Physics 011
MC#10
Chapter 10: Fluids
1 
Brass has a density of 8.9 g/cm^{3}. A sample of brass is shaped into a perfect cube that has a mass of 71.2 grams. What is the length of each side of the cube? 

2.0
cm 

4.0
cm 

8.0
cm 

9.0
cm 


2 
What is the specific gravity of a bar of iron that has a mass of 192 grams and the dimensions 12 cm x 2 cm x 1 cm? 

8.0
g/cm^{3} 

8.0 

24
g/cm^{3} 

24 


3 
A diver is swimming 10 meters below the surface of the water in a reservoir. There is no current, the air has a pressure of 1 atmosphere, and the density of the water is 1000 kilograms per cubic meter. What is the pressure experienced by the diver? 

1.1
atm 

1.99
x 10^{5} Pa 

11
atm 

1.01
x 10^{5} Pa 


4 
A closedend tube is evacuated and placed with its open end beneath the surface of a reservoir of mercury. The mercury rises to a height of 93 cm. If the density of mercury is 1.36 x 10^{4} kg/m^{3}, what is the pressure at the bottom of the column of mercury? 

1.24
x 10^{5} Pa 

1.24
x 10^{5} atm 

1.26
x 10^{4} Pa 

1.26
x 10^{4} atm 


5 
Two rectangular water tanks are filled to the same depth with water. Tank A has a bottom surface area of 2 m^{2} and tank B has a bottom area of 4 m^{2}. Which statement about the forces and pressures at the bottom of the tanks is correct? 

Since
F_{A} is less than F_{B}, then, P_{A}
is less than P_{B}. 

Since
F_{A} is equal to F_{B}, then, P_{A}
is less than P_{B}. 

Since
F_{A} is less than F_{B}, then, P_{A}
is equal to P_{B}. 

Since
F_{A} is equal to F_{B}, then, P_{A}
is equal to P_{B}. 


6 
The bottom of each foot of an 80kg man has an area of about 400 cm^{2}. What is the effect of his wearing snowshoes with an area of about 0.400 m^{2}? 

The
pressure exerted on the snow becomes 10 times as great. 

The
pressure exerted on the snow becomes 1/10 as great. 

The
pressure exerted on the snow remains the same. 

The
force exerted on the snow is 1/10 as great. 


7 
In a hydraulic lift the surface of the input piston is 10 cm^{2} and that of the output piston is 3000 cm^{2}. What is the work done if a 100 N force applied to the input piston raises the output piston by 2.0 meters? 

20
kJ 

30
kJ 

40
kJ 

60
KJ 


8 
The pressure in a liquid is measured as a function of depth
in the liquid for four different liquids. The results are plotted in the
figure at the right. If the pressure at a certain
depth h_{o} in the liquid represented by the graph labeled B is P_{o},
the pressure at the same depth in the liquid represented by the graph labeled
C would be ___ P_{o}. 

equal
to 

less
than 

more
than 

incomparable
with 


9 
The pressure in a liquid is measured as a function of depth
in the liquid for four different liquids. The results are plotted in the
figure at the right. The liquid with the
smallest mass density is represented by the graph labeled ___. 

A 

B 

C 

D 


10 
The pressure in a liquid is measured as a function of depth
in the liquid for four different liquids. The results are plotted in the
figure at the right. A certain object just
barely floats when dropped into a beaker filled with liquid B. If the same
object was dropped into a beaker filled with liquid D, the object ___. 

would
definitely float 

would
definitely sink 

might
sink or it might float. There's no way to tell without additional
information. 


11 
The pressure in a liquid is measured as a function of depth
in the liquid for four different liquids. The results are plotted in the
figure at the right. The pressure at a depth h_{o}
in the liquid represented by the graph labeled B is P_{o}. The depth
in the liquid represented by the graph labeled A at which the pressure will
have the same value P_{o}, is ___ h_{o}. 

equal
to 

less
than 

more
than 

incomparable
with 


12 
The pressure in a liquid is measured as a function of depth
in the liquid for four different liquids. The results are plotted in the
figure at the right. The mass density of the
liquid represented by the graph labeled C is ___ the mass density of the
liquid represented by the graph labeled D. 

less
than 

equal
to 

more
than 

incomparable
with 


13 
The pressure in a liquid is measured as a function of depth
in the liquid for four different liquids. The results are plotted in the
figure at the right. A certain object just
barely floats in a beaker filled with liquid B. If the same object was placed
in a beaker filled with liquid A, the object ___. 

would
definitely float 

would
definitely sink 

might
sink or it might float. There's no way to tell without additional
information. 


14 
One pound solid pieces of pine wood, lead and
aluminum are dropped over the side of a boat in the middle of a deep fresh
water lake. The board floats and the two solid pieces of metal sink. The buoyant force acting
on the pine board is ___ the buoyant force acting on the aluminum block. 

equal
to 

more
than 

less
than 

incomparable
with 


15 
One pound solid pieces of pine wood, lead and
aluminum are dropped over the side of a boat in the middle of a deep fresh
water lake. The board floats and the two solid pieces of metal sink. The buoyant force acting
on the lead block is ___ the buoyant force acting on the aluminum block. 

equal
to 

more
than 

less
than 

incomparable
with 


16 
One pound solid pieces of pine wood, lead and
aluminum are dropped over the side of a boat in the middle of a deep fresh
water lake. The board floats and the two solid pieces of metal sink. As the lead block falls
toward the bottom of the lake the buoyant force acting on it ___. 

remains
constant 

decreases 

increases 

is
unpredictable 


17 
A balloon is partially inflated with air, tied to
a rock and thrown over the side of the boat into a deep fresh water lake. The
rock and balloon sink toward the bottom. As the rock and balloon
sink toward the bottom, the magnitude of the buoyant force acting on the
balloon ___. 

decreases 

increases 

remains
constant 

is
impossible to predict 


18 
A balloon is partially inflated with air, tied to
a rock and thrown over the side of the boat into a deep fresh water lake. The
rock and balloon sink toward the bottom. As the rock and balloon
sink toward the bottom, the magnitude of the buoyant force acting on the rock
___. 

remains
constant 

decreases 

increases 

is
impossible to predict 


19 
A balloon is partially inflated with air, tied to
a rock and thrown over the side of the boat into a deep fresh water lake. The
rock and balloon sink toward the bottom. As the rock and balloon
sink toward the bottom, the speed of the rock ___. 

increases 

remains
constant 

decreases 

is
impossible to predict 


20 
Two insoluble bodies, A and B, appear to lose the same amount of weight when submerged in alcohol. Which statement is most applicable? 

Both
bodies have the same mass in air. 

Both
bodies have the same volume. 

Both
bodies have the same density. 

Both
bodies have the same weight in air. 


21 
At 20^{o}C the density of water is 1 g/cm^{3}. What is the density of a body that has a mass of 100 grams in air and an apparent weight of 25 gram weights when suspended in water? 

0.25
g/cm^{3} 

0.75
g/cm^{3} 

1.3
g/cm^{3} 

4.0
g/cm^{3} 


22 
The aorta of a 70 kilogram man has a crosssectional area of 3.0 square centimeters and carries blood with a velocity of 30 centimeters per second. What is the average volume flow rate? 

10
cm/s 

33
cm^{3}/s 

10
cm^{2}/s 

90
cm^{3}/s 


23 
Consider the laminar flow of an incompressible, non viscous
liquid through the plumbing in the figure at the right. The speed of the fluid at
point p_{1} is ___ the speed of the fluid at point p_{2}. 

less
than 

more
than 

equal
to 

incomparable
with 


24 
Consider the laminar flow of an incompressible, non viscous
liquid through the plumbing in the figure at the right. The volume of the fluid
that flows past point p_{2} in two seconds is ___ the volume of the
fluid that flows past point p_{5} in two seconds. 

equal
to 

less
than 

more
than 

incomparable
with 


25 
Consider the laminar flow of an incompressible, non viscous
liquid through the plumbing in the figure at the right. The kinetic energy per
unit volume of the liquid at point p_{1} is ___ the kinetic energy
per unit volume of the fluid at point p_{4}. 

more
than 

equal
to 

less
than 

incomparable
with 


26 
Consider the laminar flow of an incompressible, non viscous
liquid through the plumbing in the figure at the right. The density of the fluid
at point p_{3} is ___ what it is at point p_{5}. 

equal
to 

less
than 

more
than 

incomparable
with 


27 
Consider the laminar flow of an incompressible, non viscous
liquid through the plumbing in the figure at the right. The pressure in the fluid
at point p_{1} is ___ the pressure at point p_{3}. 

more
than 

equal
to 

less
than 

incomparable
with 


28 
A small diameter copper rod is bent in the shape of a V. A
straight piece of the same material of length L_{o} is laid across
the V forming a triangle. The device is dipped into a liquid which has surface
tension y_{o}, forming a film of the material within the triangle.
The V is then hung upside down as in the figure at the right and the straight
rod moves down slightly coming to equilibrium in a horizontal position a
distance d_{o} below the apex of the V. If the overall length of
the moveable rod had been a little longer, its equilibrium position below the
apex of the V would have been ___ d_{o}. 

equal
to 

less
than 

more
than 

incomparable
with 


29 
A small diameter copper rod is bent in the shape of a V. A
straight piece of the same material of length L_{o} is laid across
the V forming a triangle. The device is dipped into a liquid which has
surface tension y_{o}, forming a film of the material within the
triangle. The V is then hung upside down as in the figure at the right and
the straight rod moves down slightly coming to equilibrium in a horizontal
position a distance d_{o} below the apex of the V. If the surface tension of
the liquid had been more than y_{o}, when the movable rod came to
equilibrium, its position below the apex of the V would have been ___ d_{o}.


equal
to 

less
than 

more
than 

incomparable
with 