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 A

Question 2

A non-viscous incompressible liquid is flowing through a horizontal pipe of constant cross-section. Bernoulli's equation and the equation of continuity predict that the drop in pressure along the pipe:

Accepted Answer

A)  is zero 
B)  depends on the length of the pipe 
C)  depends on the fluid velocity 
D)  depends on the cross-sectional area of the pipe 
E)  depends on the height of the pipe 
A)  is zero 
B)  depends on the length of the pipe 
C)  depends on the fluid velocity 
D)  depends on the cross-sectional area of the pipe 
E)  depends on the height of the pipe A

Question 3

A bucket of water is pushed from left to right with increasing speed across a horizontal surface. Consider the pressure at two points at the same level in the water.

Accepted Answer

A)  It is the same 
B)  It is higher at the point on the left 
C)  It is higher at the point on the right 
D)  At first it is higher at the point on the left but as the bucket speeds up it is lower there 
E)  At first it is higher at the point on the right but as the bucket speeds up it is lower there 
A)  It is the same 
B)  It is higher at the point on the left 
C)  It is higher at the point on the right 
D)  At first it is higher at the point on the left but as the bucket speeds up it is lower there 
E)  At first it is higher at the point on the right but as the bucket speeds up it is lower there B

Question 4

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 5

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

Question 6

A non-viscous incompressible fluid is pumped steadily up a vertical pipe with uniform cross section. The difference in pressure between points at the top and bottom:

Accepted Answer

A)  is the same as it would be if the fluid were motionless 
B)  is greater at higher flow rates than at lower flow rates 
C)  is less at higher flow rates than at lower flow rates 
D)  does not depend on the density of the fluid 
E)  is zero 
A)  is the same as it would be if the fluid were motionless 
B)  is greater at higher flow rates than at lower flow rates 
C)  is less at higher flow rates than at lower flow rates 
D)  does not depend on the density of the fluid 
E)  is zero

Question 7

Water flows through a constriction in a horizontal pipe. As it enters the constriction, the water's:

Accepted Answer

A)  speed increases and pressure decreases 
B)  speed increases and pressure remains constant 
C)  speed increases and pressure increases 
D)  speed decreases and pressure increases 
E)  speed decreases and pressure decreases 
A)  speed increases and pressure decreases 
B)  speed increases and pressure remains constant 
C)  speed increases and pressure increases 
D)  speed decreases and pressure increases 
E)  speed decreases and pressure decreases

Question 8

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

Accepted Answer

A)  it is independent of the surface area 
B)  it is the same for all points on that surface 
C)  it would not increase if the liquid depth were increased 
D)  it would increase if the liquid density were increased 
E)  it would increase if the atmospheric pressure increased 
A)  it is independent of the surface area 
B)  it is the same for all points on that surface 
C)  it would not increase if the liquid depth were increased 
D)  it would increase if the liquid density were increased 
E)  it would increase if the atmospheric pressure increased

Question 9

The density of water is 1.0 g/cm3. If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

Accepted Answer

A)  0.20 g/cm3 
B)  0.90 g/cm3 
C)  1.0 g/cm3 
D)  1.3 g/cm3 
E)  5.0 g/cm3 
A)  0.20 g/cm3 
B)  0.90 g/cm3 
C)  1.0 g/cm3 
D)  1.3 g/cm3 
E)  5.0 g/cm3

Question 10

A long U-tube contains mercury (density = 14 * 103 kg/m3). When 10 cm of water (density = 1.0 *103 kg/m 3) is poured into the left arm, the mercury in the right arm rises above its original level by:

Accepted Answer

A)  0.36 cm 
B)  0.72 cm 
C)  14 cm 
D)  35 cm 
E)  70 cm 
A)  0.36 cm 
B)  0.72 cm 
C)  14 cm 
D)  35 cm 
E)  70 cm

Question 11

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 12

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 13

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

Accepted Answer

A)  pressure is the same at all levels in a fluid 
B)  increases of pressure are transmitted equally to all parts of a fluid 
C)  the pressure at a point in a fluid is due to the weight of the fluid above it 
D)  increases of pressure can only be transmitted through fluids 
E)  the pressure at a given depth is proportional to the depth in the fluid 
A)  pressure is the same at all levels in a fluid 
B)  increases of pressure are transmitted equally to all parts of a fluid 
C)  the pressure at a point in a fluid is due to the weight of the fluid above it 
D)  increases of pressure can only be transmitted through fluids 
E)  the pressure at a given depth is proportional to the depth in the fluid

Question 14

In a stationary homogeneous liquid:

Accepted Answer

A)  pressure is the same at all points 
B)  pressure depends on the direction 
C)  pressure is independent of any atmospheric pressure on the upper surface of the liquid 
D)  pressure is the same at all points at the same level 
E)  none of the above 
A)  pressure is the same at all points 
B)  pressure depends on the direction 
C)  pressure is independent of any atmospheric pressure on the upper surface of the liquid 
D)  pressure is the same at all points at the same level 
E)  none of the above

Question 15

A wood board floats in fresh water with 60% of its volume under water. The density of the wood is:

Accepted Answer

A)  0.4 g/cm3 
B)  0.5 g/cm3 
C)  0.6 g/cm3 
D)  less than 0.4 g/cm3 
E)  more than 0.6 g/cm3 
A)  0.4 g/cm3 
B)  0.5 g/cm3 
C)  0.6 g/cm3 
D)  less than 0.4 g/cm3 
E)  more than 0.6 g/cm3

Question 16

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 17

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm3/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

Accepted Answer

A)  $\downarrow$ and 3 cm3/s 
B)  $\uparrow$and 7 cm3/s 
C)  $\downarrow$ and 9 cm3/s 
D)  $\uparrow$ and 11 cm3/s 
E)  $\downarrow$and 15 cm3/s 
A)  $\downarrow$ and 3 cm3/s 
B)  $\uparrow$and 7 cm3/s 
C)  $\downarrow$ and 9 cm3/s 
D)  $\uparrow$ and 11 cm3/s 
E)  $\downarrow$and 15 cm3/s

Question 18

1 Pa is:

Accepted Answer

A)  1 N/m 
B)  1 m/N 
C)  1 kg/m.s 
D)  1 kg/m.s2 
E)  1 N/m.s 
A)  1 N/m 
B)  1 m/N 
C)  1 kg/m.s 
D)  1 kg/m.s2 
E)  1 N/m.s

Question 19

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m3). The volume of the rock is:

Accepted Answer

A)  0.14 m3 
B)  0.50 m3 
C)  0.90 m3 
D)  5.1 *10-2 m3 
E)  9.2 *10-2 m3 
A)  0.14 m3 
B)  0.50 m3 
C)  0.90 m3 
D)  5.1 *10-2 m3 
E)  9.2 *10-2 m3

Question 20

A bucket resting on the floor of an elevator contains an incompressible fluid of density $\rho$. When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance $\Delta$h, is given by:

Accepted Answer

A)  $\rho$a$\Delta$h 
B)  $\rho$g$\Delta$h 
C)  $\rho$(g + a)$\Delta$h 
D)  $\rho$(g - a)$\Delta$h 
E)  $\rho$ga$\Delta$h 
A)  $\rho$a$\Delta$h 
B)  $\rho$g$\Delta$h 
C)  $\rho$(g + a)$\Delta$h 
D)  $\rho$(g - a)$\Delta$h 
E)  $\rho$ga$\Delta$h

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:

A non-viscous incompressible liquid is flowing through a horizontal pipe of constant cross-section. Bernoulli's equation and the equation of continuity predict that the drop in pressure along the pipe:

A bucket of water is pushed from left to right with increasing speed across a horizontal surface. Consider the pressure at two points at the same level in the water.

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:

A non-viscous incompressible fluid is pumped steadily up a vertical pipe with uniform cross section. The difference in pressure between points at the top and bottom:

Water flows through a constriction in a horizontal pipe. As it enters the constriction, the water's:

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

The density of water is 1.0 g/cm3. If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

A long U-tube contains mercury (density = 14 * 103 kg/m3). When 10 cm of water (density = 1.0 *103 kg/m 3) is poured into the left arm, the mercury in the right arm rises above its original level by:

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:

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:

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

In a stationary homogeneous liquid:

A wood board floats in fresh water with 60% of its volume under water. The density of the wood is:

A fluid is undergoing steady flow. Therefore:

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm3/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

1 Pa is:

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m3). The volume of the rock is:

A bucket resting on the floor of an elevator contains an incompressible fluid of density ρ\rhoρ . When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance Δ\DeltaΔ h, is given by:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

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:

The density of water is 1.0 g/cm³. If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

A long U-tube contains mercury (density = 14 * 10³ kg/m³). When 10 cm of water (density = 1.0 *10³ kg/m ³) is poured into the left arm, the mercury in the right arm rises above its original level by:

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm³/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m³). The volume of the rock is:

A bucket resting on the floor of an elevator contains an incompressible fluid of density $\rho$ . When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance $\Delta$ h, is given by: