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PHY101
Chapter 4 Review
Study of Matter
Study of Matter
Basics
Pressure
Density
Fluid
Equations
Buoyancy
Potpourri
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Basics
$100
What are the parts of an atom?
ANSWER
Basics
$200
Atoms combine to form
ANSWER
Basics
$300
What are the 4 states (phases)
of matter?
ANSWER
Basics
$400
What is a fluid?
ANSWER
Pressure
$100
What is pressure?
ANSWER
Pressure
$200
What is atmospheric pressure?
ANSWER
Pressure
$300
What does a barometer do?
ANSWER
Pressure
$400
What are the units of
pressure?
ANSWER
Density
$100
What is density?
ANSWER
Density
$200
What is weight density?
ANSWER
Density
$300
What are the units of density?
ANSWER
Density
$400
What is the density of water?
ANSWER
Fluid Equations
$100
What is the law of fluid
pressure?
ANSWER
Fluid Equations
$200
What is the equation of
continuity?
ANSWER
Fluid Equations
$300
What is Bernoulli’s Principle?
ANSWER
Fluid Equations
$400
What is Pascal’s Principle?
ANSWER
Buoyancy
$100
If an object is submerged, it
will displace its ________ in
fluid.
ANSWER
Buoyancy
$200
What is specific gravity?
ANSWER
Buoyancy
$300
What is Archimedes Principle
(Buoyancy force)?
ANSWER
Buoyancy
$400
What would happen if you
placed an ice cube in pure
vodka?
ANSWER
Potpourri $100
A hollow sphere has an average density of
6 g/cm3 and a mass of 12 g.
What is the volume of the sphere?
ANSWER
Potpourri $200
On a day when a water barometer reads
10 m, what is the total pressure at the
bottom of a 30-m deep tank of water?
a. 1 atm
b. 2 atm
c. 3 atm
d. 4 atm
ANSWER
Potpourri $300
On a day when the mercury column in a
barometer on top of a mountain stands 40 cm
tall, how high would the column in a water
barometer be? The density of mercury is 13.6
times that of water.
a. 368 cm
b. 500 cm
c. 544 cm
d. 680 cm
ANSWER
Potpourri $400
A hollow sphere has an average density of 3 g/cm3 and a
mass of 15 g.
What will the sphere weigh under water?
a. 45 mN
b. 98 mN
c. 85 mN
1 mN =.001 N
d. 80 mN
ANSWER
Basics
$100
Answer
What are the parts of an atom?
Proton positive charge in the nucleus of an atom.
Atomic # (Z) = # of protons
determines element
Neutron
neutral particle in the nucleus of an atom.
Neutron # (N) = # of neutrons
determines isotope
Electron
negative charge in the outer shell of an atom.
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Basics
$200
Answer
Atoms combine to form
Molecules.
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Basics
$300
Answer
What are the 4 states (phases) of matter ?
Solid
Rigid; retain their shape unless distorted by a force.
Liquid
flows readily; conform to the shape of a container; fixed volume
Gas
flows readily; conform to the shape of a container; no fixed
volume
Plasma superheated ionized gas
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Basics
$400
Answer
What is a fluid?
Fluids flow.
Liquids, gases, and plasmas are fluids.
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Pressure
$100
Answer
What is pressure?
The force per unit area for a force acting
perpendicular to a surface.
Pressure = F/A
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Pressure
$200
Answer
What is atmospheric pressure?
PATM = 101 kPa = 14.7 psi = 760 mm of mercury (Hg)
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Pressure
$300
Answer
What does a barometer do?
Measures atmospheric pressure
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Pressure
$400
Answer
What are the units of pressure?
SI
cgs
common
1 N/m² = 1 Pascal = 1 Pa
1 dyne/cm²
1 pound/inch² = 1 psi
1 psi = 6890 Pa = 68900 dyne/cm²
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Density
$100
Answer
What is density?
The mass per unit volume of a substance.
Density = D = m/V
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Density
$200
Answer
What is weight density?
The weight per unit volume of a substance.
Density Weight = DW = Weight/V
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Density
$300
Answer
What are the units of density?
SI
1 kg/m³
cgs
1 g/cm³ = g/ml
common 1 slug/ft³ or Weight density in lbs/ ft³
1 kg/m³ = 0.001 g/cm³ = 2.42 slug/ft³
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Density
$400
Answer
What is the density of water?
DWATER = 1000 kg/m³ = 1 g/ml = 62.4 lbs/ft³
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Fluid Equations
$100
Answer
What is the law of fluid pressure?
The pressure at any point in a fluid is
determined by the weight of the fluid
above.
P = Dgh
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Fluid Equations
$200
Answer
What is the equation of continuity?
Flow rate = R = Volume/time = constant
R = A1*v1 = A2*v2
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Fluid Equations
$300
Answer
What is Bernoulli’s Principle?
P1 + Dv1²/2 + Dgy1 = P2 + Dv2²/2 + Dgy2
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Fluid Equations
$400
Answer
What is Pascal’s Principle?
Any additional pressure in a fluid is
passed on uniformly throughout the fluid.
P = F1/A1 = F2/A2
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Buoyancy
$100
Answer
If an object is submerged, it
will displace its VOLUME
in fluid.
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Buoyancy
$200
Answer
What is specific gravity?
SG = Density pf object/Density of water
If an object sinks, SG > 1
If an object floats. SG < 1
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Buoyancy
$300
Answer
What is Archimedes Principle
(Buoyancy force)?
The upward buoyancy force on an object partly or completely
immersed in a fluid is equal to the weight of the fluid displaced.
B = mg FLUID = DFLUID gV
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Buoyancy
$400
Answer
What would happen if you placed an
ice cube in pure vodka?
It would sinks.
Ice is less dense than water but more dense
than alcohol.
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Potpourri $100
Answer
A hollow sphere has an average density of
6 g/cm3 and a mass of 12 g.
What is the volume of the sphere?
V = m/D = 2 cm³
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Potpourri $200
Answer
On a day when a water barometer reads 10 m, what is
the total pressure at the bottom of a 30-m deep tank of
water?
a. 1 atm
b. 2 atm
c. 3 atm
1 atm for air and 3 atm for water = 4 atm
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d. 4 atm
Potpourri $300
Answer
On a day when the mercury column in a barometer
on top of a mountain stands 40 cm tall, how high
would the column in a water barometer be? The
density of mercury is 13.6 times that of water.
a. 368 cm
b. 500 cm
c. 544 cm
d. 680 cm
Ht of Water = 40cm * 13.6 = 544 cm
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Potpourri $400
Answer
A hollow sphere has an average density of 3 g/cm3 and a
mass of 15 g. 1 mN =.001 N
What will the sphere weigh under water?
a. 45 mN
b. 98 mN
c. 85 mN
Volume = 15g/(3 g/cm3 ) = 5 cm³
Weight of object = mg = 147 mN
Weight of water = mWg = 49 mN
Total Weight in water = 98 mN
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d. 80 mN
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