Fall 2002
Physics 102.002
THIS SITE CONTAINS THE CLASS SCHEDULE, GRADING POLICY,
HOMEWORK ASSIGNMENTS, and
TEST ANSWERS
Meets: Tues / Thur 1100-1215
Regener Hall 103
Instructor: Professor
Marcus Price
Text:
Conceptual Physics, 9th ed. (8th ed. is acceptable), Paul G. Hewitt
Aug. 20 Philosophy,
Background
READ: Chapt. 1
22
Basics, Intro Motion
2
& 3
27
Lets get MOVING Force and Motion
4 & 5
29
Action / Reaction
6
Sept 3 Momentum--the
bigger they are--
7
5
Get Energized
8
10
Round and Round
9
12
Gravity and Orbits
10
17
TEST (chapters 1-10)
REVIEW
19
What’s the Matter??
11
24
Solids and Liquids
12 & 13
26
Gas and Plasma--the stuff of the universe
14
Oct. 1 When you’re
hot--you’re hot! Heat
15
3
Heat Transfer and Phase Change
16
& 17
8 TEST 2 (chapters
11-17)
REVIEW
10
FALL BREAK
15
Thermodynamics--WOW!
18
17
Good Vibrations!!
19
22
Sound and Music!
20
& 21
24
Electrostatics--Shocking!
22
29
Electricity--voltage and current--AC / DC
23
31
Magnetic attraction!!
24
Nov. 5
TEST 3 (Chapters 18-24)
REVIEW
7
Magic? Induction
25
12
Light and Color
26 & 27
14
Optics -- wonders of light--Light Waves
28 & 29
19
Interference and Making light
29 & 30
21
Atoms and Light
31 &32
26
TEST 4 (Chapters 25-32)
REVIEW
28
THANKSGIVING BREAK
33
Dec. 3 Radioactivity,
Atomic Power
34
5 Einstein and Relativity
35 & 36
December 10th FINAL EXAMINTION--ALL MUST TAKE
REVIEW
ALL CHAPTERS
10 A.M. IN REGENER
HALL 103
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GRADING POLICY
Your grade in this course will be based on a combination
of things.
You will have Four Tests during the semester. I will take
the three highest scores of these
in use in my grading formula. Your home work will count
for 10% of your grade. Pop quizes
and attendance will count an additional 5%.
EVERYONE IN THE COURSE MUST TAKE THE FINAL EXAMINATION!!!
Your final grade will be taken from the following:
The scores for your three hourly test plus homework and pop-quizes.
OR
Your final examination results. (UNM ID will be required
at the exam)
I will give of the higher of the two grades.
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OFFICE HOURS: Tues. after class in room 109 RH. Thurs.
after class in 109 RH
or by appointment 277 2616 rmprice@as.unm.edu
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ASSIGNMENTS Write clearly and carefully.
Name and assignment number on paper please
1. Due Thur 22 Aug: Write a paragraph on
the measurement of the size of the earth by Eratothenes.
Include a discusion of his assumptions
and the effect of errors.
*************************************************
2. Due Thur 28 Aug: Write a paragraph on why gravitational
and contact forces
are important in your life
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3. Due Thursday 5 September: In Hewett
9th edition:
Chapter 1, page 17, Do
Review Questions 6 and 7,
2, page 36, Exercises 3, 7,
and 26,
3.
page 52, Exercises 7, 17, 35,
4.
page 66, Exercise 25
*************************************************
4. Due Thursday 12 September in class. Hewett
9th edition
Chapter 5. page 82, Exercises 8,
17, 35
6. page 101, Exercises 20, 44
7
page 121, Exercises 7, 19, 40
8
page 149, Exercises 3 (and explain why), 16, 50
9 page 174, Exercises 14, 18, 43
*************************************************
5. Due Thursday 26 September in class. Hewett
9th Edition
Chapter 9. page 174, Exercises 16, 42
10. page 199, Exercises 21. 41, 47, Problem 3
11. page 223, Exercises 2, 5, 21, Problem
4
12. page 243, Exercises 1, 24, 25, Problem 1
*************************************************
6. Due Thursday 3 October in class. Hewett 9th Edition
Chapter 11 Exercises 3 and 17
12
Exercises 3 and 17
13 Exercises 3 and 17
14 Exercises 3 and 17
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7. Due Thursday 24 October in class. Hewett 9th edition
Chapter 18 Problems 2, 5
19 Problems 1, 4, 7
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8. Due Thursday Oct 31 in class. Hewett 9th Edition
Chapter 20 Exercises 5, 11,
20, 36
21 Exercises 1, 2, 8, 15,
31
22 Exercises 1, 2, 22
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University of New Mexico
TEST 2
Phys102-002
Dept Physics and Astronomy
Chapters 11-16
Prof Price Fall 2002
NAME____________________________
INSTRUCTIONS: Read the problems CAREFULLY. Select
the best answer. Mark answers on this sheet and on the blue test
answer sheet. Assume SI units unless otherwise stated. g =
10 m/s for calculations.
