Question 1

A loaded ship passes from a lake (fresh water)to the ocean (salt water).Salt water is denser than fresh water and as a result the ship will:

Accepted Answer

A) ride higher in the water 
B) settle lower in the water 
C) ride at the same level in the water 
D) experience an increase in buoyant force 
E) experience a decrease in buoyant force 
A) ride higher in the water 
B) settle lower in the water 
C) ride at the same level in the water 
D) experience an increase in buoyant force 
E) experience a decrease in buoyant force

Question 2

1.1$\rho$0 Rank these fluids according to the volume displaced by the object, least to greatest.

Accepted Answer

A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 3, 1, 2 
E) All are the same 
A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 3, 1, 2 
E) All are the same

Question 3

An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.Which of the following is true?

Accepted Answer

A) The actual weight of the object is 20 N. 
B) The actual weight of the object is 10 N. 
C) The actual weight of the object is slightly more than 30 N, due to the buoyant force of the air. 
D) The actual weight of the object is slightly less than 30 N, due to the buoyant force of the air. 
E) The actual weight of the object is equal to the apparent weight of the object in both cases. 
A) The actual weight of the object is 20 N. 
B) The actual weight of the object is 10 N. 
C) The actual weight of the object is slightly more than 30 N, due to the buoyant force of the air. 
D) The actual weight of the object is slightly less than 30 N, due to the buoyant force of the air. 
E) The actual weight of the object is equal to the apparent weight of the object in both cases.

Question 4

The hydraulic automobile jack illustrates:

Accepted Answer

A) Archimedes' principle 
B) Pascal's principle 
C) Hooke's law 
D) Newton's third law 
E) Newton's second law 
A) Archimedes' principle 
B) Pascal's principle 
C) Hooke's law 
D) Newton's third law 
E) Newton's second law

Question 5

Two identical blocks of ice float in water as shown.Then:

Accepted Answer

A) block A displaces a greater volume of water since the pressure acts on a smaller bottom area 
B) block B displaces a greater volume of water since the pressure is less on its bottom 
C) the two blocks displace equal volumes of water since they have the same weight 
D) block A displaces a greater volume of water since its submerged end is lower in the water 
E) block B displaces a greater volume of water since its submerged end has a greater area 
A) block A displaces a greater volume of water since the pressure acts on a smaller bottom area 
B) block B displaces a greater volume of water since the pressure is less on its bottom 
C) the two blocks displace equal volumes of water since they have the same weight 
D) block A displaces a greater volume of water since its submerged end is lower in the water 
E) block B displaces a greater volume of water since its submerged end has a greater area

Question 6

A non-viscous incompressible fluid is pumped steadily into the narrow end of a long tapered pipe and emerges from the wide end.The pressure at the input is greater than at the output.A possible explanation is:

Accepted Answer

A) the fluid speed increases from input to output 
B) the fluid speed is the same at the two ends 
C) the fluid is flowing uphill 
D) the fluid is flowing downhill 
E) the fluid is flowing horizontally 
A) the fluid speed increases from input to output 
B) the fluid speed is the same at the two ends 
C) the fluid is flowing uphill 
D) the fluid is flowing downhill 
E) the fluid is flowing horizontally

Question 7

A fluid is undergoing steady flow.Therefore:

Accepted Answer

A) the velocity of any given molecule of fluid does not change 
B) the pressure does not vary from point to point 
C) the velocity at any given point does not vary with time 
D) the density does not vary from point to point 
E) the flow is not uphill or downhill 
A) the velocity of any given molecule of fluid does not change 
B) the pressure does not vary from point to point 
C) the velocity at any given point does not vary with time 
D) the density does not vary from point to point 
E) the flow is not uphill or downhill

Question 8

Gases may be distinguished from other forms of matter by their:

Accepted Answer

A) lack of color 
B) small atomic weights 
C) inability to form free surfaces 
D) ability to flow 
E) ability to exert a buoyant force 
A) lack of color 
B) small atomic weights 
C) inability to form free surfaces 
D) ability to flow 
E) ability to exert a buoyant force

Question 9

Several cans of different sizes and shapes are all filled with the same liquid to the same depth.Then:

Accepted Answer

A) the weight of the liquid is the same for all cans 
B) the force of the liquid on the bottom of each can is the same 
C) the least pressure is at the bottom of the can with the largest bottom area 
D) the greatest pressure is at the bottom of the can with the largest bottom area 
E) the pressure on the bottom of each can is the same 
A) the weight of the liquid is the same for all cans 
B) the force of the liquid on the bottom of each can is the same 
C) the least pressure is at the bottom of the can with the largest bottom area 
D) the greatest pressure is at the bottom of the can with the largest bottom area 
E) the pressure on the bottom of each can is the same

Question 10

Two balls have the same shape and size but one is denser than the other.When they are dropped in air, which has the greater acceleration? Do not ignore air resistance.

Accepted Answer

A) The heavier ball 
B) The lighter ball 
C) They have the same acceleration 
D) The heavier ball if atmospheric pressure is high, they lighter ball if it is low 
E) The lighter ball if atmospheric pressure is high, the heavier ball if it is low 
A) The heavier ball 
B) The lighter ball 
C) They have the same acceleration 
D) The heavier ball if atmospheric pressure is high, they lighter ball if it is low 
E) The lighter ball if atmospheric pressure is high, the heavier ball if it is low

Question 11

Water (density = 1.0* 103 kg/m3)flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?

Accepted Answer

A) cannot be calculated without knowing the pressure 
B) 120 J/m3 
C) 7.2 x 103 J/m3 
D) 9.5 x 103 J/m3 
E) 9.3 x 104 J/m3 
A) cannot be calculated without knowing the pressure 
B) 120 J/m3 
C) 7.2 x 103 J/m3 
D) 9.5 x 103 J/m3 
E) 9.3 x 104 J/m3

Question 12

Which of the following assumptions is NOT made in the derivation of Bernoulli's equation?

Accepted Answer

A) assume streamline flow 
B) neglect viscosity 
C) neglect friction 
D) neglect gravity 
E) neglect turbulence 
A) assume streamline flow 
B) neglect viscosity 
C) neglect friction 
D) neglect gravity 
E) neglect turbulence

Question 13

The pressure exerted on the ground by a man is greatest when:

Accepted Answer

A) he stands with both feet flat on the ground 
B) he stands flat on one foot 
C) he stands on the toes of one foot 
D) he lies down on the ground 
E) all of the above yield the same pressure 
A) he stands with both feet flat on the ground 
B) he stands flat on one foot 
C) he stands on the toes of one foot 
D) he lies down on the ground 
E) all of the above yield the same pressure

Question 14

A water line enters a house 2.0 m below ground.A smaller diameter pipe carries water to a faucet 5.0 m above ground, on the second floor.Water flows at 2.0 m/s in the main line and at 7.0 m/s on the second floor.Take the density of water to be 1.0 *103 kg/m3.The pressure in the main line is 2.0*105 Pa; then the difference in pressure between the main line and the second floor is:

Accepted Answer

A) 6.9 * 104 Pa with the main line at the higher pressure 
B) 2.3 * 104 Pa with the main line at the higher pressure 
C) 6.9 *104 Pa with the main line at the lower pressure 
D) 2.3 *104 Pa with the main line at the lower pressure 
E) 9.1 *104 Pa with the main line at the higher pressure 
A) 6.9 * 104 Pa with the main line at the higher pressure 
B) 2.3 * 104 Pa with the main line at the higher pressure 
C) 6.9 *104 Pa with the main line at the lower pressure 
D) 2.3 *104 Pa with the main line at the lower pressure 
E) 9.1 *104 Pa with the main line at the higher pressure

Question 15

A block of wood weighs 160 N and has a specific gravity of 0.60.To sink it in fresh water requires an additional downward force of:

Accepted Answer

A) 54 N 
B) 64 N 
C) 96 N 
D) 110 N 
E) 240 N 
A) 54 N 
B) 64 N 
C) 96 N 
D) 110 N 
E) 240 N

Question 16

A student standardizes the concentration of a salt-water solution by slowly adding salt until an egg will just float.The procedure is based on the assumption that:

Accepted Answer

A) all eggs have the same volume 
B) all eggs have the same weight 
C) all eggs have the same density 
D) all eggs have the same shape 
E) the salt tends to neutralize the cholesterol in the egg 
A) all eggs have the same volume 
B) all eggs have the same weight 
C) all eggs have the same density 
D) all eggs have the same shape 
E) the salt tends to neutralize the cholesterol in the egg

Question 17

An object floats on the surface of a fluid.For purposes of calculating the torque on it, the buoyant force is taken to act at:

Accepted Answer

A) the center of the bottom surface of the object 
B) the center of gravity of the object 
C) the center of gravity of the fluid that the object replaced 
D) the geometric center of the object 
E) none of the above 
A) the center of the bottom surface of the object 
B) the center of gravity of the object 
C) the center of gravity of the fluid that the object replaced 
D) the geometric center of the object 
E) none of the above

Question 18

A fluid is undergoing "incompressible" flow.This means that:

Accepted Answer

A) the pressure at a given point cannot change with time 
B) the velocity at a given point cannot change with time 
C) the velocity must be the same everywhere 
D) the pressure must be the same everywhere 
E) the density cannot change with time or location 
A) the pressure at a given point cannot change with time 
B) the velocity at a given point cannot change with time 
C) the velocity must be the same everywhere 
D) the pressure must be the same everywhere 
E) the density cannot change with time or location

Question 19

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 * 103 kg/m3)streams steadily out at 7.0 m/s.The rate at which mass is leaving the pipe is:

Accepted Answer

A) 2.5 kg/s 
B) 4.9 kg/s 
C) 7.0 kg/s 
D) 48 kg/s 
E) 7.0 * 103 kg/s 
A) 2.5 kg/s 
B) 4.9 kg/s 
C) 7.0 kg/s 
D) 48 kg/s 
E) 7.0 * 103 kg/s

Question 20

A pirate chest rests at the bottom of an ocean.If the water is still, the net force it exerts on the chest:

Accepted Answer

A) is upward 
B) is downward 
C) is zero 
D) depends on the mass of the chest 
E) depends on the contents of the chest 
A) is upward 
B) is downward 
C) is zero 
D) depends on the mass of the chest 
E) depends on the contents of the chest

Exam 14: Fluids

A loaded ship passes from a lake (fresh water)to the ocean (salt water).Salt water is denser than fresh water and as a result the ship will:

1.1 ρ\rhoρ 0 Rank these fluids according to the volume displaced by the object, least to greatest.

An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.Which of the following is true?

The hydraulic automobile jack illustrates:

Two identical blocks of ice float in water as shown.Then:

A non-viscous incompressible fluid is pumped steadily into the narrow end of a long tapered pipe and emerges from the wide end.The pressure at the input is greater than at the output.A possible explanation is:

A fluid is undergoing steady flow.Therefore:

Gases may be distinguished from other forms of matter by their:

Several cans of different sizes and shapes are all filled with the same liquid to the same depth.Then:

Two balls have the same shape and size but one is denser than the other.When they are dropped in air, which has the greater acceleration? Do not ignore air resistance.

Water (density = 1.0* 103 kg/m3)flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?

Which of the following assumptions is NOT made in the derivation of Bernoulli's equation?

The pressure exerted on the ground by a man is greatest when:

A block of wood weighs 160 N and has a specific gravity of 0.60.To sink it in fresh water requires an additional downward force of:

A student standardizes the concentration of a salt-water solution by slowly adding salt until an egg will just float.The procedure is based on the assumption that:

An object floats on the surface of a fluid.For purposes of calculating the torque on it, the buoyant force is taken to act at:

A fluid is undergoing "incompressible" flow.This means that:

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 * 103 kg/m3)streams steadily out at 7.0 m/s.The rate at which mass is leaving the pipe is:

A pirate chest rests at the bottom of an ocean.If the water is still, the net force it exerts on the chest:

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Filters

1.1 $\rho$ ₀ Rank these fluids according to the volume displaced by the object, least to greatest.

Water (density = 1.0* 10³ kg/m³)flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 * 10³ kg/m³)streams steadily out at 7.0 m/s.The rate at which mass is leaving the pipe is: