______________________________
ASTR 1110001
Last name
First name
Dr. Hornstein
Spring 2008
_____________________________
Student Number
Version 1111
FIRST EXAM
8 Feb 2008 Closed books, no calculators, phones, etc. You may use one sheet
(8.5" x 11") of handwritten notes. Strictly individual effort, 45 minutes maximum. DO NOT USE
YOUR PHONE/IPOD/ETC FOR ANY REASON DURING THE TEST. Write your name and
student ID on this page and on the essay on the last page. Also, write and BUBBLE in your name
and student ID on the scantron sheet using a #2 pencil.
Enter the test form version (number underlined above) on the top left of the scantron sheet.
110points total.
Since the scantron forms will not be returned, you may want to record your
answers on this test. You WILL get this copy back. Solutions will be posted on CULearn this
evening. Monday's class will have clicker questions based on the concepts behind some of the
harder questions.
TRUE/FALSE.
Mark (a) T, or (b) F on scantron sheet based on each statement. [2 pts each]
1)Scientific theories can never be proven true beyond all doubt.
Answer: True False
2)At noon on the summer solstice, the Sun is at your zenith as long as you are in the northern
hemisphere.
Answer: True False
3)You can find the tilt of the Earth's axis by measuring the angle between your horizon and the
North Star.
Answer: True False
4)If the Earth was tilted by more than 23.5o, our seasons would be different than they are now.
Answer: True False
5)Order of magnitude astronomy refers to the concept that when dealing with very large numbers
we often only care if we
have the right units.
Answer: True False
MULTIPLE CHOICE.
Mark scantron with the choice that BEST completes the statement or
answers the question. [3 pts
each]
6)Suppose an asteroid orbits the Sun on a highly eccentric orbit with an average (semimajor
axis) distance of 1 AU. How
long does the asteroid take to complete each orbit, and how do we know?
A)Each orbit should take much longer than 1 year, because the eccentricity is so large.
B)1 year, which we know from Kepler's third law.
C)It depends on the eccentricity of the orbit, as described by Kepler's second law.
D)It depends on the eccentricity of the orbit, as described by Kepler's first law.
E)We have no way of knowing without knowing the size of the asteroid.
Answer: B
7)What is the ecliptic plane?
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 Spring '08
 HORNSTEIN
 Astronomy, North Star

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