Chapt. 17 Waves I: General Waves and Waves on a String 153
c) A point of maximum amplitude in standing waves.
d) That which proceeds a node.
e) That which follows a node.
017 qmult 00600 1 4 3 easy deducto-memory: antinodes and humps
14. In the 3rd harmon
152 Chapt. 17 Waves I: General Waves and Waves on a String
6. The DISTANCE along a wave pattern before the shape begins to repeat is called the:
a) frequency.
b) amplitude.
c) wavelength.
d) period.
e) phase velocity.
017 qmult 00112 1 1 4 easy memory: wa
Chapt. 5 Newtons Laws and Dynamics I 53
a) The GROUND FORCE reaches out across space and pushes upward on each bit of your
body independently of every other bit. The ground force is also a FIELD FORCE.
b) The ground exerts a force on the soles of your fee
Chapt. 17 Waves I: General Waves and Waves on a String
Multiple-Choice Problems
017 qmult 00005 1 4 5 easy deducto-memory: waves
Extra keywords: physci KB-176
1. Lets play Jeopardy! For $100, the answer is: It is a periodic oscillation of something.
What
Chapt. 33 Alternating Current or AC 253
a) Draw a diagram. In the main circuit branch, there is a current I . In the resistor branch,
there is a current I1 . In the inductor branch, there is a current I2 . In the capacitor branch,
there is a current I3 .
52 Chapt. 5 Newtons Laws and Dynamics I
the object that start at two points used as pivot points and that go in the direction through
the object that was downward when each of the points was the pivot point. The method fails
if the two pivot points and th
150 Chapt. 16 Oscillations and Simple Harmonic Motion
are from the left and some are from the right. The block sits on a level frictionless oor. The
springs are ideal. Each spring has a force constant ki and equilibrium position xi for the center
of the b
252 Chapt. 33 Alternating Current or AC
PR
(ii) 0.50; 5.0 105 .
E
e) (i) P RE 2 (ii) 0.50; 5.0 105 .
c) (i)
d) (i)
PR
(ii) 0.42; 4.2 105 .
E
Full-Answer Problems
033 qfull 00540 2 3 0 moderate math: driven semi-parallel RLC circuit
1. What can be called a
Chapt. 5 Newtons Laws and Dynamics I 51
a) outside of the object.
b) neither inside nor outside the object.
c) at the point about which the object is symmetric in 2 of the dimensions, but not in the
3rd.
d) at the point about which the object is symmetric
Chapt. 16 Oscillations and Simple Harmonic Motion 149
Full-Answer Problems
016 qfull 00310 1 3 0 easy math: SHO period, frequency,
1. There is a simple harmonic oscillator (SHO) that takes a time t = 0.75 s before it begins to
repeat. What are its (a) pe
Chapt. 33 Alternating Current or AC 251
what is the non-complex number impedance (which is called the [non-complex] inductive
reactance) and the phase angle for current?
a) L and 90 .
e) L and 90 .
b) L/ and 90 .
c) 1/(L) and 90 .
d) L and 90 .
033 qmult
50 Chapt. 5 Newtons Laws and Dynamics I
a) they cancel out in threesomes.
b) they are all zero.
c) we just ignore them.
d) they cancel out pairwise.
e) the external force cancels them out.
005 qmult 00560 1 4 5 easy deducto-memory: center of mass in Fnet=
148 Chapt. 16 Oscillations and Simple Harmonic Motion
b) it has BEEN thought of before.
c) the hypnotic pendulum swinging motion would induce even deeper slumber in your lessamusing, clockwatching students.
d) even a bad idea can make money. All that is n
250 Chapt. 33 Alternating Current or AC
a)
I0
;
V0
b)
V0
;
I0
c)
V0
; t
I0
d)
V0
;
I0
e)
I0
;
V0
033 qmult 00240 1 1 2 easy memory: AC power, phase angle
12. For a circuit branch (which could be a device or circuit system), you have potential drop/rise
ac
Chapt. 5 Newtons Laws and Dynamics I 49
005 qmult 00534 1 5 1 easy memory: Newtons 2nd law class mantra 1
13. From here on in this course, a key thing to remember (to recite to yourself) when faced with
any force problem is that Newtons 2nd law (Fnet = ma
Chapt. 33 Alternating Current or AC 249
033 qmult 00140 1 1 4 easy memory: unit of frequency
5. The MKS unprexed unit of frequency is the:
a) kilovolt (kV).
e) kilohertz (kHz).
b) volt (V)
c) revolution per minute (RPM).
d) hertz (Hz).
