Physics 123 Homework Problems, Winter 2014
Section 1, Dallin Durfee
1-1. A very powerful vacuum cleaner has a hose [01]
cm in diameter. With no
nozzle on the hose, what is the weight of the heaviest brick it can lift? The atmospheric
pressure is 1.00 atm.
Angular Magnification
Looking in Mirror first
homework problem
Magnifying Glass
You buy a pair of generic reading glasses which
have an angular magnification of 1.5 for objects
which are near to the wearer. What is the focal
length of the lenses in the gl
2 PART EXAM
Physics 123 section 1
Winter 2014
DO NOT WRITE ON THIS EXAM
Instructor: Dallin S. Durfee
Exam 2, Feb 24 - 27
Allowed: One sheet of notes, pencils, scratch paper, calculator, ruler.
Foreign students may also use a Foreign to
English dictionary
2 PART EXAM
Physics 123 section 1
Winter 2014
DO NOT WRITE ON THIS EXAM
Instructor: Dallin S. Durfee
Exam 3, March 19 - 22
Allowed: One sheet of notes, pencils, scratch paper, calculator, ruler.
Foreign students may also use a Foreign to
English dictionar
Final Exam
146 Richards Building
Fri April 18 to Wed April 23
Open 9 a.m. to 10 p.m.
Last test handed out at 8 p.m.
Rate the Tutors!
http:/gardner.byu.edu/tas/tutorrating.php
Types of radioactive decay
Gamma
Beta (+,-, e.c.)
Alpha
Neutron emission
Fi
Exam 4
Final Exam
Announcements
Multiple choice (16 questions) no free
response
All problems directly from midterms and
practice exams new numbers, some new
names
Course Evaluations extra 0.5% on final
grade
Check that scores are recorded correctly!
R
Postulates of Quantum Mechanics
Every physically-realizable system is described by a
state function that contains all accessible physical
information about the system in that state
The probability of finding a system within the volume
dv at time t is equ
Extra credit video missing.
Instead . . . Science, Faith, and
the Nobel Prize
Read it at
http:/ps100.byu.edu/phillips%20forum%
20transcription.pdf
Listen at
http:/speeches.byu.edu/?act=viewitem&i
d=966
dsd2
Fission:
Heavy Elements can reduce
energy (i.e.
Exam 4
Today last regular day
Tomorrow (Saturday) is the late day
Your study guide is the homework!
Final Exam
All Finals week in the RB
Same format, same rules as midterms, but no
free response
- one page of notes
- bring a calculator, scratch paper, p
Total Energy of a system is E [Measured in Joules] (EXTENSIVE PROPERTY) and is the sum of the
below
o Thermal, kinetic, potential, mechanical, electric, magnetic, nuclear
o MICROSCOPIC forms of energy (Molecular/atomic level) called internal energy [U],
Louis de Broglie
If light, which we
thought of as a
wave, behaves as
a particle, then
maybe things we
think of as
particles behave
as waves
photo from http:/www.aip.org/history/heisenberg/p08.htm
Energy/Frequency and
Momentum/Wavelength Relations for a
Ph
Blackbody Radiation
Max Planck, Plancks constant
Max Karl Ernst Ludwig Planck
Found an empirical
formula which fit the
measured blackbody
curve
Looked for way to
derive this empirical
formula
Photo from http:/www-groups.dcs.st-and.ac.uk/~history/PictDispl
Test 2
Started Today
Ends Wednesday Feb 26
Late day Thursday Feb 27
16 Multiple Choice
4 Free Response
Give yourself plenty of time!
Hot air balloon problem 10.4
Gondola, passengers, deflated balloon have
mass m. Inflated balloon has volume V. Air
out
Why dont I see an
interference pattern
From two light bulbs?
Coherence
(temporal and spatial)
Polarization
Interference of BEC
Phase Shift on Reflection of Light
1.0
Low n to high n
0.5
4
2
2
4
180 degree
phase shift
0.5
1.0
1.0
0.5
High n to low n
4
2
2
Water Waves
Water Waves
Interference.
