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### PS119.homework5.10.25

Course: WEB 119, Fall 2009
School: Concordia Chicago
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Word Count: 656

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Autumn PS119, 2005 Handed out Oct. 26, 2006 Due: Nov. 3, 2006 (Friday) 1. Derive the Jean's mass in for a cloud of temperature T and density nH. Start with the equation MJ=V=nHmHV, where is in g/cm3. Use the expression for the radius of the cloud, RJ in parsecs, from the notes or the lectures. Convert the answer to solar masses. 2. An interstellar cloud has a mass of 100 solar masses, a temperature of 100 K and a...

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Autumn PS119, 2005 Handed out Oct. 26, 2006 Due: Nov. 3, 2006 (Friday) 1. Derive the Jean's mass in for a cloud of temperature T and density nH. Start with the equation MJ=V=nHmHV, where is in g/cm3. Use the expression for the radius of the cloud, RJ in parsecs, from the notes or the lectures. Convert the answer to solar masses. 2. An interstellar cloud has a mass of 100 solar masses, a temperature of 100 K and a density of 100 particles per cubic centimeters. What is its approximate radius if it is just on the verge of collapse? 3. The surface gravity on the Earth is g=GM/r2=980cm/sec2. M and r are the mass and radius of the Earth, respectively. What is the surface gravity on the Sun? What is the surface gravity of a star with a radius 10 times that of the Sun but the same mass as the Sun? What is the surface gravity of a white dwarf with the mass of the Sun and a radius equal to that of Earth? For stars on the main sequence, g is almost the same for all stars. (The other examples in this problem are NOT on the main sequence.) 4. An eclipsing binary contains a giant star (star A) and a less massive, main sequence star (star B). Both stars are G2 stars. Star A is bigger in radius than star B. Draw a picture of the two stars in orbit, depicting the case that star B is between A and the Earth, and then the case that star A is between B and the Earth. The plane of the orbit is in the line of sight, so the two stars eclipse each other in the respective cases. When the big star comes between B and Earth, the light from B is eliminated. When B comes between A and the Earth, the light from A is partially dimmed, but the light from B is still present. The parallax of both stars is arcsec. 0.01 Hint: The G2 main sequence star is just like the Sun. a. Draw the curve of light intensity vs. time (schematically) for the total system (that is, the light seen from both stars at once, from Earth, as a function of time). Assume the same light pattern is seen over and over again, giving the period, P. Let P=1 year. Let tA be the width of the dip seen when A covers B and tB be the B is in front of A. Label the diagram with these symbols. Likewise, let the dimming when A covers B be mA and the dimming when B is in front of A be mB. Recall our discussion of the eclipse of the moon by the Earth, for the rest of the problem. b. What is the luminosity of star A if mA is 0.01? c. What is the absolute magnitude of star A? d. What is the radius of star A? e. What is the value of mB? f. The (very difficult) measurement of radial velocity from the Doppler shifts in the spectra show that the lines of star A from the average velocity (when both stars show the same velocity, because they are moving perpe...

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Concordia Chicago - WEB - 119
PHSC 119 Set 5 Solutions 1. The Jean's mass is MJ=V=nHmHV where the volume is V = (4/3)pRJ3RJ(parsecs)=5(T/nH) parsecs and Msolar=1.99*10^33 g so3 3/2 1/2MJ/Msolar=V=nHmHV=nHmH(4/3)p 5 (T/nH) = (500p /3)T nH mH 3/2 1/2 1/2 so MJ/Msolar
Concordia Chicago - WEB - 119
PHSC 119 Set 5 Solutions1.RJ(parsecs)=5(T/nH)1/2 parsecs and Msolar=1.99*10^33 g soThe Jean's mass is MJ=V=nHmHV where the volume is V = (4/3)pRJ3MJ/Msolar=V=nHmHV=nHmH(4/3)p 53(T/nH)3/2 = (500p /3)T3/2 nH-1/2mH so MJ/Msolar =[(500p /3)T3/2
Concordia Chicago - WEB - 119
Phy Sci 119a Homework 6 Posted 11/03/06 Due: 11/13/06 1. An Earthsize planet orbits a distant G star. The orbit is such that the planet partially eclipses the star. How deep is the eclipse (how much is the star dimmed) when the planet is in front o
Concordia Chicago - WEB - 119
Problem Set 6 SolutionsPhySci 119, Prof. Don York November 21, 20061Problem 1The amount of dimming is proportional to the amount of light that is blocked by the planet, which is proportional to the ratio of areas (as it appears in the plane of
