Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
|
|
|
1.
|
For
the following quantities, these are considered to be vectors: displacement, acceleration.
_________________________
|
|
|
2.
|
Forces of tension always act vertically upward.
______________________________
|
|
|
3.
|
Free
body diagrams include all the forces acting on the object, not just those directly responsible
for the object’s motion. ______________________________
|
|
|
4.
|
The
same forces act on two objects having different masses. The more massive object will experience the
greater acceleration provided the forces are not “balanced.”
______________________________
|
|
|
5.
|
For
an object travelling with uniform circular motion, the centripetal force is always directed radially
outward from the centre of the circle. ___________________________________
|
|
|
6.
|
More work is done to lift a 2.00-kg object a distance of 1.00 m at a constant
velocity than to push a 1.00-kg block a distance of 1.00 m with a force of 19.6 N.
______________________________
|
|
|
7.
|
The
change in gravitational potential energy can never have a negative value.
_________________________
|
|
|
8.
|
Linear momentum is a scalar quantity. _________________________
|
|
|
9.
|
The
average force accurately represents the actual force during a collision.
______________________________
|
|
|
10.
|
The
equation  is only valid far from Earth’s surface.
_________________________
|
|
|
11.
|
As
the altitude of a satellite increases, the time to complete one orbit also increases.
_________________________
|
|
|
12.
|
The
general equation of gravitational potential energy,  , is not
valid near Earth’s surface. _________________________
|
|
|
13.
|
The
binding energy is always equal to the absolute value of the total energy (i.e.,  ). _________________________
|
|
|
14.
|
One
of the ways in which Newton’s law of universal gravitation differs from Coulomb’s law is
that gravitational force can only attract, whereas the electric force can only repel.
________________________________________
|
|
|
15.
|
A
positive test charge is placed in the space between two large, equally charged parallel flat plates
with opposite charges. The electric force on the positive test charge would be greatest near the
negative plate. _______________________________________________________
|
|
|
16.
|
The
force vectors on a positively charged sphere are away from the sphere.
_________________________
|
|
|
17.
|
When
the net force on an oil drop in a Millikan apparatus is zero, the gravity downward cancels the
product of the mass and the electric field on the oil drop.
__________________________________________________
|
|
|
18.
|
Some
ferromagnetic materials are aluminum, nickel, calcium, and gadolinium.
______________________________
|
|
|
19.
|
The
formula relating magnetic force to the magnetic field, conductor length, current and angle between
the conductor and the magnetic field lines is  .
_________________________
|
|
|
20.
|
Light
must be a longitudinal wave since it can be polarized. _________________________
|
|
|
21.
|
Photoelasticity is the ability of a transparent material to rotate the plane of
polarization of transmitted light. _________________________
|
|
|
22.
|
Diffraction gratings provide much brighter interference patterns since more
light passes through them compared with double slits. _________________________
|
|
|
23.
|
When
white light passes through a diffraction grating, red light is deflected least.
_________________________
|
|
|
24.
|
Due
to their incredibly low frequencies, radio waves do not diffract.
_________________________
|
|
|
25.
|
The
speed of light is an absolute velocity in Newtonian mechanics.
_________________________
|
|
|
26.
|
As an
object is heated, it will produce all colours of the light spectrum.
_________________________
|
|
|
27.
|
A
blackbody cannot emit ultraviolet radiation. _________________________
|
|
|
28.
|
A
high temperatures, a black body will emit electrons. _________________________
|
|
|
29.
|
Heisenberg’s uncertainty principle states that we cannot know both the
position and the momentum of a particle at the same time. _________________________
|
|
|
30.
|
A
scintillation tube will only measure b radiation. _________________________
|
Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
31.
|
A
race car completes exactly 10 laps around an oval track. Which of the following pairs of quantities
concerning its motion would both have values of zero? a. | displacement,
average velocity | b. | average speed, average acceleration | c. | distance,
average speed | d. | average speed, average velocity | e. | displacement,
average speed | | |
|
|
|
32.
|
Which
of the following graphs depicts uniform motion?
a. | A and
B | d. | B and
D | b. | C and
D | e. | E
only | c. | A and
C | | | | |
|
|
|
33.
|
An
object is thrown vertically upward with a speed of 25 m/s. How much time passes before it comes back
down at 15 m/s? (Air resistance is negligible.) a. | 1.0 s | d. | 18 s | b. | 4.1 s | e. | 27 s | c. | 9.8 s | | | | |
|
|
|
34.
