Lecture 4 Quiz
Question 1
0 out of 0.5 points
Hubble Space Telescope is still the largest scope ever built.
Answer
Selected Answer:
True
Question 2
0 out of 0.5 points
In which part of the electromagnetic spectrum is it possible for astronomers to observe
Question 1
0.4 out of 0.4 points
On the H-R diagram, a star spends most of its lifetime.
Answer
Selected
Answer:
on the main
sequence.
Question 2
0.4 out of 0.4 points
While more massive than most of its neighbors, the Sun is still technically
a low mass
Lecture 6 Quiz
Question 1
0.5 out of 0.5 points
The parallax angle for a star is measured to be 0.289". What is the distance to this star in parsecs?
Answer
Selected Answer:
3.46
Question 2
0.5 out of 0.5 points
The nearest star to our Sun, Alpha Centauri
Question 1
0.4 out of 0.4 points
Compute the wavelength of radio waves emitted by WBAP News/Talk radio out of Dallas, TX
broadcasting at 820 kHz on the AM dial.
Answer
Selected Answer:
365.85 meters
Question 2
0 out of 0.4 points
The spectra of the star H
Review Test Submission: Lecture 3 Quiz
Score
6.5 out of 20 points
Question 1
0.5 out of 0.5 points
In the Bohr model, the transitions of electrons down to ground state produce the Lyman lines in the
ultraviolet.
Selected Answer:
True
Question 2
0 out of 0
Lecture 5 Quiz
Question 1
0.5 out of 0.5 points
The Zeeman effect proves that sunspots are caused by.
Selected Answer:
intense magnetic fields
Question 2
0 out of 0.5 points
Surface features on the Sun that are cool regions created by local variations in
Review Test Submission: Lecture 1 Quiz
Question 4
0 out of 0.4 points
The parallax angle of L726-8 A is 0.381. What is the distance to this star in parsecs?
Answer
Selected Answer: 10
Question 8
0 out of 0.4 points
How many arc-seconds would there be in 1
Question 1
0 out of 0.4 points
Which method relies on the mass of a dark object revealing its presence?
Answer
Selected Answer:
ring occulations
Question 2
0.4 out of 0.4 points
How do astronomers determine the mass of the Milky Way galaxy?
Answer
Selecte
Question 1
0 out of 0.4 points
According to the data from the microwave background radiation, at what speed and in what direction is
Earth moving through the universe?
Answer
Selected Answer:
600 km/s North
Question 2
0.4 out of 0.4 points
While a variety
Question 1
0 out of 0.4 points
0.0064 meter is
Answer
Selected Answer:
0.64 mm.
640 mm.
Question 2
0 out of 0.4 points
The star Tau Ceti is located at a distance of 11.895 light years. What is this distance in parsecs?
Answer
Selected Answer:
7.5x10^5
Qu
1
Order-of-Magnitude/Fermi Problems
T. Ferguson, August 19, 2010.
(This note is based on one originally written by Prof. R. Holman.)
1.1
Introduction
One skill that all physicists should possess is the ability to estimate the approximate numerical
answer
Physical Analysis, 33-231 Solutions to Exam 3
Fall Semester 2010
Problem 1. (a) The characteristic equation is: 9r 2 + 6r + 4 = 0. So we get:
r =
62 (4)(9)(4)
6
18
1
6 3
1
i
=
= .
3
18
3
3
Thus, this is a two-complex-root case, and we know that the solu
Physical Analysis, 33-231 Homework Assignment 4
Due MONDAY, September 20, 2010.
dy
Problem 1. (a) Using partial fractions, solve the dierential equation: (x2 1) dx = 2y for y(x),
given the initial condition y(2) = 5. (b) Without using Maple, check your an
Physical Analysis, 33-231 Homework Assignment 3
Due Wednesday, September 15, 2010.
Problem 1. Many new cars are now wired so that their headlights are always on whenever the engine
is running, even in broad daylight. We would like to estimate by what perc
Physical Analysis, 33-231 Homework Assignment 2
Due Wednesday, September 8, 2010.
1) Estimate the magnitude of the orbital angular momentum of the Earth about the Sun. Remember
that the angular momentum of an object about a point is L = r p, where r is a
Physical Analysis, 33-231 — Solutions to Exam 2
Fall Semester — 2010
Problem 1. (a) To ﬁnd the critical points, we set: % = y2(y w 2)(y + 3) = 0, which has solutions
ofc = 0, 2, "-3. For c = 0, if 0 < y < 2, then the 3 terms in ﬁg- = y2(y—2)(y—3) are (+)(
Physical Analysis, 33-231 Solutions to Practice Exam 3
Fall Semester 2010
Problem 1. (a) The characteristic equation is: 9r 2 + 12r + 4 = 0. So we get:
r =
12
(12)2 (4)(9)(4)
2
= .
3
18
Thus, this is a repeated-root situation, and the solution is:
2
y(x)
Physical Analysis, 33—231 — Solutions to Exam 2
Fall Semester - 2009
Problem 1._ (a) The gain in population in a time At due to births is: AP(births) = ﬁPAt = (60 +-
ﬁlP) PAt = [0.01P+0.001P2]At. The loss in population in a time At due to deaths is: AP(de
Solutions to Practice Exam 1, Physical Analysis Fall Semester 2010
Problem 1. (a) TRUE: You should have done the following calculation:
(1 kg) (1000 gm/kg)
= 103 gm/cm3 .
3 (100 cm/m)3
(1 m)
(b) FALSE: Using our approximation (1 + )p 1 + p, with = 0.02 an
EXAM 2
Physical Analysis, 33-231
October 27, 2009
NAME:
No calculators, books, or notes are allowed for this exam.
Read each problem carefully before attempting to solve it.
Explain briey but completely all your steps and all your reasoning.
WRITE LAR
Practice Exam 3 Physical Analysis, 33-231, Fall 2010
Problem 1.
(a) (10 points) Solve the dierential equation:
d2 y
dy
9 2 + 12
+ 4y = 0
dx
dx
for y(x), given the initial conditions y(1) = 9 and dy(1) = 2. Give all the numerical values in your nal
dx
answ
Practice Exam 1 Physical Analysis, Fall 2010
Problem 1. True/False. For each of the following statements, write out your answer as either TRUE or
FALSE. Then give a short but complete explanation or calculation showing why you think the statement
is true