1. According to the book, there are 88 naturally occurring
elements, each one different from all of the others.
a. yes
b. no
c. sometimes
2. The fact that you can see very small pollen grains jiggled
around due to atomic collisions is called:
a. kinetic energy b. heat energy
c. Brownian motion
d. Barometric pressure
e. none of these
3. In atomic reactions (fusion and fission) individual atoms
a. are destroyed
b. multiply in number
c. turn into energy
d. change color e. none
of these
4. A scanning tunneling electron microscope allows us to ‘see’
a. tunnels between atoms in matter
b. bacteria that have never been seen before
c. the positions of atoms on a solid surface
d. atoms as they tunnel
to a solid surface
e. all of the atoms in a grain of sand
5. The most common element in the universe is
a. water b. hydrogen
c. helium
d. oxygen e. carbon
6. A nucleus in a metal atom contains
a. atoms b. protons
c. protons, neutrons, and electrons
d. protons and electrons e. electrons
7. The density of a solid is given by
a. its mass per unit volume
b. its weight per unit volume
c. its force per unit volume
d. its pressure per unit volume
e. the volume per unit mass
8. The pressure in a fluid increases
a. when you exert any force under the surface
b. as you go deeper into that fluid
c. as you come to the suface (due to buoyancy)
d. never, because fluids are incompressible
9. When a body in a fluid is acted on by a force equal to the
weight of the fluid being displaced by the body we call that
a. pressure
b. fluid dynamics c. displacement force
d. buoyancy e. floating
10. A body will float in water when
a. its density is more than the density of
water b. its density is less than the density o
f water
c. when it has no density
d. surface tension is not present e.
none of these
11. We do not feel the pressure from the gases in the atmosphere
above us
a. because they are much lower density than
our bodies b. the pressure is the
same from all directions
c. they are too light to cause any pressure
d. unless we have a barometer present
e. none of these
12. When we suck on a straw in a drink, the fluid comes up the
straw to our mouth because
a. it can feel our tongue pressure
b. atmospheric pressure forces it up
c. it becomes weightless
d. the fluid wants to rise
e. capillary attraction in the straw
13. A barometer measures
a. force
b. weight c. pressure
d. density
e. electric charge
14. When water flows through a pipe, if the pipe diameter becomes
smaller, the water will
a. break the pipe
b. get cooler c. increase
its pressure d. flow faster
e. none of these
15. The roof on your house is less likely to be blown off during
a wind storm if
a. you leave the door open
b. if you turn off all running water
c. there is an updraft
d. the wind speed suddenly changes
e. it is also raining
16. A mixture of ions and electrons is called a
a. electron gas b.
hot air c. plasma
d. vacuum
e. magnetic window
17. Heat is a form of
a. pressure
b. temperature c.
energy d. potential energy
e. magnetism
18. The specific heat capacity of a substance
a. gets lower when it is cool
b. is proportional to the temperature rise when adding heat
c. tells when a substance will melt if you
add heat d. tells how much a
substance will expand when heated
19. For a given rise of temperature, all metals expand by the
same proportional amount.
a. true
b. false
c. depends on the temperature d.
it is not known
20 heat can be transferred by
a. radiation, conduction, capillarity
b. radiation, convection, conduction
c. conduction, wind, water
d. radiation, transpiration,
conduction e. none are right
21. when you heat a piece of sheet metal with a hole in it, the
hole
a. welds shut
b. gets larger c.
gets smaller d. stays the same size
e. warps
22. A bi-metalic strip is used in
a. thermostats
b. generators c. searching a robot
d. railroad rails e. none of these
23. Heat is transported at the same rate through all conductors
a. true
b. false c. depends on
the temperature
24. Good conductors of heat are generally
a. metals
b. plastics c. alloys
d. semiconductors
e. insulators
25. Unlike most liquids, water has its maximum density at
a. zero C b. room temperature
c. +4 C
d. -4 C e. doesn’t change
density
26. Material that absorbs energy (like sunlight) well is
also
a. a good reflector
b. a good store house of energy c. a good emitter
of energy d. hot
27. Albuquerque nights can be very cold in winter because of
a. radiation cooling
b. canyon winds c.
cold air rising to the mountains d. clouds
28. The cooling of a substance depends on
a. what it is made of
b. its density c.
how long it has been hot
d. the difference in temperature between the body and its surroundings
29. Convection consists of
a. a few atoms moving far
b. jiggling of atoms c. heat conduction
d. motion of the fluid
30. Electromagnetic waves carry
a. only radio and TV transmissions
b. energy c only heat
d. electricity e.
atoms
31. The Greenhouse Effect occurs when
a. there is too much ozone in the atmosphere
b. radiation from the earth is trapped by gases
in the atmosphere
c. carbon dioxide destroys ozone
d. there are no clouds in the sky
e. only in the daytime
32. The connection between buoyancy and convection is
a. no connection at all
b. only applies to hot air balloons
c. lower density fluid rising
d. due to potential energy
e. true only in the oceans
33. The origin of almost all of the power we use here on Earth
is
a. deep radioactive deposits
b. due to rain from the atmosphere
c. from burning wood
d. from the Sun originally.
e. none of the above
34. If the wind rises to a higher velocity, it has (compared to
still air)
a. a higher pressure
b. a lower pressure c.
the same pressure
36. 37. 38. NOTE: show the same answer on 36, 37 and 38
to get full credit. SHOW your calculations on the white test paper.
