Download - Force per unit area
Force per unit area
Density
Buoyancy
Pressure
Power
13%
0%
81%
6%
1. Density2. Buoyancy3. Pressure4. Power
Mass per unit volume
Density
Buoyancy
Pressure
Power
95%
0%0%5%
1. Density2. Buoyancy3. Pressure4. Power
Upward force experienced by an object immersed in a fluid.
Density
Buoyancy
Pressure
Power
5% 0%0%
95%1. Density2. Buoyancy3. Pressure4. Power
The buoyant force experienced by an object equals the weight of the fluid it displaces.
Archim
edes’ pr...
Pascal’s
princ..
.
Bernoulli’s L
a...
The ideal g
as ...
100%
0%0%0%
1. Archimedes’ principle2. Pascal’s principle3. Bernoulli’s Law4. The ideal gas law
Changes in pressure are transmitted throughout a fluid.
Archim
edes’ pr...
Pascal’s
princ..
.
Bernoulli’s L
a...
The ideal g
as ...
0%
15%5%
80%1. Archimedes’ principle2. Pascal’s principle3. Bernoulli’s Law4. The ideal gas law
A Pascal is equal to one
Gram/cu
bic cen...
Joule/se
cond
Newton/square ...
Joule/k
ilogram...
5%10%
80%
5%
1. Gram/cubic centimeter
2. Joule/second3. Newton/square
meter4. Joule/kilogram/
Kelvin
The ______ is equal on each cylinder of a hydraulic lift.
Pressure
Force Area
Displac
ement
81%
14%
0%5%
1. Pressure2. Force3. Area4. Displacement
Density equals:
m/V F/
A rV
g
aLoDT
100%
0%0%0%
1. m/V2. F/A3. rVg4. aLoDT
The buoyant force equals the ____ of the displaced fluid
Density
Mass
Volume
Weight
0%
90%
5%5%
1. Density2. Mass3. Volume4. Weight
The average kinetic energy of a particle in random thermal motion describes
Heat
Thermal E
nergy
Mech
anical E
ne...
Temperature
5%
57%
14%
24%
1. Heat2. Thermal Energy3. Mechanical Energy4. Temperature
1.0 L of gas is initially at a temperature of -73oC and a pressure of 80 kPa. If the temperature is raised to 23oC with no change of volume the new pressure will be:
27 kPa
120 kPa
160 kPa
180 kPa
17%11%
28%
44%
1. 27 kPa2. 120 kPa3. 160 kPa4. 180 kPa
If a 24 kg object rests on a surface with an area of 0.08 m2 it exerts a pressure of:
300 Pa
3.0 kPa
0.0033 Pa 55 psi
19%
0%5%
76%1. 300 Pa2. 3.0 kPa3. 0.0033 Pa4. 55 psi
Which formula could be used to solve a problem about hydraulic lifts?
P1V1/T1 = P2V2...
DL=aLDT
P=Po + rhg
F1/A
1=F2/A
2
9%
61%
22%
9%
1. P1V1/T1 = P2V2/T2
2. DL=aLDT3. P=Po + rhg4. F1/A1=F2/A2
Which formula could be used to determine the pressure exerted by a fluid at a certain depth?
FB=rV
g
r=m/V
P=Po+rhg
P=W/t
5% 0%
95%
0%
1. FB=rVg2. r=m/V3. P=Po+rhg4. P=W/t
When heat is added to a substance at its melting point its temperature increases.
True Fa
lse
57%
43%
1. True2. False
The increase in thermal energy needed to raise one unit of mass by one unit of temperature is called:
Heat of v
aporization
Specifi
c Heat
Coefficient o
f linear t
he...
Radiant Heat
16%5%5%
74%1. Heat of vaporization2. Specific Heat3. Coefficient of linear
thermal expansion4. Radiant Heat
The first law of thermodynamics states that:
The inte
rnal
energ
y of..
The bouya
nt force
e...
The entro
py of th
e un...
91%
9%0%
1. The internal energy of a system can be increased by doing work or adding heat.
2. The bouyant force equals the weight of fluid displaced.
3. The entropy of the universe is always increasing.
The relationship between heat energy and temperature change is given by the formula:
Q=m
cDT
DL=aLoD
T
PV=nRT
P=W/t
96%
0%0%4%
1. Q=mcDT2. DL=aLoDT3. PV=nRT4. P=W/t
When a chocolate bar is cut in half its density is…
Halved
Unchan
ged
Doubled
26%
4%
70%1. Halved2. Unchanged3. Doubled
One kilogram of styrofoam has _____ density than one kilogram of iron
A small
er
A greater
The sam
e
83%
9%9%
1. A smaller2. A greater3. The same
If a loaf of bread is compressed, its _____
Mas
s dec
rease
s
Volume incre
ases
Densit
y incre
ases
None of th
ese
0%
50%
36%
14%
1. Mass decreases2. Volume increases3. Density increases4. None of these
A wooden block has a mass of 800 g and a volume of 2 cm3. What is the block’s density?
800 g
/cm3
400 g
/cm3
1600
g/cm3
0.4 g
/cm3
0.02
5 cm3/g
4%
83%
0%4%9%
1. 800 g/cm3
2. 400 g/cm3
3. 1600 g/cm3
4. 0.4 g/cm3
5. 0.025 cm3/g
Water pressure is greatest against the _____
Top of a su
bme..
.
Bottom of a
su...
Sides o
f a su
b...
None of th
ese
23%14%
5%
59%1. Top of a submerged object
2. Bottom of a submerged object
3. Sides of a submerged object
4. None of these
A completely submerged object always displaces an amount of fluid equal to its own:
Volume
Weig
ht
Densit
y M
ass
57%
0%0%
43%
1. Volume2. Weight3. Density4. Mass
One liter of water has a mass of:
1 kg 1
N
Both of thes
e
Neithe
r of th
ese
64%
32%
5%0%
1. 1 kg2. 1 N3. Both of these4. Neither of these
What is the buoyant force acting on a 34,000 N ship that is floating in the ocean?
Less t
han 34
,000 N
34,00
0 N
More
than 34
,000 N
Depen
ds on th
e den
si..
0% 0%10%
90%1. Less than 34,000 N2. 34,000 N3. More than 34,000
N4. Depends on the
density of the sea water
What is the weight of water which is displaced by a floating 34,000 N ship?
Less t
han 34
,000 N
34,00
0 N
More
than 34
,000 N
Depen
ds on th
e ship
..
Depen
ds on th
e den
s...
0%
58%
26%
5%11%
1. Less than 34,000 N2. 34,000 N3. More than 34,000 N4. Depends on the ship’s
shape5. Depends on the
density of the seawater
An object that is partly or entirely immersed in a liquid is buoyed up by a force that is:
Equal to
its own w
eight
Equal to
the weig
ht of...
Equal to
the den
sity o
...
Equal to
the volume o
...
10% 14%5%
71%1. Equal to its own
weight2. Equal to the weight of
the fluid it displaces.3. Equal to the density of
the fluid it is in.4. Equal to the volume of
the fluid it is in.
A rock suspended by a weighing scale weighs 5.0 N out of water and 3.0 N when submerged in water. What is the buoyant force acting
on the rock?
5.0 N
3.0 N
2.0 N
8.0 N
None of th
ese
5%
23%
0%5%
68%
1. 5.0 N2. 3.0 N3. 2.0 N4. 8.0 N5. None of these
Compared to an empty ship, the same ship loaded with styrofoam will float:
Higher in th
e wate
r
Lower in
the w
ater
At the s
ame l
evel
in t..
33%
14%
52%1. Higher in the water2. Lower in the water3. At the same level in
the water.
A block of styrofoam floats on a lake while a block of lead with equal volume lies submerged at the bottom of the lake. The buoyant force is
greatest on the:
Styrofo
am Lea
d
Is th
e sam
e for b
oth
17%
74%
9%
1. Styrofoam2. Lead3. Is the same for both
A suction cup sticks to a wall. It is ____.
Pulled t
o the w
all by .
..
Pushed
to th
e wall
by...
Both of thes
e
Neithe
r of th
ese
50%
14%18%18%
1. Pulled to the wall by the vacuum
2. Pushed to the wall by the atmosphere
3. Both of these4. Neither of these