Question 1

In addition to its weight,what force is needed to lift a wire ring of radius 2.0 cm from the surface of blood plasma? The surface tension of blood plasma is 7.3 × 10¯2 N/m.

Accepted Answer

A) 1.8E+1 N 
B) 3.7E-2 N 
C) 9.2E-3 N 
D) 1.8E-2 N 
A) 1.8E+1 N 
B) 3.7E-2 N 
C) 9.2E-3 N 
D) 1.8E-2 N

Question 2

A ping-pong ball has an average density of 0.0840 g/cm3 and a diameter of 3.80 cm.What force would be required to keep the ball completely submerged under water?

Accepted Answer

A) 1.000 N 
B) 0.788 N 
C) 0.516 N 
D) 0.258 N 
A) 1.000 N 
B) 0.788 N 
C) 0.516 N 
D) 0.258 N

Question 3

A uniform pressure of 5.7 × 105 N/m2 is applied to all six sides of a copper cube.What is the percentage change in volume of the cube? (for copper,B = 14 × 1010 N/m2)

Accepted Answer

A) 0.00070% 
B) 0.00040% 
C) 0.0000020% 
D) 0.00041% 
A) 0.00070% 
B) 0.00040% 
C) 0.0000020% 
D) 0.00041%

Question 4

The bulk modulus of a material,as a meaningful physical property,is applicable to which of the following?

Accepted Answer

A) only solids 
B) only liquids 
C) only gases 
D) solids,liquids and gases 
A) only solids 
B) only liquids 
C) only gases 
D) solids,liquids and gases

Question 5

The SI units for viscosity are N·s/m2.Another commonly used unit for viscosity is the poise,where 10 poise = 1 N·s/m2.The poise is a fairly large unit,and it is more common to use the centipoise.Which of the following is equal to the centipoise?

Accepted Answer

A) 10−3 N·s/m2 
B) 10−2 N·s/m2 
C) 10−1 N·s/m2 
D) 102 N·s/m2 
A) 10−3 N·s/m2 
B) 10−2 N·s/m2 
C) 10−1 N·s/m2 
D) 102 N·s/m2

Question 6

​A water pipe with inner radius r1 is connected to a junction with two equal-diameter pipes.Water flows through each of the two pipes with a speed of v.If the diameter of each of the two pipes is ¼ the diameter of the single pipe,what is the flow rate in the single pipe?

Accepted Answer

A) ​v/8 
B) ​​v​/4 
C) ​4​v 
D) ​8​v 
A) ​v/8 
B) ​​v​/4 
C) ​4​v 
D) ​8​v

Question 7

Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10−3 N⋅s/m3).The water is 9.0 cm deep and is allowed to stand for 25 minutes.What is the greatest terminal velocity of the particles still in suspension at that time?​

Accepted Answer

A) 3.0E-5 m/s 
B) 4.5E-5 m/s 
C) 7.5E-5 m/s 
D) 6.0E-5 m/s 
E) ​8.4E-5 m/s 
A) 3.0E-5 m/s 
B) 4.5E-5 m/s 
C) 7.5E-5 m/s 
D) 6.0E-5 m/s 
E) ​8.4E-5 m/s

Question 8

As ice floats in water,about 10% of the ice floats above the surface of the water.If we float some ice in a glass of water,what will happen to the water level as the ice melts?

Accepted Answer

A) The water level will rise 10% of the volume of the ice that melts. 
B) The water level will rise,but not as much as the 10% indicated in answer 
C) The water level will remain unchanged. 
D) The water level will become lower. 
A) The water level will rise 10% of the volume of the ice that melts. 
B) The water level will rise,but not as much as the 10% indicated in answer 
C) The water level will remain unchanged. 
D) The water level will become lower.

Question 9

An ideal fluid,of density 850 kg/m3,flows at 0.560 kg/s through a pipe of radius 0.0250 m.What is the fluid speed?

Accepted Answer

A) 0.773 m/s 
B) 0.00419 m/s 
C) 285 m/s 
D) 0.336 m/s 
E) 0.599 m/s 
A) 0.773 m/s 
B) 0.00419 m/s 
C) 285 m/s 
D) 0.336 m/s 
E) 0.599 m/s

Question 10

A container is filled with water and the pressure at the bottom of the container is P.Then the container is emptied halfway and topped off with oil of density 0.8 × 103 kg/m3,which floats on top of the water.What is the pressure at the bottom of the container now?

Accepted Answer

A) a pressure  P 
D) This is unable to be determined with the information given. 
E) ​a pressure < 0.5P 
A) a pressure  P 
D) This is unable to be determined with the information given. 
E) ​a pressure < 0.5P

Question 11

A fluid has a density of 1 040 kg/m3.If it rises to a height of 1.60 cm in a 1.50-mm diameter capillary tube,what is the surface tension of the liquid? Assume a contact angle of zero.

