practice-midterm

practice-midterm - Instructions Before you do anything...

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Unformatted text preview: Instructions Before you do anything else, check to see that your exam has all 7 numbered pages. If it does not, raise your hand and ask for a new exam. This exam will be computer-graded. You must use a num- ber 2 pencil to fill out the bubble sheet; if you do not have a pencil, borrow one from the proctors. On the bubble sheet you must fill in one of the small circles in each column where you make an entry . The computer cannot read your ordinary writing. You must fill in the following items: Your name, as it appears on your ID card. Your student ID number in the STUDENT # columns. The exam number (which is handwritten on the top right of this sheet) in the CODE columns. You can leave the other columns blank. Now answer the questions and fill in your answers on the bubble sheet. There are 30 questions, and you have 60 min- utes. For each question, select the single best answer from among the choices listed; giving more than one answer will be marked wrong. Note that in some questions all of the choices may be true statements, but only one will properly answer the question. If you are unsure, it is best to guess an answer because a wrong answer is no worse than no answer. Raise your hand if you have any questions. Print and sign your name on this cover sheet and hand it in with your bubble sheet when you are done. Have your photo ID ready to show the proctors. You may keep the questions. Your Exam Number: Physics 109: Astronomy and Cosmology PRACTICE MIDTERM EXAM February 26, 2010 Name: ID OK? Signature: 1 Angular vs. actual size (small-angle formula): D = d 206265 arcsec Keplers Third Law, with M in Solar masses, a in AU, and P in years: P 2 = a 3 M Keplers Third Law, with M in Earth masses, a in km, and P in seconds: P 2 = 10- 4 a 3 M Newtons Second Law of Motion: F = ma Newtons Law of Gravity: F = Gm 1 m 2 r 2 Wiens Law: peak = . 0029 m K T Stefan-Boltzmann Law: F = T 4 = 5 . 67 10- 8 W m- 2 K- 4 Temperatures: T F = 9 5 T C + 32 T C = 5 9 ( T F- 32) T K = T C + 273 Doppler effect: = v c 2 1. Suppose you are an astronaut taking a space walk to fix your spacecraft with a hammer. Unfortunately, your life-line breaks and the jets on your backpack are out of fuel! How could you return safely to your spacecraft? a) Turn on your helmet propeller and fly back. b) Fling your arms around in circles. c) Roll your body into as small a ball as possible. d) Throw your hammer away from the space ship. e) There is no way to return. You will die. 2. If the Earth were four times its current distance from the Sun, the time it would take to complete one orbit of the Sun would be a) 8 times longer....
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practice-midterm - Instructions Before you do anything...

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