You are given a box with dimensions one meter by one meter by ½ meter.
It has gas in it at a pressure of 50,000 pascals. Assume the box
is gas tight. Now crush the box to a volume one quarter of its original
volume. Use Boyle’s law to determine the final pressure in the box.
a. 6250 pa b. 50,000
pa c. 100,000 pa
d. 200,000 pa e. 400,00
pa
V1P1 = V
2P2 Note, the LHS
is a constant. Thus if V2 goes down by a factor of 4, P2 must
go up by a factor of 4.
P2 = 4 x P1 = 4 x 50,000pa = 200,000
pa
39. Fast flowing water has ___________than still water.
a. more pressure b. the same
pressure c less pressure
d. depends on size of pipe
40. The most common state of matter in the universe is:
a. solid b. liquid
c. gas d. plasma
e. ions
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End of Examination ***********************************
University of New Mexico
TEST 1
Phys102-002
Dept Physics and Astronomy
Chapters 1-9
Prof Price Fall 2002
ANSWER KEY--Bold Face
INSTRUCTIONS: Read the problems CAREFULLY. Select
the best answer. Mark answers on this sheet and on the blue test
answer sheet. Assume SI units unless otherwise stated. g
= 10 m/s for calculations.
1. What number does 4.9 x
10 e-2 correspond to?
a. 49
b. 4900 c. 490
d. 0.049 e.0.0049
2. A hypothesis is
a. a wild guess
b. the long side of a right triangle
c. a large gray animal
d. an educated guess e. a
careful measurement
3. A truck is traveling west at 50 Miles per
hour. How far does it go in four hours?
a. 4 miles b. 50 miles
c. 100 miles d.
200 miles e. 400 miles
4. How long will it take to go 800 miles, if
you average 50 miles per hour?
a. 5 hrs b. 8 hrs
c. 16 hrs d. 40 hrs
e. cannot tell from information
5. A snowboarder is traveling at 2 m/s and accelerates
down a hill at 3 m/s for four seconds. His speed is now:
a. 2 m/s
b. 3 m/s c. 4 m/s d. 12 m/s
e. 14m/s
6. You throw a ball, A, (HORIZONTALLY)
off of a cliff (onto level ground below) at the same time as your friend
drops a ball, B, from the same place. Which ball will reach
the ground first?
a. A
b. B c. both land at the
same time
7. Which ball has the highest total speed when
it hits the ground?
a. A b.
B c. both have the same speed
8. In problem (7) above, why did you give the
answer you did?
a. both fall the same distance
b. both weigh the same c. vector addition
d. Newton’s FIRST LAW
e. one ball travels further
9. Which statement below is TRUE based on Newton’s
First Law?
a. An object at rest with no net force on
it will stay at rest.
b. A moving object with no net force on it will
slowly come to rest.
c. An object with a net force will maintain
its constant speed.
d. An object that has a net force on it will
change either its speed or direction.
e. If an object’s speed is changing, but not
its direction, there is no force on it.
10. If a ball is dropped from the top of a tall
building, what is its speed after three seconds?
a. 10 m/s b. 3 and 1/3 m/s
c. 30 m/s d. 20 m/s
11. In problem (10) what will the acceleration
of the ball be after three seconds?
` a. 10 m/s2
b. 30 m/s c. 0 m/s d.
cannot tell from information given
12. If a 1000 Kg car accelerates
at two meters per second squared, what is the force of the back tires
(together) on the pavement (in the direction of the acceleration)?
a. 500N b. 1000
N c. 2000 N d. 4000
N e. 500 J
13. The force required to maintain an
object at constant velocity in free space is
a. zero
b. the mass of the object
c. the weight of the object
d. the force required to stop it.
14. A rock is thrown vertically into the air.
At the top of its path, its acceleration (m/s2 ) is:
a. zero b. 9.8
c. between 0 and 9.8
d. greater than 9.8 e.
none of these
15. Two 10m Newton weights are hanging on the
spring scale as shown. The reading on the scale is
a. zero b.
ten N c. 20 N d. 40
N e. cannot say from information
given
16. A piece of rope is pulled by
two people in a tug-of-war. Each pulls with 400 N of force.
What is the tension in the rope?
a. zero
b. 400 N c. 800 N d. 1600
N e. none of these
17. A rifle recoils from firing a bullet.
The speed of the rifle’s recoil is small because the
a. force against the rifle is smaller than against
the bullet.
b. momentum is mainly concentrated in the bullet.
c. rifle has much more mass than bullet.
d. momentum of the rifle is smaller.
18. A heavy truck and a small
car roll down a hill. Neglecting friction, at the bottom of the
hill, the heavy truck will have more
a. speed b. acceleration
c. momentum d.
all of these e. none of these
19. Compared to falling
on a wooden floor, a wine glass may not break when it falls to a carpeted
floor because of the
a. lesser impulse in stopping. b.
longer time to stop.
c. both of these
d. neither of these
20. If a 4 kg ball has a momentum of 12 kg m/s,
what is the ball’s speed?
a. 3 m/s b. 4 m/s
c. 12 m/s d. 48 m/s e.
none of these
21. A one kg chunk of putty moving
at 2 m/s collides with and sticks to a 5-kg bowling ball that is initially
at rest. The bowling ball and putty then move with a momentum
of
a. zero
b. 10 kg m/s c. 2 kg m/s
d. 5 kg m/s
e. 7 kg m/s
22. A golf ball moving with one
unit of momentum strikes and bounces off of a heavy bowling ball that
is initially at rest, but free to move. The bowling ball is set
in motion with a momentum of
a. less than one unit
b. more than one unit
c. exactly one unit d. not enough information
23. When a object is raised above
the ground it gains a certain amount of potential energy. If the
same object is raised twice as high it then has
a. the same PE b.
twice as much PE c. four
times as much PE d. ½
as much PE
24. An object that has kinetic
energy must be
a. moving b.
falling c. at an elevated
position
d. at rest e. hot
25 When a (moving) car is braked to a stop,
its kinetic energy is converted to:
a. potential energy b.
stopping energy c.
energy of motion d energy of rest
e. heat
26. When an object has potential
energy, it is probably because of its:
a. speed b.
momentum c. acceleration
d. position
e. temperature
27. In the figure shown, the ball has
the maximum potential energy when it is at A
28. In the same figure as (27) the ball
has maximum kinetic energy when it is at
C
29. In the same figure as (27) the ball
has its maximum speed when it is at
C
30. Kinetic energy and potential energy are
equal at B
31. A box is pushed a distance of three meters
with a force of 20 N (in the same direction the box moves).
How much work is done on the box?
a. none (it was not lifted) b.
3 J c. 20 J
d. 60 J
32. A woman lifts a box from the floor and then
moves with constant speed to the other side of the room where she puts
the box down. How much work does she do while walking across
the room at constant speed? a. zero
J b.
more than zero
c. cannot say without more information
.
d. less than zero (she got back energy when she set the box
down)
33. Which has the greater kinetic energy: a car of
mass M moving a velocity V, or a car of M / 2 moving
at a velocity of 2V ?
a. the slower car b. the faster car
c. both have the same kinetic energy
d. cannot say with this information
34. What does an object
have when moving that it NEVER has when at rest?
a. momentum
b. energy c. mass
d. inertia
e. none of these
35. A heavy and a light object released from
the same height above the ground in a vacuum have equal:
a. weights b.
momenta c. energies
d. all of these
e. none of these
36. If you drop two balls
into the swinging-ball apparatus, and only one came out--but at twice
the velocity of the incoming balls, this would be a violation of conservation
of
a. momentum b.
energy c.
both d. neither
37. If you use larger diameter tires on
your car than specified by the maker, your speedometer will show
a. the speed you are actually going
b. a speed faster than you are going
c. a speed slower than you are going
d. zero--it will not work
38. Which moves
faster in m / s on a merry-go-round: a horse on the inside, or a
horse on the outside of the circular platform?
a. inside
horse
b. outside horse c. both the
same speed
39. A coin and a ring
of the same mass are rolled down an inclined plane, starting at the same
time. Which one will reach the bottom first?
a. coin
b. ring c. both
reach the bottom at the same time
40. The famous Leaning Tower of Pisa doesn’t
fall over because its center of gravity is
a. above a place of support
b. relatively low for such a tall structure
c. stabilized by its design
d. displaced from its center
41. When a spinning ice skater brings her arms
inward toward her body, her rotational speed
a. increases
b. decreases c.
remains the same d. she
takes off into the air
42. For a system in mechanical
equilibrium, the a. net force must
be zero b. net torque must be zero
c. both a and b
d. none of these answers
43. Suppose you are on a Ferris wheel at the
State Fair, seated 10 m from the rotation axis. If you make a
complete revolution once each minute, your linear (tangential)
velocity is:
a. 10 m/min b.
31.4 m/min c. 62.8 m/min
d. 100 m/min
e. not enough
information
44. According to Newton, the greater the masses
of two objects, the
a. less the gravitational force between them
b. greater the gravitational force between
them
c. the greater the force between them by the square of the
masses. d. the further apart they
were.