Accepted Answer

A) 0.0612 N/m 
B) 0.122 N/m 
C) 6.12 N/m 
D) 0.245 N/m 
E) 12.2 N/m 
A) 0.0612 N/m 
B) 0.122 N/m 
C) 6.12 N/m 
D) 0.245 N/m 
E) 12.2 N/m

Question 12

An ideal fluid,of density 900 kg/m3,flows at 4.80 m/s through a level pipe with radius of 0.22 cm.The pressure in the fluid is 1.3 × 105 N/m2.This pipe connects to a second level pipe,with radius of 0.72 cm.Find the speed of flow in the second pipe.

Accepted Answer

A) 51 m/s 
B) 1.5 m/s 
C) 0.45 m/s 
D) 16 m/s 
E) 4.9 m/s 
A) 51 m/s 
B) 1.5 m/s 
C) 0.45 m/s 
D) 16 m/s 
E) 4.9 m/s

Question 13

A blimp is filled with 440 m3 of helium.How big a payload can the balloon lift? (The density of air is 1.29 kg/m3;the density of helium is 0.178 kg/m3. )

Accepted Answer

A) 396 kg 
B) 568 kg 
C) 78.3 kg 
D) 489 kg 
E) 646 kg 
A) 396 kg 
B) 568 kg 
C) 78.3 kg 
D) 489 kg 
E) 646 kg

Question 14

A heavily loaded boat is floating in a pond.The boat sinks because of a leak.What happens to the surface level of the pond?

Accepted Answer

A) It stays the same. 
B) It goes up. 
C) It goes down. 
D) More information is needed to reach a conclusion. 
A) It stays the same. 
B) It goes up. 
C) It goes down. 
D) More information is needed to reach a conclusion.

Question 15

A solid object is made of two materials,one material having density of 2 500 kg/m3 and the other having density of 6 000 kg/m3.If the object contains equal volumes of the materials,what is its average density?

Accepted Answer

A) 3 529 kg/m3 
B) 4 250 kg/m3 
C) 5 250 kg/m3 
D) 8 500 kg/m3 
E) more information is needed 
A) 3 529 kg/m3 
B) 4 250 kg/m3 
C) 5 250 kg/m3 
D) 8 500 kg/m3 
E) more information is needed

Question 16

A container is filled with water and the pressure at the container bottom is P.If the container is instead filled with oil having specific gravity 0.80,what new bottom pressure results?

Accepted Answer

A) a pressure  P 
D) This is unable to be determined with the information given. 
A) a pressure  P 
D) This is unable to be determined with the information given.

Question 17

The equation of continuity applied to an incompressible ideal fluid flowing through a pipe of varying diameter is based on what of the following being conserved for the fluid in the pipe?

Accepted Answer

A) its kinetic energy 
B) its momentum 
C) its flow rate 
D) its potential energy 
A) its kinetic energy 
B) its momentum 
C) its flow rate 
D) its potential energy

Question 18

The condition for onset of turbulent flow is that the Reynolds Number reaches what value?

Accepted Answer

A) 1 000 
B) 2 000 
C) 3 000 
D) 4 000 
A) 1 000 
B) 2 000 
C) 3 000 
D) 4 000

Question 19

Bar One has a Young's modulus that is bigger than that of Bar Two.This indicates Bar One

Accepted Answer

A) is longer than Bar Two. 
B) has a greater cross-sectional area than Bar Two. 
C) has a greater elastic limit than Bar Two. 
D) is made of material that is different from Bar Two. 
A) is longer than Bar Two. 
B) has a greater cross-sectional area than Bar Two. 
C) has a greater elastic limit than Bar Two. 
D) is made of material that is different from Bar Two.

Question 20

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0080 m3/s.The average fluid speed in the pipe is

Accepted Answer

A) 0.040 m/s. 
B) 0.0050 m/s. 
C) 0.16 m/s. 
D) 1.6 m/s. 
E) 16 m/s. 
A) 0.040 m/s. 
B) 0.0050 m/s. 
C) 0.16 m/s. 
D) 1.6 m/s. 
E) 16 m/s.

Exam 9: Fluids and Solids

In addition to its weight,what force is needed to lift a wire ring of radius 2.0 cm from the surface of blood plasma? The surface tension of blood plasma is 7.3 × 10¯2 N/m.

A ping-pong ball has an average density of 0.0840 g/cm3 and a diameter of 3.80 cm.What force would be required to keep the ball completely submerged under water?

A uniform pressure of 5.7 × 105 N/m2 is applied to all six sides of a copper cube.What is the percentage change in volume of the cube? (for copper,B = 14 × 1010 N/m2)

The bulk modulus of a material,as a meaningful physical property,is applicable to which of the following?

The SI units for viscosity are N·s/m2.Another commonly used unit for viscosity is the poise,where 10 poise = 1 N·s/m2.The poise is a fairly large unit,and it is more common to use the centipoise.Which of the following is equal to the centipoise?

