Question 1

A circular cylinder of height 1.20 m having faces of diameter 0.620 m is immersed in water of density 1.00 × 103 kg/m3 with its axis vertical so that its faces are parallel to the surface of the water.The upper face is 2.50 m below the surface of the water.The net force on this cylinder is observed to be 1120 N downward.Atmospheric pressure is 1.01 × 105 Pa.What is the weight of the cylinder?

Accepted Answer

A)   2430 N
B)   3550 N
C)   4670 N
D)   10,900 N
E)   12,100 NF) C) and D)
G) None of the above

Question 2

A piece of wood is floating in a bathtub.A second piece of wood sits on top of the first piece,and does not touch the water.If the top piece is taken off and placed in the water,what happens to the water level in the tub?

Accepted Answer

A)   It goes up.
B)   It goes down.
C)   It does not change.
D)   This cannot be determined without knowing the volume of the top piece of wood.E) A) and B)
F) A) and D)

Question 3

Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%.By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?

Accepted Answer

A)   48%
B)   52%
C)   50%
D)   46%
E)   54%F) B) and E)
G) D) and E)

Question 4

At a certain depth in the ocean,the absolute pressure is p.If you go to twice that depth (treating the water as incompressible)

Accepted Answer

A)   the absolute pressure will be 2p.
B)   the absolute pressure will be less than 2p.
C)   the absolute pressure will be greater than 2p.
D)   the gauge pressure will not change.
E)   the gauge pressure will increase but will not double.F) B) and E)
G) A) and C)

Question 5

Water flows through a pipe having a varying width.More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

Accepted Answer

A) True 
 B)False

Question 6

What is the radius of a sphere that has a density of 5000 kg/m3 and a mass of 6.00 kg?

Accepted Answer

A)   4.98 cm
B)   1.27 cm
C)   6.59 cm
D)   1.56 cm
E)   7.22 cmF) C) and D)
G) A) and D)

Question 7

A rock is suspended from a scale reads 20.0 N.A beaker of water (having a density of 1000 kg/m3) is raised up so the rock is totally submerged in the water.The scale now reads 12.5 N.What is the density of the rock?

Accepted Answer

A)   1.60 × 103 kg/m3
B)   2.50 × 103 kg/m3
C)   2.33 × 103 kg/m3
D)   3.00 × 103 kg/m3
E)   2.67 × 103 kg/m3F) C) and D)
G) A) and E)

Question 8

A 7.8-kg solid sphere,made of metal whose density is 2500 kg/m3,is suspended by a cord.When the sphere is immersed in water (of density 1000 kg/m3) ,what is the tension in the cord?

Accepted Answer

A)   46 N
B)   61 N
C)   76 N
D)   92 N
E)   110 NF) A) and C)
G) All of the above

Question 9

A 12,000-N car is raised using a hydraulic lift,which consists of a U-tube with arms of unequal areas,filled with incompressible oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons.The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm.The car rests on the piston on the wider arm of the U-tube.The pistons are initially at the same level.What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? (For purposes of this problem,you can neglect the weight of the pistons.)

Accepted Answer

A)   0.954 kN
B)   1.88 kN
C)   1.96 kN
D)   3.67 kN
E)   1.20 kNF) A) and D)
G) A) and E)

Question 10

An incompressible fluid flows steadily through a pipe that has a change in diameter.The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s.What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?

Accepted Answer

A)   0.32 m/s
B)   0.64 m/s
C)   1.28 m/s
D)   2.56 m/s
E)   5.12 m/sF) C) and D)
G) A) and C)

Question 11

Water is flowing in a horizontal pipe of diameter d.If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was,what should be the new diameter?

Accepted Answer

A)   d/4
B)   d/2
C)   d / 
D)   d 
E)   2dF) A) and B)
G) All of the above

Question 12

Water flows in the horizontal pipe shown in the figure.At A the diameter is 5.00 cm and at B the diameter is 4.00 cm The fluid in the manometer is mercury,which has a density of 13,600 kg/m3.The manometer reading h is 4.40 cm.We can treat water as an ideal fluid having a density of 1000 kg/m3.What volume of water is flowing through the pipe per second? 3.The manometer reading h is 4.40 cm.We can treat water as an ideal fluid having a density of 1000 kg/m3.What volume of water is flowing through the pipe per second?   A)  0.0206 m3/s B)  0.0426 m3/s C)  0.00560 m3/s D)  0.372 m3/s E)  0.186 m3/s" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0.0206 m3/s
B)   0.0426 m3/s
C)   0.00560 m3/s
D)   0.372 m3/s
E)   0.186 m3/sF) C) and D)
G) A) and C)

Question 13

Water,of density 1000 kg/m3,is flowing in a drainage channel of rectangular cross-section.The width of the channel is 15 m,the depth of the water is 8.0 m and the speed of the flow is 2.5 m/s.At what rate is water flowing in this channel?