45. If your mass, the mass of the Earth, and
the mass of everything in the solar system were twice as much
as it is now, yet everything stayed the same size, your
weight on Earth would:
a. be the same b. double
c. quadruple (X4) d. be eight times
larger than now.
46. The factor most directly responsible for
making a black hole invisible is its:
a. size b. mass
c. color d. surface escape velocity
e. small size
47. What is most responsible for the ocean tides
on earth?
a. the Sun b.
the Moon c. the outer planets
d. Jupiter e.
none of these
48. The main reason for ocean tides is that
a. the moon and the sun pull together at high
tide and opposite at low tide.
b. the pull of the moon is greater on the
ocean nearer the moon and less on oceans further away.
c. the pull of the moon is grater because it
is closer to the Earth than the Sun.
d. the pull of the Sun and moon on the oceans
are in opposite directions.
49. Inside a freely falling elevator, there
would be
a. no gravitational force on you. b.
no apparent weight for you. c. both
a and b d. none of
these
50. If an object has kinetic energy, then it
must also have
a. momentum b.
impulse c. acceleration d.
force on it e. none
of these
51. If a 1000 kg car, traveling at 20 m/s, has
a braking force of 1000 N acting on it, how long will it take to
stop? a. 2 sec
b. 10 sec c. 20 sec
d. 50 sec e. not enough information
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Sample test questions and subjects for test on Tuesday 8 October in
class. (Test 2)
Chapters 11 through 16
Each element is different from every other element
yes
no
sometimes
In atomic reactions (fusion and fission) individual atoms
are destroyed
give up their energy
multiply in number
none of the above
Today we can see individual atoms
x-ray pictures
with a scanning tunneling electron microscope
with a regular optical microscope
in our dreams
The most common element in the universe is
water
helium
carbon
oxygen
hydrogen
the density of a material is
its mass per unit volume
its weight per unit volume
its force per unit volume
its pressure per unit volume
in a fluid pressure increases
when you exert any force under the surface
as you go deeper
as you come to the suface (due to buoyancy)
never because fluids are incompressible
when a body in a fluid is acted on by a force equal to the weight
of the fluid being displaced by the body we call that
pressure
fluid dynamics
displacement force
buoyancy
floating
a body will float in water when
its density is more than the density of water
its density is less than the density of water
when it has no density
the surface tension is not present
surface tension also causes
capillarity
increasing water pressure
faster fluid flow
pressure with increasing depth
we do not feel the pressure from the gasses in the atmosphere
because they are much lower density than our bodies
the pressure is the same from all directions
they are too light to cause any pressure
unless we have a barometer present
when we suck on a straw in a drink, the fluid comes up the straw because
it can feel our tongue pressure
atmospheric pressure forces it up
it becomes weightless
the fluid pressure forces it up
capillary attraction in the straw
a barometer measures
force
weight
pressure
density
when the cross section of a pipe with flowing water in it becomes
smaller, the water will
break the pipe
get cooler
increase its pressure
flow faster
in a strong wind storm, the roof on your house is less likely to be
blown off if
you leave the door open
if you turn off all running water
there is an updraft
the wind speed suddenly changes
a plasma is a mixture of
gasses
warm fluids
electrons and positrons
electrons and ions
heat is a form of
pressure
temperature
energy
potential energy
the heat capacity of a substance
gets lower when it is cool
is proportional to the temperature rise when adding
heat
tells when a substance will melt when you add heat
tells how much a substance will expand when you
add heat
all materials expand the same amount for a given rise in temperature
true
false depends
on the temperature
heat can be transferred by
radiation, conduction, capillarity
radiation, convection, conduction
conduction, wind, water
radiation, transpiration, conduction
heat is transported at the same rate through all conductors
true
false depends on temperature
good conductors of heat are generally
metals
plastics
alloys
semiconductors
insulators
888888888888888888888888888888888888888888888888888888888888888888888888
Sample questions for TEST 3 chapters 17-23
Boiling is a cooling process.
always never
sometimes for water only
Water freezes and melts at the same temperature.
only on the Kelvin scale
true false
only at sea level
In a change of phase energy
a. is absorbed
b. is released
c. is not involved
d. a & b
e. none of the above
Heat naturally flows from
hot to cold
cold to hot
both ways
neither way
Internal energy in a system is generally contained in
small atomic ovens
movement of the atoms of the system
an expanding gas
a high pressure lattice
Gas temperature rises when pressure is
increased decreased
kept the same replaced by a vacuum
radiates
As you go higher in the atmosphere, with each kilometer the temperature
rises by 5 C falls
by 5 C rises by 10 C
falls by 10 C none of these
As moist air rises,
it cools and can rain
it gets warmer
when you have a temperature inversion
it cannot rise, it must lose its moisture first
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Heat engines have higher efficiency for the ____________possible heat ____________.