​A water pipe with inner radius r1 is connected to a junction with two equal-diameter pipes.Water flows through each of the two pipes with a speed of v.If the diameter of each of the two pipes is ¼ the diameter of the single pipe,what is the flow rate in the single pipe?

Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10−3 N⋅s/m3).The water is 9.0 cm deep and is allowed to stand for 25 minutes.What is the greatest terminal velocity of the particles still in suspension at that time?​

As ice floats in water,about 10% of the ice floats above the surface of the water.If we float some ice in a glass of water,what will happen to the water level as the ice melts?

An ideal fluid,of density 850 kg/m3,flows at 0.560 kg/s through a pipe of radius 0.0250 m.What is the fluid speed?

A container is filled with water and the pressure at the bottom of the container is P.Then the container is emptied halfway and topped off with oil of density 0.8 × 103 kg/m3,which floats on top of the water.What is the pressure at the bottom of the container now?

A fluid has a density of 1 040 kg/m3.If it rises to a height of 1.60 cm in a 1.50-mm diameter capillary tube,what is the surface tension of the liquid? Assume a contact angle of zero.

An ideal fluid,of density 900 kg/m3,flows at 4.80 m/s through a level pipe with radius of 0.22 cm.The pressure in the fluid is 1.3 × 105 N/m2.This pipe connects to a second level pipe,with radius of 0.72 cm.Find the speed of flow in the second pipe.

A blimp is filled with 440 m3 of helium.How big a payload can the balloon lift? (The density of air is 1.29 kg/m3;the density of helium is 0.178 kg/m3. )

A heavily loaded boat is floating in a pond.The boat sinks because of a leak.What happens to the surface level of the pond?

A solid object is made of two materials,one material having density of 2 500 kg/m3 and the other having density of 6 000 kg/m3.If the object contains equal volumes of the materials,what is its average density?

A container is filled with water and the pressure at the container bottom is P.If the container is instead filled with oil having specific gravity 0.80,what new bottom pressure results?

The equation of continuity applied to an incompressible ideal fluid flowing through a pipe of varying diameter is based on what of the following being conserved for the fluid in the pipe?

The condition for onset of turbulent flow is that the Reynolds Number reaches what value?

Bar One has a Young's modulus that is bigger than that of Bar Two.This indicates Bar One

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0080 m3/s.The average fluid speed in the pipe is

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In addition to its weight,what force is needed to lift a wire ring of radius 2.0 cm from the surface of blood plasma? The surface tension of blood plasma is 7.3 × 10¯²N/m.

A ping-pong ball has an average density of 0.0840 g/cm³ and a diameter of 3.80 cm.What force would be required to keep the ball completely submerged under water?

A uniform pressure of 5.7 × 10⁵ N/m² is applied to all six sides of a copper cube.What is the percentage change in volume of the cube? (for copper,B = 14 × 10¹⁰ N/m²)

The SI units for viscosity are N·s/m².Another commonly used unit for viscosity is the poise,where 10 poise = 1 N·s/m².The poise is a fairly large unit,and it is more common to use the centipoise.Which of the following is equal to the centipoise?

A water pipe with inner radius r₁ is connected to a junction with two equal-diameter pipes.Water flows through each of the two pipes with a speed of v.If the diameter of each of the two pipes is ¼ the diameter of the single pipe,what is the flow rate in the single pipe?

Spherical particles of density 2.0 g/cm³ are shaken in a container of water (viscosity = 1.0 × 10−³ N⋅s/m³).The water is 9.0 cm deep and is allowed to stand for 25 minutes.What is the greatest terminal velocity of the particles still in suspension at that time?

An ideal fluid,of density 850 kg/m³,flows at 0.560 kg/s through a pipe of radius 0.0250 m.What is the fluid speed?

A container is filled with water and the pressure at the bottom of the container is P.Then the container is emptied halfway and topped off with oil of density 0.8 × 10³ kg/m³,which floats on top of the water.What is the pressure at the bottom of the container now?

A fluid has a density of 1 040 kg/m³.If it rises to a height of 1.60 cm in a 1.50-mm diameter capillary tube,what is the surface tension of the liquid? Assume a contact angle of zero.

An ideal fluid,of density 900 kg/m³,flows at 4.80 m/s through a level pipe with radius of 0.22 cm.The pressure in the fluid is 1.3 × 10⁵ N/m².This pipe connects to a second level pipe,with radius of 0.72 cm.Find the speed of flow in the second pipe.

A blimp is filled with 440 m³ of helium.How big a payload can the balloon lift? (The density of air is 1.29 kg/m³;the density of helium is 0.178 kg/m³. )

A solid object is made of two materials,one material having density of 2 500 kg/m³ and the other having density of 6 000 kg/m³.If the object contains equal volumes of the materials,what is its average density?

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0080 m³/s.The average fluid speed in the pipe is