|
An
object is travelling due east when it experiences a uniform acceleration directed north. Its velocity
some time later a. | must be directed
north | b. | could be directed north | c. | must be directed
north-east | d. | could be directed east when the acceleration
ceases | e. | must be directed east when the acceleration
ceases | | |
|
|
|
35.
|
Two
masses, A and B, hang on opposite ends of a rope suspended over a pulley. The mass of A is greater
than the mass of B. If  represents the
force of tension exerted by the rope on mass A and  represents the
force of tension exerted by the rope on mass B, then which of the following statements concerning the
forces of tension is true?
|
|
|
36.
|
The
acceleration of an object sliding along a frictionless ramp that is inclined at an angle q
is a. | g
cosq | d. | g | b. | g sinq | e. | zero | c. | g tanq | | | | |
|
|
|
37.
|
A
fighter jet flies at 328 km/h in an arc of radius 235 m. How many “g’s” of
centripetal acceleration does the pilot experience? (1g = 9.8
m/s2)
|
|
|
38.
|
Which
of the following graphs best illustrates the relationship between a satellite’s orbital
radius ro and its orbital speed vo?
|
|
|
39.
|
Which
of the following graphs best illustrates the relationship between a satellite’s orbital speed
vo and its orbital radius ro?
|
|
|
40.
|
A
bullet with a mass of 28 g is fired from a 2.8-kg gun that is stationary, but free to recoil. After
the bullet is fired, the gun is observed to be moving at 1.4 m/s [left]. The velocity of the bullet
is a. | 140 m/s
[left] | d. | 71 m/s
[left] | b. | 140 m/s [right] | e. | 71 m/s | c. | 71 m/s
[right] | | | | |
|
|
|
41.
|
A
ball rolling down a hill doubles its speed but reduces its gravitational energy to one-fifth its
starting value. The factor by which its momentum changes is
|
|
|
42.
|
A
ball rolling down a hill doubles its momentum but reduces its gravitational energy to one-third its
starting value. The factor by which its kinetic energy changes is
|
|
|
43.
|
Two
objects strike a glancing blow. The diagram below shows the momenta of some of the objects are shown
before and after the collision.
Which vector best represents the momentum of object P after the
collision?
|
|
|
44.
|
Kepler’s constant for the Sun is CS = 3.4 ´ 1018
m3/s2. The average period of orbit for Earth is 365.26 d. The average radius of
Earth’s orbit is a. | 7.7 ´ 107 km | d. | 1.5 ´ 1011 m | b. | 3.4 ´ 109
m | e. | 5.8 ´ 1016
m | c. | 1.8 ´ 1010
m | | | | |
|
|
|
45.
|
Which
subatomic particles are electrically charged? a. | neutrons only | d. | electrons and neutrons | b. | electrons and
protons | e. | protons
only | c. | protons and
neutrons | | | | |
|
|
|
46.
|
Two
isolated spheres, A and B, are 2 m apart. Sphere A has charge q and sphere B has charge
2q. The electrostatic force on sphere A is a. | the same as on sphere B | d. | four times that on sphere B | b. | two times that
on sphere B | e. | not enough
information | c. | half that on sphere B | | | | |
|
|
|
47.
|
The
magnitude of the electric field between the plates of a parallel plate capacitor is 3.5 ´ 104
N/C. If the charge on each plate were to decrease by a factor of four, the magnitude of the electric
field would a. | increase by a
factor of four | d. | decrease by a
factor of four | b. | increase by a factor of sixteen | e. | not be affected | c. | decrease by a
factor of sixteen | | | | |
|
|
|
48.
|
Magnetic force is equal to
|
|
|
49.
|
When
considering a real-life situation of a travelling water wave, which of the following properties
decreases as the wave travels in one medium? a. | wavelength | d. | frequency | b. | speed | e. | period | c. | amplitude | | | | |
|
|
|
|
|
|
50.
|
The
diagram above shows two identical speakers arranged at ear level. They are emitting the same
frequency in phase. The speakers are 3.0 m apart and an observer stands 4.0 m directly in front of
one speaker at point X. The sound intensity will be least for the observer at X when the wavelength
of the sound is a. | 5.0
m | d. | 2.0
m | b. | 4.0
m | e. | 1.0
m | c. | 3.0
m | | | | |
|
|
|
51.
|
The
diagram above shows two identical speakers arranged at ear level. They are emitting the same
frequency in phase. The speakers are 3.0 m apart and an observer stands 4.0 m directly in front of
one speaker at point X. The sound intensity will be greatest for the observer at X when the
wavelength of the sound is a. | 1.0 m | d. | 4.0 m | b. | 2.0
m | e. | 5.0
m | c. | 3.0
m | | | | |
|
|
|
|
|
|
52.