Concordia Chicago - WEB - 119
Phy Sci 119a Homework 7 Posted 11/16/06 Due: 11/22/06 1. A pulsar (rotating neutron star that periodically exposes a bright spot to an Earth observer) emits a radio and a (weak) optical pulse every 0.007 seconds. If the spot is assumed to be on the
Concordia Chicago - WEB - 119
Phy Sci 119a Homework 7 Posted 11/16/06 Due: 11/22/06 1. A pulsar (rotating neutron star that periodically exposes a bright spot to an Earth observer) emits a radio and a (weak) optical pulse every 0.007 seconds. If the spot is assumed to be on the s
Concordia Chicago - WEB - 119
PHSC 119 Set 7 Solutions 1. If we see the pulse every 0.007 seconds, then the star must be making a full rotation every 0.007 seconds. The circumference over the pulse rate is the rotation speed. So, Velocity of the neutron star = 2*Pi*Radius of the
Concordia Chicago - WEB - 119
PHSC 119 Set 7 Solutions 1. If we see the pulse every 0.007 seconds, then the star must be making a full rotation every 0.007 seconds. The circumference over the pulse rate is the rotation speed. So, Velocity of the neutron star = 2*Pi*Radius of the
Concordia Chicago - WEB - 119
PS119, Autumn 2006 Posted Nov. 20, 2006 (Monday) Due: Nov. 29, 2006 (Wednesday)1. We have now explored the lifetimes of stars in various parts of the HR diagram and the relationships between luminosity and mass and age and radius. See the lecture
Concordia Chicago - WEB - 119
PS119, Autumn 2006 Posted Nov. 20, 2006 (Monday) Due: Nov. 29, 2006 (Wednesday)1. We have now explored the lifetimes of stars in various parts of the HR diagram and the relationships between luminosity and mass and age and radius. See the lecture n
Concordia Chicago - WEB - 119
Problem Set 8 SolutionsPhySci 119, Prof. Don York November 30, 20061Problem 1For this problem, we will assume that we know the main sequence lifetime. The lifetimes can be found in Table 21-1 in the text.1.1Part aLet's take an O star as
Concordia Chicago - TEST - 119
Concordia Chicago - TEST - 119
Question 1, Test #3, B 1933 D 1921 E 1969 C 1938 A 1918 Question 2, Test #3, 4g 5d 1a 6b 2e 7c 3f Question 3, Test #3, a) Here, for simplicity, I will assume that all stars in the Galaxy are 1 solar mass stars. The typical lifetime of a star of 1 sol
Concordia Chicago - TEST - 119
Question 1, Test #3, B 1933 D 1921 E 1969 C 1938 A 1918 Question 2, Test #3, 4g 5d 1a 6b 2e 7c 3f Question 3, Test #3, a) Here, for simplicity, I will assume that all stars in the Galaxy are 1 solar mass stars. The typical lifetime of a star of 1 sol
Concordia Chicago - TEST - 119
Concordia Chicago - TEST - 119
Recognizing that the system is a binary:1pt - both stars form from an interstellar cloud2pt - Star A evolves faster than star B2pt - Star A dumps gas onto star B and they exchange masses2pt - Star A supernovas first leaving either a neutron star
Concordia Chicago - WEB - 119
PS119 Lab 5: MEASURING THE MASS OF THE EARTH The Cavendish Experiment and the acceleration due to gravity1. Introduction In 1687 Newton published his law of Gravity asserting (i) that the force between any two point masses was given byFg =G &quot; m
Concordia Chicago - WEB - 119
PS 119 Laboratory # 6: The Moons of Jupiter Historical Introduction Galileo discovered the moons of Jupiter on January 7th 1610. He observed the moons for the next few nights and rushed off to write a letter to his sponsor, the Prince of Venice. A co
Concordia Chicago - WEB - 119
PS 119 Laboratory # 6: The Moons of Jupiter Historical Introduction Galileo discovered the moons of Jupiter on January 7th 1610. He observed the moons for the next few nights and rushed off to write a letter to his sponsor, the Prince of Venice. A co
Concordia Chicago - WEB - 119
PhySci 119a Lecture 5 Oct . 4, 2006 Music, open ing: R imsky-Ko rsa kov (1844- 1908) , Flight of the Bum ble Bee, performed first in 1901. From Tsar of Sultan . Th e composer received forma l train ing in mu sic only lat er in life, y et st ill creat
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CUNY Baruch - GEOG - 221
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Syllabus for GTECH 710 Introduction to Mapping Sciences Fall 2004 Tuesdays 5:30 9:00 PM Instructor: Jochen Albrecht Office: Hunter N1030 E-Mail: jochen@geo.hunter.cuny.edu TA: Pyung Ho Kim Course Overview:Mapping Sciences provides a survey of the b
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Lab One: Prerequisite MathDue Date and Time:GoalsIn order to complete the mapping sciences labs in this book, you will need a fair understanding of algebra and at least a conceptual understanding of trigonometry. You will review and practice the