Accepted Answer

A)   2.0 × 105 kg/s
B)   2.0 × 103 kg/s
C)   3.0 × 105 kg/s
D)   3.0 × 103 kg/s
E)   3.0 × 102 kg/sF) B) and E)
G) C) and E)

Question 14

Consider a very small hole in the bottom of a tank 20.0 cm in diameter filled with water to a height of 50.0 cm. Find the speed at which the water exits the tank through the hole.

Accepted Answer

A)   3.13 m/s
B)   9.80 m/s
C)   31.8 m/s
D)   34.9 m/sE) A) and B)
F) All of the above

Exam 18: Fluids

A 7.8-kg solid sphere,made of metal whose density is 2500 kg/m³,is suspended by a cord.When the sphere is immersed in water (of density 1000 kg/m³) ,what is the tension in the cord?

Correct Answer
verified

Correct Answer
verified

Water,of density 1000 kg/m³,is flowing in a drainage channel of rectangular cross-section.The width of the channel is 15 m,the depth of the water is 8.0 m and the speed of the flow is 2.5 m/s.At what rate is water flowing in this channel?

Correct Answer
verified

What is the radius of a sphere that has a density of 5000 kg/m³ and a mass of 6.00 kg?

Correct Answer
verified

A piece of wood is floating in a bathtub.A second piece of wood sits on top of the first piece,and does not touch the water.If the top piece is taken off and placed in the water,what happens to the water level in the tub?

Correct Answer
verified

At a certain depth in the ocean,the absolute pressure is p.If you go to twice that depth (treating the water as incompressible)

Correct Answer
verified

An incompressible fluid flows steadily through a pipe that has a change in diameter.The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s.What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?

Correct Answer
verified

Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%.By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?

Correct Answer
verified

Correct Answer
verified

A rock is suspended from a scale reads 20.0 N.A beaker of water (having a density of 1000 kg/m³) is raised up so the rock is totally submerged in the water.The scale now reads 12.5 N.What is the density of the rock?

Correct Answer
verified

Consider a very small hole in the bottom of a tank 20.0 cm in diameter filled with water to a height of 50.0 cm. Find the speed at which the water exits the tank through the hole.

Correct Answer
verified

Water is flowing in a horizontal pipe of diameter d.If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was,what should be the new diameter?

Correct Answer
verified

Water flows through a pipe having a varying width.More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

Correct Answer
verified

Correct Answer
verified

Exam 18: Fluids

A 7.8-kg solid sphere,made of metal whose density is 2500 kg/m3,is suspended by a cord.When the sphere is immersed in water (of density 1000 kg/m3) ,what is the tension in the cord?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Water,of density 1000 kg/m3,is flowing in a drainage channel of rectangular cross-section.The width of the channel is 15 m,the depth of the water is 8.0 m and the speed of the flow is 2.5 m/s.At what rate is water flowing in this channel?

Correct AnswerverifiedShow Answer

What is the radius of a sphere that has a density of 5000 kg/m3 and a mass of 6.00 kg?

Correct AnswerverifiedShow Answer

A piece of wood is floating in a bathtub.A second piece of wood sits on top of the first piece,and does not touch the water.If the top piece is taken off and placed in the water,what happens to the water level in the tub?

Correct AnswerverifiedShow Answer

At a certain depth in the ocean,the absolute pressure is p.If you go to twice that depth (treating the water as incompressible)

Correct AnswerverifiedShow Answer

An incompressible fluid flows steadily through a pipe that has a change in diameter.The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s.What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?

Correct AnswerverifiedShow Answer

Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%.By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A rock is suspended from a scale reads 20.0 N.A beaker of water (having a density of 1000 kg/m3) is raised up so the rock is totally submerged in the water.The scale now reads 12.5 N.What is the density of the rock?

Correct AnswerverifiedShow Answer

Consider a very small hole in the bottom of a tank 20.0 cm in diameter filled with water to a height of 50.0 cm. Find the speed at which the water exits the tank through the hole.

Correct AnswerverifiedShow Answer

Water is flowing in a horizontal pipe of diameter d.If you want to change the diameter of this pipe so that the speed of the water would be half as great as it was,what should be the new diameter?

Correct AnswerverifiedShow Answer

Water flows through a pipe having a varying width.More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A 7.8-kg solid sphere,made of metal whose density is 2500 kg/m³,is suspended by a cord.When the sphere is immersed in water (of density 1000 kg/m³) ,what is the tension in the cord?

Correct Answer
verified

Correct Answer
verified

Water,of density 1000 kg/m³,is flowing in a drainage channel of rectangular cross-section.The width of the channel is 15 m,the depth of the water is 8.0 m and the speed of the flow is 2.5 m/s.At what rate is water flowing in this channel?

Correct Answer
verified

What is the radius of a sphere that has a density of 5000 kg/m³ and a mass of 6.00 kg?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A rock is suspended from a scale reads 20.0 N.A beaker of water (having a density of 1000 kg/m³) is raised up so the rock is totally submerged in the water.The scale now reads 12.5 N.What is the density of the rock?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified