Section 13.3
Fluids at Rest and in Motion
Practice Test
1.
To rise in water, a fish uses its air bladder to __________.
a.
displace less water
b.
increase air pressure
c.
increase water pressure
d.
displace more water
Hint
2.
If you wanted to use a setup like the one in Figure 13-11 to create an upward force triple that of the downward force you exert, which of the following combination of piston radii could accomplish this?
a.
r
1
, 0.333 m;
r
2
, 1 m
b.
r
1
, 0.577 m;
r
2
, 1 m
c.
r
1
, 1.73 m;
r
2
, 1 m
d.
r
1
, 3 m;
r
2
, 1 m
Hint
3.
Based on the information given with Figure 13-12, what is the maximum pressure Alvin can withstand? Use 1030 kg/m
3
for the density of seawater.
a.
4.41×10
7
Pa
b.
1.06×10
8
Pa
c.
4.54×10
7
Pa
d.
1.03×10
8
Pa
Hint
4.
__________ states that any change in pressure applied to any point on a confined fluid is transmitted undiminished throughout the fluid.
a.
Dalton's law
b.
Galileo's law
c.
Pascal's principle
d.
Boyle's law
Hint
5.
Why does ice float?
a.
It has a lower density than water.
b.
It has a higher density than water.
c.
It is an amorphous solid.
d.
It has strong cohesive properties.
Hint
6.
Based on the information given with Figure 13-12, what is the pressure at the bottom of the Marianas trench? Use 1030 kg/m
3
for the density of seawater.
a.
4.41×10
7
Pa
b.
4.54×10
7
Pa
c.
1.03×10
8
Pa
d.
1.06×10
8
Pa
Hint
7.
The buoyant force is in which direction?
a.
downward
b.
toward higher pressures
c.
circular
d.
upward
Hint
8.
If you wanted to use a setup like the one in Figure 13-11 to create an upward force triple that of the downward force you exert, which of the following combination of piston areas could accomplish this?
a.
A
1
, 6 m
2
;
A
2
,10 m
2
b.
A
1
, 6 m
2
;
A
2
, 2 m
2
c.
A
1
, 6 m
2
;
A
2
, 18 m
2
d.
A
1
, 6 m
2
;
A
2
, 8 m
2
Hint
9.
Which of the following does pressure in water not depend on?
a.
shape
b.
depth
c.
gravity
d.
density
Hint
10.
According to Archimedes' principle, an object immersed in fluid has an upward force on it equal to __________.
a.
the weight of the object
b.
the weight of all the fluid in the container
c.
the weight of the fluid displaced minus the weight of the object
d.
the weight of the fluid displaced
Hint
11.
Which is an example of Pascal's principle?
a.
a straw
b.
hydraulic brakes
c.
hydroplaning wheels
d.
a siphon
Hint
12.
In Figure 13-14a, if the chunk of steel were cut in half and one of the pieces were placed in the same liquid, how would it behave?
a.
There is insufficient information to answer the question.
b.
It would float mostly submerged.
c.
It would sink to the bottom of the container.
d.
It would float almost entirely above the surface.
Hint
13.
What type of buoyancy results in a feeling of weightlessness?
a.
negative
b.
neutral
c.
positive
d.
changing
Hint