033 qmult 00150 1 1
48 Chapt. 5 Newtons Laws and Dynamics I
frames not accelerating with respect to the primary set are also part of the special class. We
actually can observationally determine the primary set by measurements of distant objects in the
universe and/or by meas
Chapt. 16 Oscillations and Simple Harmonic Motion 147
where is the length of the pendulum and g is the gravitational acceleration. A ducial
pendulum period (i.e., period that can be used as a standard for reference or quick estimation)
is obtained for a p
Chapt. 33 Alternating Current or AC
Multiple-Choice Problems
033 qmult 00100 1 1 3 easy memory: AC denition 1
1. Alternating current or AC means that current and potential vary about a mean value (usually
zero) and usually (but not always)
a) trapezoidall
Chapt. 5 Newtons Laws and Dynamics I
Multiple-Choice Problems
005 qmult 00100 1 4 2 easy deducto-memory: dynamics dened 1
1. Lets play Jeopardy. For $100, the answer is: The branch of physics that explains motion and
acceleration in terms of forces and ma
146 Chapt. 16 Oscillations and Simple Harmonic Motion
5. Frequency (i.e., cycles per unit time) is give by:
a) f = P = .
b) f = 1/P 2 = /(2 )2 .
c) f = 1/P = /(2 ).
d) f = 1/P = (2 )/P 2 .
e) f = P = /(2 ).
016 qmult 00300 1 1 1 easy memory: SHO equation
Chapt. 32 Inductance and Inductors 247
d) Sketch I as a function of time.
031 qfull 00424 3 5 0 tough thinking: RL circuit discharge
Extra keywords: a sub-useful question maybe good for tests
5. You have a one-loop circuit with ONLY a resistor R and induc
Chapt. 16 Oscillations and Simple Harmonic Motion
Multiple-Choice Problems
016 qmult 00100 1 1 2 easy memory: linear force law, Hookes law
1. The linear force law (AKA linear restoring force law, spring force law, Hookes law, and simple
harmonic oscillato
46 Chapt. 4 Two- and Three-Dimensional Kinematics
acceleration and has magnitude ma. This pseudo or inertial force is sometimes called the
g-force and is specied as a force per unit mass in units of g . Thus circling with acceleration
0.05g is just like b
246 Chapt. 32 Inductance and Inductors
b) At what time (in numerals) does the current reach half its nal value (i.e., half its value at
time innity)?
032 qfull 00420 3 3 0 tough math: solving a DE for an RL circuit 1
3. Its about time you-all solved a die
144 Chapt. 15 Fluids
the water coming out of the primary. The volume of water V accumulated in the catchment
measures time: V0 V is the volume of water remaining in the primary.
a) Show that the dierential bit of water volume sent to the catchment is
dV =
Chapt. 4 Two- and Three-Dimensional Kinematics 45
a) The displacement vector r in polar coordinates is
r = rr ,
where r is the magnitude of r and r is unit vector pointing in the direction of r . Dierentiate
r with respect to time t to nd v using the prod
Chapt. 32 Inductance and Inductors 245
13. Consider an innite ladder inductor. There are two terminals A and B at the left: A is the
upper terminal; B is the lower terminal. From each terminal, a wire extends to innity in the
rightward direction. There ar
Chapt. 15 Fluids
143
d) What is the DIAMETER of the 2nd piston?
015 qfull 00740 2 5 0 mod thinking: Archimedes principle, Tasmanian devil
5. Weve all heard of Archimedes and King Hieron IIs crown. But modern scientists and
technologists are seldom called
44 Chapt. 4 Two- and Three-Dimensional Kinematics
8. Deep in the Amazonian jungle you wish to cross a river livid with piranha and crocodiles. Let
x be the coordinate ALONG the river and y the coordinate PERPENDICULAR to the
river. The river width is ymax