Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?

Accepted Answer

A)  11.6 × 105 Pa 
B)  11.6 × 104 Pa 
C)  2.9 × 105 Pa 
D)  2.9 × 104 Pa 
A)  11.6 × 105 Pa 
B)  11.6 × 104 Pa 
C)  2.9 × 105 Pa 
D)  2.9 × 104 Pa

Question 3

A fluid is flowing with an average speed of 1.50 m/s through a tube that has a radius of 2.00 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?

Accepted Answer

A)  0.00179 Ns/m2 
B)  0.00562 Ns/m2 
C)  0.0278 Ns/m2 
D)  0.0134 Ns/m2 
E)  0.00335 Ns/m2 
A)  0.00179 Ns/m2 
B)  0.00562 Ns/m2 
C)  0.0278 Ns/m2 
D)  0.0134 Ns/m2 
E)  0.00335 Ns/m2

Question 4

FIGURE 15-1  
-Each of the three containers shown in Figure 15-1 weighs the same amount and is filled with water to the same level. All three have the same surface area in contact with the table. Which of the following statements are true?
I. The pressure at the bottom surface of the container is the same for all three containers.
II. The force exerted by the water on the bottom surface of the container is the same
For all three containers.
III. The force exerted by the container on the table is the same for all three containers.

Accepted Answer

A)  Statements I, II, and III are true. 
B)  Only Statements I and II are true. 
C)  Only Statements II and III are true. 
D)  Only Statements I and III are true. 
E)  None of the statements are true. 
A)  Statements I, II, and III are true. 
B)  Only Statements I and II are true. 
C)  Only Statements II and III are true. 
D)  Only Statements I and III are true. 
E)  None of the statements are true.

Question 5

FIGURE 15-8  
-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 Figure 15-8. 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 6

A boat loaded with ice is floating in a swimming pool. If the ice is thrown into the pool, the water level in the pool, once the ice stops bobbing and floats steadily,

Accepted Answer

A)  rises. 
B)  falls. 
C)  stays the same. 
D)  There is not enough information to answer this question. 
A)  rises. 
B)  falls. 
C)  stays the same. 
D)  There is not enough information to answer this question.

Question 7

FIGURE 15-12  
-Water flows in the vertical pipe shown in Figure 15-12. At A the area is 25.0 cm2 and the speed of the water is 3.30 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)  8.27 cm 
C)  1.11 cm 
D)  3.11 cm 
E)  6.35 cm 
A)  0.546 cm 
B)  8.27 cm 
C)  1.11 cm 
D)  3.11 cm 
E)  6.35 cm

Question 8

Consider three drinking glasses. All three have the same area base, and all three are filled to the same depth with water. Glass A is cylindrical. Glass B is wider at the top than at the bottom, and so holds more water than A. Glass C is narrower at the top than at the bottom, and so holds less water than A. Which glass has the greatest liquid pressure at the bottom?

Accepted Answer

A)  Glass A 
B)  Glass B 
C)  Glass C 
D)  All three have equal non-zero pressure at the bottom. 
E)  All three have zero pressure at the bottom. 
A)  Glass A 
B)  Glass B 
C)  Glass C 
D)  All three have equal non-zero pressure at the bottom. 
E)  All three have zero pressure at the bottom.

Question 9

State Pascal's Principle

Accepted Answer

An external pressure applied t

Question 10

The equation of continuity is a statement of the

Accepted Answer

A)  conservation of linear momentum. 
B)  conservation of mass. 
C)  conservation of energy. 
D)  conservation of kinetic energy. 
E)  conservation of angular momentum. 
A)  conservation of linear momentum. 
B)  conservation of mass. 
C)  conservation of energy. 
D)  conservation of kinetic energy. 
E)  conservation of angular momentum.

Question 11

Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is

Accepted Answer

A)  more. 
B)  less. 
C)  the same. 
D)  Cannot be determined from the information given. 
A)  more. 
B)  less. 
C)  the same. 
D)  Cannot be determined from the information given.

Question 12

The flow of water emerging from a hole in a container is best described in terms of

Accepted Answer

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

Question 13

When atmospheric pressure changes, what happens to the absolute pressure at the bottom of a pool?

Accepted Answer

A)  It does not change. 
B)  It increases by a lesser amount. 
C)  It increases by the same amount. 
D)  It increases by a greater amount. 
E)  It depends on the depth of the pool. 
A)  It does not change. 
B)  It increases by a lesser amount. 
C)  It increases by the same amount. 
D)  It increases by a greater amount. 
E)  It depends on the depth of the pool.

