscosity of the oil?

FIGURE 13-7 -Water flows out of a large reservoir through 5-cm diameter pipe. The pipe connects to a 3-cm diameter pipe that is open to the atmosphere, as shown in Fig. 13-7. What is the speed of the water in the 5-cm pipe?

A valve is closed and the fluid within a pipe is stationary. When the valve is opened, fluid flows through the pipe. What happens to the pressure in the pipe when the valve is opened?

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3. What is the speed of the air when it leaves the nozzle?

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?

The fact that a dew drop is spherical is best described in terms of

A liquid has a specific gravity of 0.68. What is its density?

A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 × 104 Pa. What is the diameter of contact between the ball and the floor?

FIGURE 13-6 -Water flows in the horizontal pipe shown in Fig. 13-6. At A the area is 25.0 cm2 and the speed of the water is 2.00 m/s. At B the area is 16.0 cm2. The fluid in the manometer is mercury, which has a density of 13,600 kg/m3. What is the manometer reading h?

As the speed of a moving fluid increases, the pressure in the fluid

A barge is 15.0 m wide and 75.0 m long and has vertical sides. The bottom of the hull is 1.20 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water?

If all fluid flow within a volume of fluid can be traced as streamlines, the fluid flow is

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A parallel plate of area 400 cm² is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. It takes a force 1.20 N applied to the plate to sustain this speed. What is the viscosity of the oil?

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m³ and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m³. What is the speed of the air when it leaves the nozzle?

A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 × 10⁴ Pa. What is the diameter of contact between the ball and the floor?

FIGURE 13-6 -Water flows in the horizontal pipe shown in Fig. 13-6. At A the area is 25.0 cm² and the speed of the water is 2.00 m/s. At B the area is 16.0 cm². The fluid in the manometer is mercury, which has a density of 13,600 kg/m³. What is the manometer reading h?