A single source
Interference.
Two sources
If two people walk toward a point and both start on
the same foot-10 steps
y
11 steps
d
At the point where they meet they are out of
stepone is on the right foot and the
other
Diffraction from a Single Slit
Thought Question
Consider a single slit diffraction pattern. At the first
dark fringe above the middle bright fringe, what is
the phase difference between the contribution to the
field from the topmost and bottommost edges o
Exam 3
Wed-Fri (Saturday late day)
Bring a ruler
Correct CID!
Stapled neatly
Finding f from R, mirror vs lens
(reflector in LED flashlight)
Sign Conventions (p, q, f, R, M)
Virtual/Real, Upright/Inverted
Near- and farsighted (also like
20.3)
Light diffr
Where does
2
E=mc
come from?
Where does
2
E=mc
come from?
Where does
2
E=mc
come from?
Hydrogen atoms consist of one electron which
is bound to a proton by electromagnetic
forces. If I very carefully weigh a hydrogen
atom, what will I get?
A : The mass of
Lorentz transform
The primed frame moves with velocity v in
the x direction with respect to the fixed
reference frame. The reference frames
coincide at t=t'=0.
Galilean Transformations (which
are wrong)
The Lorentz Transformations
x' ( x vt)
y' y
z' z
t '
Pay close attention . . . because
Galilean Relativity
Galilean Relativity
I drive past a baseball field traveling north at 25
MPH. A player throws the ball south at a
speed (relative to the ground) of 70 MPH.
What is the speed of the ball in my inertial
r
Chapter 5:
Mass and Energy Analysis of Control Volumes
Topics:
A. Conservation of Mass
B. Energy of a Flowing Fluid
C. Energy Analysis of Steady-Flow Systems
D. Steady-Flow Engineering Devices
E. Energy Analysis of Unsteady-Flow Processes
Sections to Read
Chapter 1:
Introduction and Basic Concepts
Topics:
A. Introduction
B. Units
C. Basic Definitions
D. Temperature
E. Pressure
Sections to Read in the Textbook: 1.1 1.11
ME EN 2300 / CH EN 2300 Spring 2015, Department of Mechanical Engineering, University of
ME 2020/2080 Spring 15 - Prob. sets 13A S& 13B
13B-1
13A-1
Partial ans: aA = 800 J m/s2
13B-2 For a wheel as shown in the figure of above problem but
with a radius of 2 ft, that is rolling without slipping, determine the
acceleration of points C and D. fo
ME 2020/2080 Spring 15 - Prob. sets 12A S& 12B
12A-3 Use relative velocity
12A-1
Ans VB = 17.42 i 5.23 j
12B-1
Use instantaneous Center of zero velocity to solve problem 12A-3
12 B-2
12A-2
Ans.
|VC|
= 8.37 m/s
12B-3
Partial ans. 0.75 rad /s
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Michael Bowcutt (U0700573)
Shang-Yen Yang (U0763680)
MEMO
EARTHQUAKE MOTION AND VIBRATION
Earthquake motion is simply the movement of the earths surface. Put into more technical terms,
however, the plates of rock that make up the Earths surface build up e
ME 2020/2080 Spring 15 - Prob. sets 15A &15B
!5A-3 continued
15A-1
15B-1
15A-2
15B-2
15B-3
15A-3
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ME 2020/2080 Spring 15 - Prob. sets 11B & 11C
11C-1
11B-1
Partial ans. VA = - 4 j m/s, aB = - 64 i m/s2
11B-2
3
11C-2
Ans.
= 19.25
, = -204 rad/s2
11B-3
Ans -r
11C-3
11C-4
Partial ans.
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Horizontal Bars:
Equals:
Weight of the Gate:
Sum of Inertias:
Ybar:
806.48 lbs
6.063376
Plus every .5 ft a
lb*in^2 For a 6x4 beam (we use
Plus
Picket. = 68 pickets:
this assumption based on the
2637.72 lbs
given Observations on the back
of the page (about