Question 14

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 15

Motor oil, with a viscosity of 0.250 Ns/m2, is flowing through a tube that has a radius of 3.00 mm and is 1.00 m long. The drop in pressure is 200 kPa. What is the average speed of the oil?

Accepted Answer

A)  0.800 m/s 
B)  0.900 m/s 
C)  1.00 m/s 
D)  1.10 m/s 
E)  1.20 m/s 
A)  0.800 m/s 
B)  0.900 m/s 
C)  1.00 m/s 
D)  1.10 m/s 
E)  1.20 m/s

Question 16

FIGURE 15-10  
-Water flows in the horizontal pipe shown in Figure 15-10. At A the area is 25.0 cm2 and the speed of the water is 2.80 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)  4.24 cm 
E)  3.36 cm 
A)  0.546 cm 
B)  1.31 cm 
C)  2.81 cm 
D)  4.24 cm 
E)  3.36 cm

Question 17

FIGURE 15-2  
-Water flows in a pipe as shown in Figure 15-2. The pipe is horizontal at points A and B, then rises in elevation while decreasing in diameter and is again horizontal at points C and D. The vertical tubes at B and D are open at the top, but they enter the pipe and bend at right angles along the centerline of the pipe with their mouths facing the flow (these are Pitot tubes). Water enters the Pitot tube and rises until the hydrostatic pressure in the tube balances the pressure at the mouth of the tube. Because no more water enters the tube, the speed of the water just outside the mouth of the tube is zero m/s. The pressure in the pipe is unaffected by the Pitot tube. Which of the following statements is correct?

Accepted Answer

A)  hB > hD 
B)  hB D 
C)  hB = hD 
D)  The answer depends on the direction of the flow. 
E)  The answer depends on the speed of the flow. 
A)  hB > hD 
B)  hB D 
C)  hB = hD 
D)  The answer depends on the direction of the flow. 
E)  The answer depends on the speed of the flow.

Question 18

The buoyant force acts through the center of mass of the displaced fluid.

Accepted Answer

A) True 
 B)False

Question 19

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.

Question 20

The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0 m × 3.0 m × 2.0 m?

Accepted Answer

A)  0.32 kg 
B)  3.1 kg 
C)  31 kg 
D)  1.9 kg 
E)  19 kg 
A)  0.32 kg 
B)  3.1 kg 
C)  31 kg 
D)  1.9 kg 
E)  19 kg

Exam 15: Fluids

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

The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?

A fluid is flowing with an average speed of 1.50 m/s through a tube that has a radius of 2.00 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?

A boat loaded with ice is floating in a swimming pool. If the ice is thrown into the pool, the water level in the pool, once the ice stops bobbing and floats steadily,

FIGURE 15-12 -Water flows in the vertical pipe shown in Figure 15-12. At A the area is 25.0 cm2 and the speed of the water is 3.30 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?

State Pascal's Principle

The equation of continuity is a statement of the

Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is

The flow of water emerging from a hole in a container is best described in terms of

When atmospheric pressure changes, what happens to the absolute pressure at the bottom of a pool?

Motor oil, with a viscosity of 0.250 Ns/m2, is flowing through a tube that has a radius of 3.00 mm and is 1.00 m long. The drop in pressure is 200 kPa. What is the average speed of the oil?

FIGURE 15-10 -Water flows in the horizontal pipe shown in Figure 15-10. At A the area is 25.0 cm2 and the speed of the water is 2.80 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?

The buoyant force acts through the center of mass of the displaced fluid.

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

The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0 m × 3.0 m × 2.0 m?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric Potential Energy

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm²?

FIGURE 15-12 -Water flows in the vertical pipe shown in Figure 15-12. At A the area is 25.0 cm² and the speed of the water is 3.30 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?

Motor oil, with a viscosity of 0.250 Ns/m², is flowing through a tube that has a radius of 3.00 mm and is 1.00 m long. The drop in pressure is 200 kPa. What is the average speed of the oil?

FIGURE 15-10 -Water flows in the horizontal pipe shown in Figure 15-10. At A the area is 25.0 cm² and the speed of the water is 2.80 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?

The density of air is 1.29 kg/m³. What is the mass of the air inside a room 4.0 m × 3.0 m × 2.0 m?