a. hottest source
b. hottest sink
c. coldest source
d. coldest sink
e. none of the above
Typically an automobile gasoline engine has an efficiency of approximately
a. 5%
b. 15% c. 25 %
d. 35% e. 55%
Entropy can be associated directly with
a. order b. high temperature
c. disorder
d. time e. low temperature
Vibrations are generally found
a. in all matter
b. only in physics labs
c. only in music
d. only in pendulums
e. only in waves
In the Doppler effect the frequency of the sound source
a. gets lower
b. gets higher
c. stays the same
d. goes from high to low
e. none of these
The Doppler effect can be used to
a. measure the speed of a car
b. estimate distances to galaxies
c. measure star spin rates
d. all of the above
e. none of the above
Sonic boom occurs
a. only when an aircraft breaks the sound barrier
b. all of the time while the plane is supersonic
c. all of the time while the plane is subsonic
d. only inside the plane
e. only on the ground
What is the frequency that corresponds to a period of 0.1 second?
a. 1/10 Hz b. 1 Hz
c. 10 Hz d. 100 Hz
e. 0.1 Hz
If sound travels at 340 m/sec in air, what is the wavelength of a tone
of 680 Hz?
a. 0.1 m b. 0.2 m
c. 0.5 m d. 1 m
e. 2 m
A good music performance hall should have its walls covered with a surface
that
a. reflects sound waves
b. amplifies sound waves
c. refracts sound waves d.
absorbs sound waves
Sound waves are ____________ waves.
Transverse
Longitudinal
Oblique
Triangle
When two waves of the same frequency but moving in opposite directs meet
(like on a rubber rope)
they can only increase the aplitude of the resulting
wave sum
they can only reduce the ampltude of the resulting wave
sum
either of the above
you get only nodes
you get only anti-nodes
The quality of the toe from a particular musical instrument depends mostly
on
size of the instrument
the fundamental frequency of the instrument
the fundamental and harmonics
none of the above
The human ear hears best at about ________Hz./
20 100
3000 10,000 20,000
The hynab ear can distinguish the difference in sound levels over
a frequency range of intensity of
10 10 10
10 10
Electrical forces are much ______________gravitional forces.
stronger weaker the
same strength as cannot be measured
There are two kinds of electrica charge
like charges attract
unlike charges attract
they do not interact at all
` they are differenct in magnitude
Electric and gravitational forces are propotional to
1/Forece 1/distance
1/ distance squared distance distance
squared
New positive charges can be created by
friction between your feet and a rug
friction between glass and a silk cloth
both of the above
neither, charge cannot be created
Electric current can be generated by
chemical reactions
mechanical friction
a battery
a generator
all of the abve
In an electrical current, the thing that is generally moving is
negative charge
positive charge
both positive and negative charge
electric field
electric potential
Good conductors of electricity are generally
wood
plastic
pure water
metal
none of the above
Electrical voltage is like a _________, forcing charges through a circuit.
resistance
pressure
conductor
insulator
charge
In the USA, electrical current is
voltage current
conver4ted current
direct current
alternating current
none of these
The electric power that is available depends on
the current and the voltage
the number of charges in the curcuit
the resistance of the circuit
the voltage source
[Sine wave pattern drawn in]
Identify wavelenght frequency amplitude
END OF SAMPLE QUESTIONS
***************************************************************************************************************
***************************************************************************************************************
UNIVERSITY OF NEW MEXICO
NAME_______________________________
DEPARTMENT OF PHYSICS AND ASTRONOMY
Physics 102 Fall 2002 Prof Price
TEST NUMBER 3
1. Which of the following occur at the same temperature:
A melting B. boiling
C. freezing D.
A&B E. A&C
2. Boiling is a cooling process.
a. always b. never
c. sometimes d. for water only
3. In a change of phase, energy
a. is absorbed
b. is released
c. is not involved
d. a or b
e. none of the above
4. Heat naturally flows from
a. hot to cold
b. cold to hot
c. both ways
d. neither way
5. Internal energy in a system is generally contained in
a. large molecules
b. motions of the atoms of the system
c. hot electrons
d. a high pressure lattice
6. Gas temperature rises in a constant volume when pressure is
a. increased
b. decreased c. kept the same
d. replaced by a vacuum e.
radiates
7. As you go higher in the atmosphere, with each kilometer the temperature
a. rises by 5 C
b. falls by 5 C c. rises by 10
C d. falls by 10 C
e. none of these
8. As warm moist air rises,
a. it cools and can rain
b. it gets warmer
c. when you have a temperature inversion
d. it cannot rise, it must lose its moisture first
9. Generally, in everyday life car engines have higher efficiency for
the ____________ .
