Astronomy 210
Spring 2011
HOUR EXAM 2
1. DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO.
2. Write you name and all answers in your test booklet. Turn in everything: your
booklet, and the questions.
3. Show all of your work in the test booklet, and indica

Astronomy 210 Spring 2011
Homework Set #1: Solutions
1. SOHO and the Angular Speed of the Sun
(a) As the Earth orbits the sun the apparent position of the sun against the starry background
traces a closed path. Since the sun completes one orbit through th

Astronomy 210 Spring 2011
Homework Set #9: Solutions
1. How far can the eye see?
(a) [5 points] By denition, the dierence between any two magnitudes is related to the logarithm of the ratio of uxes:
5
F2
m2 m1 = log10
(1)
2
F1
In this problem we are inter

Astronomy 210 Spring 2011
Homework Set #5
Due in class: Friday, March 4 Total Points: 50
1. A Newly Discovered Planet. The NASA Kepler mission is an orbiting telescope designed to nd
planets around other stars (exoplanets) and right now is in the midst of

Astronomy 210 Spring 2011
Homework Set #5: Solutions
1. On the Lookout for the Asteroid of Doom.
(a) [5 points] A mass m with speed v has kinetic energy KE = 1/2 mv 2 , and if it is a distance
d from another mass M , the gravitational potential energy is

Astronomy 210 Spring 2011
Homework Set #6
Due in class: Friday, March 11 Total Points: 50 + 10 bonus
1. On the Lookout for the Asteroid of Doom. While most asteroids have orbits that conne them to
the asteroid belt between Mars and Jupiter, there are stil

Astronomy 210 Spring 2011
Homework Set #7: Solutions
1. A Transiting Exoplanet.
(a) [5 points] Since a3 = GM P 2 /(4 2 ), we have
a=
1/3
GM
4 2
P 2/3
(1)
It is ne to just use this formula, being careful with units.
A shortcut is to divide this result by t

Astronomy 210
Homework Set #7
Due in class: Friday, March 17
1. A Transiting Exoplanet. NASAs Kepler space telescope is designed to nd transiting planets, that
is, planets whose orbit planes happen to be seen edge-on, so that the planet passes in front of

Astronomy 210 Spring 2011
Homework Set #8: Solutions
1. The random walk of light inside the Sun.
(a) [5 points] At each step, each particle has an equal chance of going to the left or to the
right. This symmetry means that the entire collection (ensemble)

Astronomy 210
Homework Set #8
Due in class: Friday, April 8
Total Points: 50 + 5 bonus
1. The random walk of light inside the Sun. Photons in the Sun collide and scatter frequently o
of the charged particles (plasma) in the Sun. On average, travels only a

v=
ds
dt
p = mv
v = R
mm
F = G 1 22
r12
2 =
d
dt
=
=
c =
L = I
F = ma
E pot = G
4 2
d3
G ( m1 + m2 )
E = h
0.29
max =
cm
T(K)
mM
r
d 3 (AU)
M tot(M Sun )
2 (yr) =
1
F=
L
4r 2
m = L m0
E pot = mgh
Fbb = T 4
m1r1 = m2 r2
E tot = E pot + E kin = const
L =

Krannert Art Show
Quinn G
At the Krannert Art museum I went to the Tamarind Institute and Rebirth of
Lithography. It was numerous pieces of art displayed in a open room with high ceilings.
The setup of the room is designed to draw your attention to the ar

Astronomy 210 Spring 2011
Homework Set #5: Solutions
1. A Newly Discovered Planet.
(a) [5 points] Since the star is the same as the sun and thus has the Suns mass, we can use the
2
simplied version of Kepler III: Pyr = a3 . Using P = 0.837 days = 0.0023 y

Astronomy 210 Spring 2011
Homework Set #4
Due in class: Friday, Feb. 25 Total Points: 50 + 5 bonus
1. The Cooling Nighttime Moon. This problem is wordy but is not dicult if you take it step by step.
Each point on the Moons surface is illuminated by the Su

Astronomy 210
Homework Set #9
Due in class: Friday, April 15
Total Points: 50 + 5 bonus
1. How far can the eye see? The human eye can see a star, under ideal conditions, as dim as an
apparent visual magnitude mlim 6.
(a) [5 points] If a star has absolute

NAME:
Astronomy 210
Spring 2011
HOUR EXAM 1
1. DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO.
2. Write your answers in the blue book provided to you.
3. Show all of your work, and indicate clearly your nal answer! A correct nal
answer may not receive cr

Hour Exam 1: Review Questions
Plausible questions: either from old exams,
or at right level for this exam
Telescopes must have tracking motors on them which rotate
the scope to keep the same celestial objects in the eld of view.
Briey (1-2 sentences) exp

NAME:
Astronomy 210
Spring 2011
HOUR EXAM 1
1. DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO.
2. Write your answers in the blue book provided to you.
3. Show all of your work, and indicate clearly your nal answer! A correct nal
answer may not receive cr

Hour Exam 2: Review Questions
Plausible questions: either from old exams,
or at right level for this exam
As discussed in class, planets in the solar system have many characteristics
in common and also many dierences. These shed light on the process of
pl

Astronomy 210 Spring 2011
Homework Set #1
Due in class: Friday, Jan. 28
Total Points: 50 points + 10 bonus points
Note: Your homework solutions should be legible and include all calculations, diagrams, and explanations. The TA is not responsible for decip

Astronomy 210 Fall 2010
Homework Set #2: Solutions
1. A sketch is useful. Scales are exaggerated to make the angular dierence more
apparent.
rshell
conj
1
opp
The distances to the stars are approximately ropp = rshell 1 AU = 9 AU (distance
when the stars

Astronomy 210 Spring 2011
Homework Set #2
Due in class: Friday, Feb. 4
Total Points: 50
1. [5 points] Suppose that in a heliocentric model, the stars were located on a true, literal celestial
sphere in the form of a shell at a radius rshell .
Put the shel

Astronomy 210 Fall 2010
Homework Set #3: Solutions
1. We are given the central force law
F = m1 m2 f (r ).
r
(1)
with f (r ) an unknown function of the distance r . We are also to assume that a
particle of mass m1 has a circular orbit centered on the orig

Astronomy 210 Fall 2010
Homework Set #3
Due in class: Friday, Feb. 11 Total Points: 50 + 5 bonus
1. Alternative Universes: Keplers Laws. [5 points] Consider an alternative universe, in which all of
the laws of physics are the same as ours, except gravity.

Astronomy 210 Spring 2011
Homework Set #4: Solutions
1. The Cooling Nighttime Moon.
(a) Combinign T (K) = T ( C) + 273 and T ( C) =
5
9
[T ( F) 32], we nd
5
[T ( F) 32] + 273
9
T (K) =
(1)
and so
9
[T (K) 273] + 32
5
and so the daytime Moon is at temperat

Sport and Socialization
KIN 101
Dr. Masucci
What is Socialization?
According to the Coakley (1998): Socialization is
an active process of learning and social
development that occurs as people interact with
one another and become acquainted with the
socia