|
The
diagram above shows a single slit with lines marking the direction to a point P in the diffraction
pattern generated. X and Y are the edges of the slit. The possible value for the path difference, PY
– PX, that places P at the first intensity minimum adjacent to the central maximum
is
|
|
|
53.
|
The
interference pattern created by monochromatic light in an air wedge is used to measure the thickness
of an object. Which of the following changes would cause the spacing between adjacent fringes to
increase? a. | Use a light
source with a higher frequency. | b. | Increase the thickness of the object being
measured. | c. | Use a light source with a longer
wavelength. | d. | Use a shorter air wedge. | e. | None of the
above. | | |
|
|
|
54.
|
Audio
CDs produce better sound quality than magnetic tapes or vinyl records because a. | There is very
little background distortion and noise. | b. | Each note reproduced has an unvaried
pitch. | c. | The dynamic range of CDs is far superior than either tape or
vinyl. | d. | There is no physical contact between the CD surface and the
reading head. | e. | All of the above. | | |
|
|
|
55.
|
Which
of the following is not a typical component of a modern communications transmitter? a. | modulator | b. | amplifier | c. | RF
oscillator | d. | demodulation detector | e. | All of these are
components of a transmitter. | | |
|
|
|
56.
|
A
typical radio receiver circuit consists of five components. Which of the following lists these
components in order from the time the signal is received to when it is converted to audible
sound? a. | RF
tuner/amplifier, antenna, demodulation detector, AF amplifier, loudspeaker | b. | antenna,
demodulation detector, RF tuner/amplifier, AF amplifier, loudspeaker | c. | antenna, RF
tuner/amplifier, demodulation detector, AF amplifier, loudspeaker | d. | antenna, AF
amplifier, demodulation detector, RF tuner/amplifier, loudspeaker | e. | loudspeaker, AF
amplifier, demodulation detector, RF tuner/amplifier, antenna | | |
|
|
|
57.
|
An
object is observed to be a length L with velocity v. Its proper length is given by the
formula
|
|
|
58.
|
The
relativistic momentum of an atomic particle of mass 1.62 ´ 10–27 kg moving at 0.92c
is a. | 1.14
´ 10–18
kg·m/s | d. | 3.81
´
10–27 kg·m/s | b. | 1.75 ´ 10–19
kg·m/s | e. | 5.84
´
10–28 kg·m/s | c. | 3.29 ´ 10–19 kg·m/s | | | | |
|
|
|
59.
|
In
the photoelectric effect, the work function is a. | the amount of energy required to release an
electron | b. | the same as the threshold frequency | c. | the amount of
kinetic energy possessed by the electron | d. | dependent on the frequency of light | e. | none of the
above | | |
|
|
|
60.
|
Which
of the following particles are fermions? a. | leptons | d. | a. and b. | b. | bosons | e. | a. and
c. | c. | quarks | | | | |
|
Completion
Complete each sentence or
statement.
|
|
|
61.
|
A toy
car travels once around a circular track of radius 65 cm in a time of 2.8 s. The car’s average
speed is ____________________ and the value of its average velocity is
____________________.
|
|
|
62.
|
A
plane must fly due south to its destination. The pilot finds that he must contend with a wind blowing
from the west so he points the plane in a ____________________ direction.
|
|
|
63.
|
When
the net force acting on an object is nonzero, the object is certain to
____________________.
|
|
|
64.
|
A car
travelling around a corner at a constant speed is considered to be a(n) ____________________ frame of
reference.
|
|
|
65.
|
Gravitational potential energy is due to ____________________ above Earth’s
surface.
|
|
|
66.
|
The
law of conservation of energy applies to a(n) ____________________ system.
|
|
|
67.
|
Friction causes kinetic energy to transform into ____________________
energy.
|
|
|
68.
|
The
model which suggests that the planets revolve around the Sun is called the ____________________ model
of the solar system.
|
|
|
69.
|
The
Schwartzschild radius is the distance from the centre of the singularity to the
_________________________.
|
|
|
70.
|
The
law of ____________________ states that opposite charges attract one another, similar charges repel
one another, and charged objects attract some neutral objects.
|
|
|
71.
|
You
bring a negatively charged rod close to a neutral electroscope. You touch the electroscope with your
finger and some electrons move from the electroscope to your body. You take your finger away leaving
the electroscope with a positive charge. This is an example of
_________________________.
|
|
|
72.
|
____________________ states that the force between two point charges is inversely
proportional to the square of the distance between the charges and directly proportional to the
product of the charges.
|
|
|
73.
|
All
subatomic particles have charges that are integral ____________________ of e.
|
|
|
74.
|
As
charge +q1 moves away from an identical charge +q2, the kinetic
energy of charge q1 ____________________
|
|
|
75.
|
Earth
has two major radiation belts, the ______________________________ approximately 25 500 km above the
surface of Earth and the ___________________________ approximately 12 500 km above the surface of
Earth.
|
|
|
76.
|
Complete the following equation: 
|
|
|
77.
|
Complete the following equation:  .
|
|
|
78.
|
Faraday discovered that the current produced by a magnet when plunged into a solenoid
is caused by a ____________________ magnetic field.
|
|
|
79.
|
When
the wavelength of a wave ____________________, the amount of noticeable diffraction
increases.
|
|
|
80.
|
When
generating a two-point source interference pattern in a ripple tank, increasing the frequency of the
sources causes the wavelength to ____________________.
|
|
|
81.
|
____________________ interference occurs when the resultant waveform has a larger
amplitude than each individual wave.
|
|
|
82.
|
The
sharpness of shadows supports the property of light referred to as
______________________________.
|
|
|
83.
|
Red
light bends least. According to Snell’s law, the wavelength of red light is ____________________
that of blue light.
|
|
|
84.
|
For
two polarizing filters to absorb all of the light passing through them, their polarizing axes must be
placed ____________________ to each other.
|
|
|
85.
|
Edwin
Land created the first synthetic material used to polarize light which he called
____________________.
|
|
|
86.
|
For
light transmitted through thin films, ____________________ interference occurs when the thickness of
the film is nearly zero.
|
|
|
87.
|
A
common problem with eyeglasses called ____________________ can be minimized by coating the lenses
with a thin film.
|
|
|
88.
|
Most
light created by conventional sources is said to be ____________________, since the emission occurs
in random phases.
|
|
|
89.
|
A(n)
_________________________ frame of reference is a frame of reference that is accelerating relative to
an inertial frame.
|
|
|
90.
|
The
changing from one element into a different element by radioactive decay is called
____________________.
|
Matching
|
|
|
Match the calculation with the quantity it determines. a. | velocity | d. | displacement | b. | acceleration | e. | change in velocity | c. | jerk | | | | |
|
|
|
91.
|
the
slope of a velocity-time graph
|
|
|
92.
|
the
slope of an acceleration-time graph
|
|
|
93.
|
the
slope of a position-time graph
|
|
|
94.
|
the
area under an acceleration-time graph
|
|
|
95.
|
the
area under a velocity-time graph
|
|
|
Match each item with the correct statement below. a. | electric
potential | d. | electric
potential energy | b. | electric field intensity | e. | kinetic energy | c. | elementary
charge | | | | |
|
|
|
96.
|
electric force per unit positive charge
|
|
|
97.
|
energy that increases as the distance between two charges of the same sign
increases
|
|
|
98.
|
energy a charge has when positioned a small distance from another charge of the same
sign; decreases as the distance between the charges increases
|
|
|
99.
|
charge on an electron
|
|
|
100.
|
work
necessary to move a positive charge from rest at infinity to rest at a point
|
|
|
Match the definition or phrase below with the best available word, equation, or
phrase. a. | first excitation
energy | f. | ionization
energy | b. | phosphorescence | g. | light as both a wave and a particle | c. | continuous
spectrum | h. | Coulomb’s
law | d. | de Broglie
wavelength | i. | fluorescence | e. | ground state | j. | emission spectrum | | | | |
|
|
|
101.
|
wave-particle duality
|
|
|
102.
|
|
|
|
103.
|
|
|
|
104.
|
light
of all wavelengths
|
|
|
105.
|
light
with characteristic frequencies
|
|
|
106.
|
lowest energy state of an atom
|
|
|
107.
|
smallest amount of energy that can be absorbed
|
|
|
108.
|
energy required to remove an electron from an atom
|
|
|
109.
|
when
a source of light is removed, this light stops
|
|
|
110.
|
when
a source of light is removed, this light will continue
|
|
|
Match the following symbol or description to the definitions
below. a. | g | f. | | b. | holds the nucleus together | g. | pair production | c. | becquerel | h. | | d. | energy to separate protons and
neutrons | i. | holds electrons
inside nucleons | e. | | j. | | | | | |
|
|
|
111.