a. hottest burning fuel
b. hottest exhaust pipe
c. coolest burning gasoline
d. hottest weather
e. coolest driver
10 Typically an automobile gasoline engine has an efficiency of approximately
a. 5%
b. 15% c. 25 %
d. 35% e. 55%
11. Entropy can be associated directly with
a. order
b. energy c. disorder
d. time e. low temperature
12. Vibrations are generally found
a. in all matter
b. only in physics lab
c. only in music
d. only in pendulums
e. only in waves
13. In the Doppler effect the frequency of the sound source
a. gets lower b. gets
higher c. stays the same
d. goes from high to low e.
none of these
14. The Doppler effect can be used to
a. measure the speed of a car
b. estimate distances to galaxies
c. measure star spin rates
d. all of the above
e. none of the above
15. Sonic boom occurs
a. only when an aircraft breaks
the sound barrier
b. all of the time while the plane
is supersonic
c. all of the time while the plane
is subsonic
d. only inside the plane
e. only on the ground
16. and 17. What is the frequency that corresponds to a period of 0.1
second?
a. 1/10 Hz b. 1 Hz
c. 10 Hz d. 100 Hz e. 0.1
Hz
18. and 19. If sound travels at 340 m/sec in air, what is the
wavelength of a tone of 680 Hz?
a. 0.1 m
b. 0.2 m c. 0.5 m
d.1 m e. 2 m
19. A good music performance hall should have its walls and floors
covered with a material that
a. reflects sound waves
b. amplifies sound waves
c. changes sound waves d.
absorbs sound waves e. distorts sound
waves
20. Sound waves are ____________ waves.
a. Transverse
b. Longitudinal c. Oblique
d. Triangle e. deciBel
21. When two waves of the same frequency but moving in opposite directs
meet in the same medium (like on a rubber rope)
a. they can only increase the amplitude of the resulting
wave sum
b. they can only reduce the amplitude of the resulting
wave sum
c. either of the above
d. you get only nodes
e. you get only anti-nodes
22. The quality of the tone from a particular musical instrument
depends mostly on
a. the size of the instrument
b. the fundamental frequency of the instrument
c. the fundamental and harmonics produced by the
instrument
d. what it is made of
e. none of the above
23. The human ear can distinguish the difference in sound levels over
a range of intensity of
a. 10 b. 10
c. 10 d. 10
e. 10 (All in decibels.)
24. Electrical forces are much ______________gravitational forces.
a. stronger than b. weaker
than c. the same strength as
d. cannot be measured
25. There are two kinds of electrical charge
a. like charges attract
b. unlike charges attract
c. they do not interact at all
` d. they are different in magnitude
26. Electric and gravitational forces are both propotional to
a. 1/force b. 1/distance
c. 1/ distance squared d. distance
e. distance squared
27. New positive charges can be created by
a. friction between your feet and a
rug
b. friction between glass and a silk cloth
c. both of the above
d. neither, charge cannot be created
28. Electric current can be generated by
a. chemical reactions
b. mechanical friction
c. a battery
d. a generator
e. all of the above
29. In an electrical current through a circuit, the thing that is generally
moving is
a. negative charge
b. positive charge
c. both positive and negative charge
d. electric field
e. electric potential
30. Good conductors of electricity are generally made of
a. wood
b. plastic
c. pure water
d. metal
e. none of the above
31. Electrical voltage is like a _________, forcing charges through
a circuit.
a. resistance
b. pressure c. conductor
d. insulator e. charge
32. In the USA, electrical current is
a. voltage current
b. converted current c. direct current
d. alternating current
e. none of these
33. The electric power that is available depends on the
a. current and the voltage
b. number of charges in the circuit
c. resistance of the circuit
d. voltage source
e. length of the circuit
Consider the wave shown below. Identify its characteristics.
34. wavelength
35. frequency
36. amplitude
37.There are numerous charges in all of the objects around us Why don’t
we feel the effects of them?
a. they are held by a gravitational force
b. electric forces act only over very small distances
c. for every + charge there is a - charge, and they cancel
out
d. charges only exert a force when they are moving
e. there is no circuit for them to act through
38.The placement of speakers in a room can affect the quality of the sound
from them.
a. false--it doesn’t matter where you place them
b. true -- it does make a big difference
c. true--but only experts can tell the difference
d. it cannot be measured
39.When clouds blow from the ocean toward a mountain range, they most likely
will drop rain
a. as they go up the side of the mountain facing the ocean
b. just at the top of the mountain
c. as they go down the other side of the mountain
d. not until they are past the mountains
40.Heat can do work
a. if it goes from a hotter to colder body
b. if it goes from a colder to a hotter body
c. only after it has all gone into internal energy
d. no, it can only make something hotter
End of Exam
*****************************************************
University of New Mexico PHYSICS 102
Department of Physics and Astronomy Test 4 Fall 2002 Name_____________________
SAMPLE TEST
The primary additive colors for light are
read and green
red and blue
red blue and yellow
red green and yellow
red green and blue
The primary subtractive colors for pigments are
the same as the previous question
the opposites to the colors of the previous question
each an addition of two or more of the primary additive colors
each a subtraction of two or more of the primary additive colors
none of the above
The eye has special detectors for which colors?
