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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21st Century Astronomy: The Solar System, 3rd Edition,by Hester, Burstein, Blumenthal, Greeley, Smith & VossTextbook
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
Exams…………45% 90 – 100…A
Homework…….30% 80 – 89…..B
Projects………..20% 70 – 79…..C
Participation…….5% 60 – 69…..D
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.
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.
What is the annual cost of the light in this picture?
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?
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
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
d = 2.6813946x1011 m
v = 2.99792x108m/s
Is this reasonable? How do I know if is reasonable? Is the rover going to crash into that big rock?
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?
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
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!!!