Physics 310 – Cosmology Topics Covered: •Galaxies •The Universe Eric Carlson “Eric” “Professor Carlson” Olin 306 OH: Mon, Wed 11-12 or by appt. 758-4994 [email protected] Everyone Pick Up: •Syllabus •Student Info sheet – fill.
Download ReportTranscript Physics 310 – Cosmology Topics Covered: •Galaxies •The Universe Eric Carlson “Eric” “Professor Carlson” Olin 306 OH: Mon, Wed 11-12 or by appt. 758-4994 [email protected] Everyone Pick Up: •Syllabus •Student Info sheet – fill.
Physics 310 – Cosmology Topics Covered: •Galaxies •The Universe Eric Carlson “Eric” “Professor Carlson” Olin 306 OH: Mon, Wed 11-12 or by appt. 758-4994 [email protected] Everyone Pick Up: •Syllabus •Student Info sheet – fill it out •Intro Astronomy textbook •Sign it Out http://www.wfu.edu/~ecarlson/cosmo 1/13 Physics 310 – Cosmology Materials The Web •No text •Scientific Calculator •Ruler •Maple or similar program •Laptop Numerous materials can be found on the web for this course: •Reading assignments •Homework assignments •And solutions •Handouts: •Units •Syllabus •Math Review? •Lectures? http://www.wfu.edu/~ecarlson/modern Class attendance and seating •Attendance is expected every day •More than two unexcused absences Brentley Boyte Wes Matthews Ashley Carlton Claire McLellan count against your grade •If you have an advance excuse, Daniel David Colby Meador contact me (email) Danny Gallagher Don Nguyendac •If you are ill, call/e-mail me OR Katelyn Goetz Jack Owen bring Doctor’s note Steve Grosse •Starting Friday, everyone will sit in the Dillon Sanders Matt Howell same seat every day (your choice which Conner Stoldt Zach Lamport seat) Zach Vance Class Participation •Class participation is 10% of your grade •Ask lots of questions •Answer my questions •You will be called on Kyle Lipke Homework •About 1-3 problems per homework set •Due most class periods •Due almost every day at start of class •Getting help is encouraged Homework: •Ask a friend •Homework A by Wednesday •Ask me •Don’t copy – this is an honors code violation •Clarity counts Sample Problem •Keep track of units The gravitational acceleration of the Earth •Pay some attention to sig figs! is g = 9.81 m/s2. What is this in c/y? 7 c 3.156 10 s 2 g 9.81 m/s 1.033 c/y 8 2.998 10 m/s y Exams •1 test and a final •Midterm, possibly evening of March 3, 7-9 •If so, you get Friday March 5 off •Final April 30 at 2 PM •Honors code violations will be turned in to the honor council •Normally, penalty is 1-term suspension and an irreplaceable F in the course •Combination of worked problems and essay questions Dotted Red Line – Easily Derived from Other formulas Other colors – not on test Solid Red Line – Memorize this formula Dashed Red Line – Know how to use it Percentage Breakdown: Homework 40% Class Part. 10% Midterm 20% Final 30% Grades •Little if any curving •Do not allow extra credit Pandemic Plans •If there is a catastrophic closing of the university, we will attempt to continue the class: Grade Assigned 93% A 73% C 90% A- 70% C87% B+ 67% D+ 83% B 63% D 80% B- 60% D77% C+ <60% F Emergency contacts: Web page Email Cell: 407-6528 Astronomy involves such large and small quantities that SI units are often inconvenient 2 rad 360 Angles: 1 601 •A circle contains 2 rad or 360 degrees •An arc-minute (’) is 1/60 of a degree 1 601 •An arc-second (”) is 1/60 of an arc-minute 1 •A milli-arc-second (mas) is 10-3 arc-second 1 mas 1000 Distance: •The Angstrom is sometimes used for wavelength 1 Å = 10-10 m •The Astronomical Unit or AU is the (path averaged) 1 AU 1.496 1011 m distance between the Sun and the Earth •The light-year (ly) is the distance that light goes in a year 1 rad •Rarely used by real astronomers 1 pc AU 1 •The parsec (pc) is defined in terms of the AU 1 pc 3.086 1016 m 3.262 ly More Units keV = 103 eV MeV = 106 eV GeV = 109 eV Energy: 19 1 eV 1.602 10 J •Electron volts (eV) and metric multiples used for individual particles Time: •Days and Years are commonly used •And metric multiples of years 1 d = 86,400 s 1 y = 3.155 107 s ky = 103 y My = 106 y Gy = 109 y Temperature: 23 5 k 1.381 10 J/K 8.671 10 eV/K •Normally in Kelvin (K) B •Room temperature is 300 K •For high temperatures, we will often give kBT, 8 R 6.955 10 m where kB is Boltzmann’s constant. •Typical thermal energy is 1-3 times kBT. M 1.989 1030 kg Solar Units: •Stars and galaxies often compared to the Sun L 3.839 1026 W T 5777 K