Duke University
Department of Physics
Physics 105
Spring Term 2012
HOMEWORK 0
Available: January 11
Due: January 13, by email.
Problem 1: Introduce Yourself
By Friday, please send me an email ([email protected]
Duke University
Department of Physics
Physics 105
Spring Term 2012
HOMEWORK 2
Available: January 23
Due: February 3, at the beginning of class.
Reading: Ryden & Peterson Ch. 2.5, Ch. 3.1-3.3
Problem 1
Duke University
Department of Physics
Physics 105
Spring Term 2012
HOMEWORK 3
Available: February 6
Due: February 13, at the beginning of class.
Reading: Ryden & Peterson Ch. 5, except 5.5
Problem 1
R
FREQUENTLY ASKED QUESTIONS
February 20, 2012
Content Questions
How do you nd the center of mass?
The position of the center of mass of a system of N masses is given by
N mi ri
i=1 M , where ri are the
FREQUENTLY ASKED QUESTIONS
February 8, 2012
Content Questions
How do we use the formula I , where its all dierentials?
The formula for I , the specic intensity, is a distribution (sometimes called
a d
FREQUENTLY ASKED QUESTIONS
February 6, 2012
Content Questions
What is ? What is the dierence between and S ?
The quantity is known as the cross-section: its a measure of the probability that a photon
FREQUENTLY ASKED QUESTIONS
February 3, 2012
Content Questions
In the slide with the orbital distributions we saw, there were 5
columns, s, p, d, f. I thought the rst four L states were s,p,d,f.
Where
FREQUENTLY ASKED QUESTIONS
January 23, 2012
Administrative Questions
Can you do examples with numbers?
Ill typically not plug in numbers, and Ill also often skip standard algebra and
computation steps
FREQUENTLY ASKED QUESTIONS
January 18, 2012
Administrative Questions
Will there be a formula sheet for this class?
For the midterm and nal exams, you will make your own formula sheet.
Content Question
FREQUENTLY ASKED QUESTIONS
January 11, 2012
Administrative Questions
Will we be following the order of the text or skipping? Is there
any material we will cover outside of it?
I will follow approximat
Metric Conversions Worksheet 1. 0.75 kg to milligrams
2. 1500 millimeters to km
3. 2390 g to kg
4. 0.52 km to meters
5. 65 kg to g
6. 750 micrograms to g
7. 0.25 megameters to cm
8. 23.8 fg to kg
9. 2
Name: _ Hour: _ Date: _
Physics: Scientific Notation
Part A: Express each of the following in standard form. 1. 5.2 x 103 2. 9.65 x 104 3. 8.5 x 102 4. 2.71 x 104 5. 3.6 x 101 6. 6.452 x 102 7. 8.77 x
Scientific Notation and Unit Prefixes
Make the following conversions: 1) 3.4 liters to milliliters 6) 45 meters to centimeters
2)
876 millimeters to meters
7)
11.7 grams to kilograms
3)
78,999 milligr
Worksheet - Significant Figures Determine how many significant figures are in each of these numbers (56 & 87 are tricky!). 1) 2.03 16) 0.0224 31) 0.00471 46) 10.05 61) 5000000 2) 1.0 17) 3.000 32) 0.0
FREQUENTLY ASKED QUESTIONS
February 10, 2012
Content Questions
Im unclear on the variance: is the width of the distribution 2 or
?
The variance is 2 , and the standard deviation is , the square root o
FREQUENTLY ASKED QUESTIONS
February 13, 2012
Content Questions
What exactly does metallicity for a star mean?
Astronomers call any element with Z 3 a metal, whether or not it
really can exist in metal
Duke University
Department of Physics
Physics 105
Spring Term 2012
CLASS PROJECT INFORMATION
For this class, you will need to complete a project on an astrophysicsrelated topic of your choice. The cla
Thermal Radiation
All objects with temperatures above
absolute zero emit electromagnetic radiation
Also called
'Blackbody'
radiation:
it's what
you see
emitted
even with
no reflected
light
(black obje
Orbitals calculable with QM
Interaction of Light with Matter
Photons emitted or absorbed as
electrons jump levels
Happens
only at specific
energies
(frequencies)
for a given
substance
emission lines
a
Duke University
Department of Physics
Physics 105
Spring Term 2012
HOMEWORK 5
Available: February 20
Due: February 27, at the beginning of class.
Reading: Ryden & Peterson Ch. 7.1-7.2, Ch. 8
Problem 1
Duke University
Department of Physics
Physics 105
Spring Term 2012
HOMEWORK 4
Available: February 13
Due: February 20, at the beginning of class.
Reading: Ryden & Peterson Ch. 6
Problem 1
Ryden & Pete
Duke University
Department of Physics
Physics 105
Spring Term 2012
HOMEWORK 1
Available: January 11
Due: January 23, at the beginning of class.
Reading: All of Ch. 1 of Ryden & Peterson.
Problem 1
Ryd
FREQUENTLY ASKED QUESTIONS
February 15, 2012
Content Questions
How do you determine the mass of a planet if there are no moons?
If a planet has a natural moon, and assuming the mass of the moon m
is l
Graphing Motion Assessment
Use the graph of position versus time for a projectile (found on the next page) to complete the following:
1.
From the position vs. time graph on the next page: a. Find the
Graphing Motion Assessment for AP-B
Use the graph of position versus time for a projectile (found on the next page) to complete the following:
1.
From the position vs. time graph on the next page: a.
Magnetic Fields, Magnetic Forces, and Electromagnetic Induction Sample Problems
1. A wire 1 m long carries a current of 5 A. The wire is at right angles to a uniform magnetic field. The force on the w
Magnetic Fields and Forces Homework
1. A wire 0.10 m long carrying a current of 2 A is at right angles to a magnetic field. The force on the wire is 0.04 N. What is the strength of the magnetic field?