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Astr 2010 Problems in Planetary Astronomy. Thursday 11:10am – 12:05pm Sundquist Science Center B-107 Dr. Spencer Buckner www.apsu.edu/astronomy. Instructor Dr . Spencer Buckner. Office: SSC B – 326 Hours: MWF 10:15am – 12:15pm MWThF 2:30 – 4:30pm or by appointment

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Astr 2010 problems in planetary astronomy

Astr 2010Problems in Planetary Astronomy

  • Thursday 11:10am – 12:05pm

  • Sundquist Science Center B-107

  • Dr. Spencer Buckner

  • www.apsu.edu/astronomy


Instructor dr spencer buckner
InstructorDr. Spencer Buckner

Office: SSC B – 326

Hours: MWF 10:15am – 12:15pm MWThF 2:30 – 4:30pm or by appointment

Email: [email protected]

Phone: 221-6241


Textbook

21st Century Astronomy: The Solar System, 3rd Edition,by Hester, Burstein, Blumenthal, Greeley, Smith & Voss

Textbook

If you don’t have the book, don’t go buy it since it isn’t required. Mostly we will just use the problems in the back of the chapters


Grading
Grading

Exams…………45% 90 – 100…A

Homework…….30% 80 – 89…..B

Projects………..20% 70 – 79…..C

Participation…….5% 60 – 69…..D

<60……….F


Exams

  • A scientific calculator will be required for the exams

  • Exams


    Homework
    Homework exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    Homework will be assigned from the Student Questions at the back of each chapter in the 21st Century Astronomy textbook. Additional problems from other sources will also be assigned to supplement the back-of-chapter questions. They will be due at the beginning of the next class meeting.

    First Homework set is due next week.

    Chapter 1 # 24, 26, 27, 31, 34, 35 & 37

    Solutions to the homework will be posted in the class D2L shell a day or two after they are turned in.


    Project
    Project exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    There will be two projects assigned during the semester. The first project will be due October 18. The second project will be due at the final exam period: Monday December 10 @ 10:30am. In addition to a written report, you will make a short (10-15 minute) oral presentation on your project. Since there are only two of you, you will not work in a group.


    First project
    First Project exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    What is the annual cost of the light in this picture?


    Example problem
    Example Problem exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    Mars is currently 1.7924 AU from Earth and the speed of light is 299,792 kilometers per second. If you were trying to drive the Mars rover Opportunity, how long would it take for your driving command to reach the rover? Do you think you will be able to avoid the big rock in front of the rover or will you crash into it, destroying the multimillion dollar machine?


    How to work a problem
    How to work a problem exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    • Step 1: What are you trying to solve for?

    • Step 2: What information are you given?

    • Step 3: What equation(s) do you need to solve the problem?

    • Step 4: Plug in the numbers and solve the problem

    • Step 5: Check for reasonableness


    Answer the first two questions
    Answer the first two questions exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    • Step 1: What are you trying to solve for? Light travel time from Earth to Mars.

    • Step 2: What information are you given? Speed of light (299,792 kilometers/second) and distance from Earth to Mars ( 1.7924 AU)


    Step 3 what equation s do you need
    Step 3: what equation(s) do you need? exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    Look for example problems in the chapter, in the appendix, in other textbooks or online.

    For this problem, look on the equations sheet. The average velocity is the distance divided by the time

    So the time is the distance divided by the velocity


    Unit conversions
    Unit Conversions exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    Distance was given in AU and velocity was in kilometers per second. Consistent units are needed throughout. Convert distances to meters and velocities to meters per second

    A word about significant figures


    Step 4 plug in numbers and solve
    Step 4: Plug in numbers and solve exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    d = 2.6813946x1011 m

    v = 2.99792x108m/s


    Step 5 check for reasonableness
    Step 5: check for reasonableness exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    Is this reasonable? How do I know if is reasonable? Is the rover going to crash into that big rock?


    An example for you
    An Example for You exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    The Voyager 1 spacecraft, launched on September 5, 1977, the most distant manmade object, is currently located 121.57AU from Earth. If the velocity since launch has been constant (it hasn’t but we will assume it has for this problem) determine how long it will take to reach Alpha Centauri, 4.36 lightyears away?


    Example for you solution
    Example for You Solution exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    • What are you trying to find? Travel time to Alpha Centauri at Voyager 1’s average speed

    • What information is given?Current distance to Voyager 1 is 121.57 AUTime since Voyager 1 launch is 6 days less than 35 yearsDistance to Alpha Centauri is 4.36 ly

    • What equation is needed?


    First find speed of voyager
    First find speed of Voyager exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    The unit conversions AU to meters and years to seconds can be done directly in the calculation. The answer will come out in meters per second.

    Since this is an intermediate step, carry as many digits as your calculator gives you


    Next find travel time to alpha centauri
    Next find travel time to Alpha Centauri exams will be entirely problems similar to the homework problems. A formula sheet will be given out with the exam. Tentative exam dates are

    Again, unit conversion lightyears to meters can be done directly in the calculation.

    Convert this to years to check for “reasonableness”

    That’s a long time!!!


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