|
a
particle
|
|
|
112.
|
b
particle
|
|
|
113.
|
g
ray
|
|
|
114.
|
positron
|
|
|
115.
|
neutrino
|
|
|
116.
|
strong nuclear force
|
|
|
117.
|
weak
nuclear force
|
|
|
118.
|
binding energy
|
|
|
119.
|
photon creating an electron and a positron
|
|
|
120.
|
SI
unit for radioactivity
|
Short Answer
|
|
|
121.
|
Describe a situation where an object is accelerating but its velocity is
zero.
|
|
|
122.
|
Why
does the centripetal force not appear on any free-body diagrams.
|
|
|
123.
|
Give
two examples of how the high kinetic energy of motor vehicles has changed our society.
|
|
|
124.
|
Will
a spring-operated bathroom scale (that gives a reading in kilograms) give the correct mass reading on
the Moon?
|
|
|
125.
|
A
12-kg block sliding across a smooth table at 1.9 m/s hits a spring bumper with a force constant of
490 N/m. What is the maximum compression of the spring?
|
|
|
126.
|
Many
vehicles produced today are designed with “crumple zones.” How does this feature protect
the occupants of the car?
|
|
|
127.
|
Give
two observations that would enable you to conclude that the bounce of a superball is not a completely
elastic collision.
|
|
|
128.
|
If
the gravitational field strength at the surface of Venus is g, at what distance from the
surface of Venus will it be 0.25g? State your answer in terms of the radius of
Venus.
|
|
|
129.
|
Any
comet that passes Earth is usually only visible for a short time (a few weeks). Why does it take so
long (decades or centuries) before we see them again?
|
|
|
130.
|
Why
can we not have a satellite in orbit 15 km above Earth’s surface?
|
|
|
131.
|
How
does plastic wrap stick to a bowl?
|
|
|
132.
|
What
is meant by “absolute value of net current”?
|
|
|
133.
|
An
astute student performs Young’s double slit experiment in glass and observes an interference
pattern. The student then performs an identical experiment in air using the same equipment and
distances. What changes would be noticed in the interference pattern?
|
|
|
134.
|
You
wish to determine the concentration of a certain solution that exhibits optical activity. How would
you do this?
|
|
|
135.
|
Using
monochromatic green light, the moveable mirror on an interferometer is moved through a distance of
1.2 mm and the number of fringes that move past the reference point are counted. The light is now
switched to monochromatic red light that has a wavelength of one and one-half times that of the green
light. How far would the moveable mirror need to be moved to measure the same number of interference
fringes?
|
|
|
136.
|
A
plane is dropping medical supplies to a village. Describe the path of medical supplies as it appears
to the person “dropping” the supplies.
|
|
|
137.
|
Why
is it necessary to place a specimen in a vacuum if it is to be viewed by an electron
microscope?
|
|
|
138.
|
How
are the lines of an emission spectrum related to an absorption spectrum?
|
|
|
139.
|
Complete the nuclear equation of the b– decay of  .
|
|
|
140.
|
Complete the following nuclear equation:  .
|
Problem
|
|
|
141.
|
A
ball is thrown vertically upward from a window that is 3.6 m above the ground. Its initial speed is
2.8 m/s.
(a) With what speed does the ball hit the
ground?
(b) How long after the first ball is thrown should a second ball be
simply dropped from the same window so that both balls hit the ground at the same time?
|
|
|
142.
|
An
object is pushed along a rough horizontal surface and released. It slides for 10.0 s before coming to
rest and travels a distance of 20.0 cm during the last 1.0 s of its slide. Assuming the acceleration
to be uniform throughout
(a) How fast was the object travelling upon
release?
(b) How fast was the object travelling when it reached the halfway
position in its slide?
|
|
|
143.
|
A
force of 3.5 N [60°E of N] and a force of 2.8 N [40°W of S] act on
the same object. Find the net force acting on the object using (a) a trigonometric method and (b) a
component method.
|
|
|
144.
|
A
rope tow is used to move snow skiers along a 40º incline. The tow is designed to simultaneously
carry 50 skiers of average mass 80.0 kg. The skiers simply stand on their skis and hold onto the rope
as it pulls them up the hill. The coefficient of kinetic friction between the skis and snow is
0.12.
(a) What total force must the winch at the top of the hill exert to
pull a full complement of skiers up the hill at a constant speed? Provide an appropriate free-body
diagram.