black and white only
the additive primary colors
the subtractive primary colors
another set of three colors
another set of four colors
The lens at the front of the eye
detects the colors
can be adjusted by muscles for far and near focus
is what makes you near or far sighted
is made of glass
does not deteriorate with age
The screen at the back of the eye where the image of the lens is focused is
called the fovea
called the retina
a collection of forward facing nerve endings
adjusted automatically for the intensity of the light
connected to the frontal lobe of the brain
The region of best detection (resolution, color, attention) in the eye is
named the fovea
called the retina
a collection of nerve endings called rods
covers about 50% of our total visual field
called the cornea
A direct current through a circuit will
create a magnetic field around the current carrying wires
not be able to operate any useful electrical equipment
will convert to alternating current if you use a battery
always cause positive charges to move
not be possible at all
A magnetic field will have an acceleration effect on a electron if that particle is
standing still
moving through the magnetic field
no--only if the charge is positive
in a wire
When a changing current in a wire loop causes a current in a nearby wire loop that is called
resistance
magnetic current
induction
a parallel circuit
a series circuit
The electrical wiring in your home or apartment is arranged in
parallel circuits
series circuits
induction circuits
magnetic circuits
An electric motor and an electrical generator
have no resemblance to each other
are both driven by an outside source of rotational energy
can have essentially the same wiring circuit
are both commonly found in homes
The electromagnetic spectrum includes
only radio waves and visible light energy
all frequencies of radiation energy
only currents in circuits
only radio, TV, and visible light energy
ways to read minds
Ultraviolet waves are shorter than visible light and
we see them only when it is dark
are commonly used to cook food
can cause sunburn and skin cancer
are used in spy cameras to penetrate walls
carry less energy
The most penetrating form of electromagnetic waves are
radio waves
microwaves
ultraviolet waves
x-rays
gamma rays
In electromagnetic waves, you find
an electric wave then a magnetic wave, then an electric wave, then a magnetic wave, etc
electric fields pointed in all directions, but no magnetic fields
synchronous electric and magnetic fields at right angles to each other and to the direction of travel
electrons wiggling at a fixed frequency through space
magnetic waves pointing in the direction of wave travel\
Electromagnetic waves sometimes act like particles. Then they are called
wigglers
protons
electrons
inductors
photons
You can convert AC current to DC current by using
only a generator
only a resistor
inductance
a rectifier
a parallel circuit
When an electromagnetic wave travels through space
electrons carry the charge in the wave
steady electrical fields cause steady magnetic fields in the wave
changing electrical fields cause changing magnetic fields in the wave
it penetrates everything it comes to
you can hear it
The receptors in the eye that detect brightness only
always work only in the dark
are called rods
are called cones
are floating in the fluid in the eyeball
are located in the cornea
AC voltage can be increased or decreased by using a
transformer
rectifier
motor
resistor
none of the above
DC voltage can be increased or decreased by using a
transformer
rectifier
motor
resistor
none of the above
For maximum efficiency a transformer should have its coils
pointed north-south
perpendicular to each other
heated
wrapped around a common magnetic metal
none of the above
If the input coil of a transformer has 20 loops and the out[put coil has 100 loops, the voltage will be
increased by a factor of 2000
increased by a factor of 5
decreased by a factor of 2000
decreased by a factor of 5
none of the above
When AC electrical current passes through a transformer
the power out increases
the power out decreases
the power in and out are the same
no--there is no power involved with a transformer, only current and voltage
Light
always acts like a wave
never acts like a wave
can act like a wave or a particle
never acts like a particle
none of the above
A coat could look blue by
scattering all of the yellow light that hits it
absorbing the blue light that hits it
absorbing the yellow light that hits it
addition of the colors that hit it
none of the above
White light is
another color, like blue or red
a combination of all of the colors of the rainbow
the absence of darkness
produced only by the sun
none of the above
In glass light waves are absorbed by atoms and then re-emitted. This causes
the waves to change direction
to lose most of its intensity
the waves to slow down
some colors to reflect away
none of the above
In an electrical circuit, the fuse will blow out if the circuit uses too much
voltage
resistance
induction
current
none of the above
If you illuminate a sharp edge, like a razor blade edge, the light will
show an exact geometrical shadow of the edge
refract around the edge uniformly
cause a diffraction pattern on a distant screen
cause an interference pattern on a distant screen
none of the above
When a light wave illuminates parallel narrow slits in a dark screen the pattern that will appear from the slits
is two narrow lines of light
two overlapping diffraction patterns
a diffraction pattern
a uniform interference pattern
an interference pattern modulated by a diffraction pattern
Because of the way they travel, electromagnetic waves are called
longitudinal waves
transverse waves
wiggler waves
all of the above
none of the above
A changing electric field causes
a changing magnetic field
steady magnetic field
a steady electric field
resistance
none of the above