(b) If the hill is 800.0 m long and a skier starts from rest at the
top and heads straight down with maximum acceleration for the first 3.0 s, and then continues at a
constant speed until she reaches the bottom, how long will the entire descent take? Include a new
free-body diagram.
|
|
|
145.
|
A 2.0
´
102-g mass is tied on the end of a 1.6 m long string and whirled around in a circle that
describes a vertical plane.
(a) What is the minimum frequency of rotation required to keep
the mass moving in a circle?
(b) Calculate the maximum tension in the string at
this frequency.
|
|
|
146.
|
A
small explosive charge is placed in a rubber block resting on a smooth surface. When the charge is
detonated, the block breaks into three pieces. A 200-g piece travels at 1.4 m/s, and a 300-g piece
travels at 0.90 m/s. The third piece flies off at a speed of 1.8 m/s. If the angle between the first
two pieces is 80º, calculate the mass and direction of the third piece. Assume two significant
digits for each value.
|
|
|
147.
|
Two
carts of mass 12 kg and 15 kg move toward each other with speeds of 2.3 m/s and 1.5 m/s respectively.
If the collision between them is completely inelastic, calculate the velocity of the 15-kg cart after
the collision.
|
|
|
148.
|
Given
that Fc = Fg for a satellite, show that the radius of orbit for
an Earth satellite is  .
|
|
|
149.
|
What
is the Schwartzschild radius of a black hole of mass 4.7 ´ 1034 kg?
|
|
|
150.
|
Point
charges W, X, Y, and Z each have the same magnitude charge of  .
Two of the charges are positive as shown and two are negative. The corners of the square are 10.0 cm
long. Calculate the net force on each of the point charges. Draw vector diagrams for each point
charge.
|
|
|
151.
|
A
5.00-m straight conductor carries a current of 15.0 A through a uniform magnetic field. The magnitude
of the force on the conductor is 0.67 N. The angle between the current and the magnetic field is
50.0°. What is the magnitude of the magnetic field?
|
|
|
152.
|
The
thickness of a human hair is to be measured using the interference pattern produced by an air wedge.
Red light with a wavelength of 638 nm is used on an air wedge that is 25.0 cm long. If 10 bright
fringes are counted across 1.06 cm in the air wedge, what is the thickness of the hair?
|
|
|
153.
|
Two
30 m long spaceships are flying toward each other. One ship is travelling at 0.30c and the
other at 0.42c. What do each of the pilots observe the others ship’s length to
be?
|
|
|
154.
|
Calculate the total kinetic energy, in electron volts, and the speed of a b particle
released from a carbon-14 decay:  . Assume that
only the electron moves and receives the total energy released. (The atomic mass of nitrogen-14 is
14.003074u.)
|
Essay
|
|
|
155.
|
Relief packages are dropped from airplanes to the ground below. What considerations
must be taken into account in order for the packages to hit their targets? Explain how a pilot can
determine the correct timing for the release of the packages.
|
|
|
156.
|
Safety during sporting events becomes increasingly important as people and machines
get faster and push the limits of human accomplishment. Choose a sporting event and, referring to
concepts covered in this unit, explain how safety equipment minimizes risk of injury and how it has
affected the sport.
|
|
|
157.
|
Satellite technology has made the use of wireless devices such as cell phones
practical for many families. Do these devices make our world better?
|
|
|
158.
|
(a)
Briefly explain how J.J. Thomson used his cathode-ray tube experiment to determine that cathode rays
consisted of negative particles.
(b) Briefly explain how J.J. Thomson used his
cathode-ray tube experiment to determine the speed of the electron.
|
|
|
159.
|
(a)
When a car moves up to a traffic light, it seems to “magically” turn green a short time
later. Explain this apparent “magic.”
(b) What two
factors control the capacity of an inductor?
|
|
|
160.
|
Explain how the cruise control works on an automobile.
|
|
|
161.
|
A
friend asks you to explain why a soap bubble reflects various colours from the surface even though
the light source is white. How would you explain this phenomenon?
|
|
|
162.
|
Explain the effects and observations that a person may experience if the theoretical
speed of light was limited to 100 km/h. Trace that persons movements through a typical day (e.g.,
driving to work or school).
|
|
|
163.
|
You
have been asked by the steel industry to design a new temperature measuring device that uses the
photoelectric effect. Describe how you could design such a device, and explain how it would
work.
|
|
|
164.
|
A
neutron will decay into a proton through b emission. Using the theories of quarks and a Feynman diagram, explain
how this occurs. Explain why observing a proton to neutron transmutation would be
unlikely.
|