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Lab Two: Computer Operating SystemsDue Date and Time:GoalsFamiliarity with a multi-user computer operating system is a must in the complex computer oriented world we live in. In this lab, you will be introduced to the various computer functions o
CUNY Baruch - GTECH - 710
Lab Three: The Graticule and Viewing Geographic InformationDue Date and Time: The project file is located at: My city is: Your city is described in question five. The city is the first city in the table row containing your student number. Graticule:
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Lab Five (Part B): Changing ProjectionsGoals In this lab you will learn how to create your own project file by adding new themes to your view and how to change the projection of data using ArcView. You will convert a data set of point from decimal d
CUNY Baruch - GTECH - 710
Lab Seven: Map Projections &amp; GraphsDue date and Time: Goals In this lab you will generate several graphs using data collected from Lab Five. What you will turn in You will turn in hard copy graphs demonstrating the 5o by 5o area around various citie
CUNY Baruch - GTECH - 710
Lab Eight: Qualitative and Quantitative MappingDue Date and Time: The project file is located at:GoalsIn this lab you will make three maps with both qualitative and quantitative symbols. These maps will contain both point and area symbols. You wi
CUNY Baruch - GTECH - 710
Lab 9: Exploring Vector GISDue date and time: Data is located at: My State for question nine is:GoalsIn this lab you will explore geographic data as an aid to decision-making, learn how to understand map units, and project geographic data in comp
CUNY Baruch - GTECH - 710
Lab 9B: Creating new shapefiles from photographsYour task: You just started working for the NYS Parks Department. One of your first assignments for your division is to create a new interactive map server for all the parks in New York State, so that
CUNY Baruch - GTECH - 201
Lab One: Prerequisite MathDue Date and Time:GoalsIn order to complete the mapping sciences labs in this book, you will need a fair understanding of algebra and at least a conceptual understanding of trigonometry. You will review and practice the
CUNY Baruch - GTECH - 201
Lab Two: Computer Operating SystemsDue Date and Time:GoalsFamiliarity with a multi-user computer operating system is a must in the complex computer oriented world we live in. In this lab, you will be introduced to the various computer functions o
CUNY Baruch - GTECH - 201
Lab Three: The Graticule and Viewing Geographic InformationDue Date and Time: The project file is located at: My city is: Your city is described in question five. The city is the first city in the table row containing your student number. Graticule:
CUNY Baruch - GTECH - 201
1Lab Four: Text, Context, and HypertextDue Date and Time:_ My city is:_ The project file is located at:_IntroductionWhen we think of the digital revolution, we tend to focus on flashy devices like Global Positioning Systems in expensive automob
CUNY Baruch - GTECH - 201
Lab Five (Part B): Changing ProjectionsGoals In this lab you will learn how to create your own project file by adding new themes to your view and how to change the projection of data using ArcView. You will convert a data set of point from decimal d
CUNY Baruch - GTECH - 201
Lab Six: UTM Coordinates and Location FindingDue Date and Time: My traverse is composed of these points on this map:GoalsIn this lab, you will locate several points on a USGS 7.5' topographic map and determine the coordinates of these points. The
CUNY Baruch - GTECH - 201
Lab Seven: Map Projections &amp; GraphsDue date and Time: Goals In this lab you will generate several graphs using data collected from Lab Five. What you will turn in You will turn in hard copy graphs demonstrating the 5o by 5o area around various citie
CUNY Baruch - GTECH - 201
Lab Eight: Qualitative and Quantitative MappingDue Date and Time: The project file is located at:GoalsIn this lab you will make three maps with both qualitative and quantitative symbols. These maps will contain both point and area symbols. You wi
CUNY Baruch - GTECH - 201
Lab 9: Exploring Vector GISDue date and time: Data is located at: My State for question nine is:GoalsIn this lab you will explore geographic data as an aid to decision-making, learn how to understand map units, and project geographic data in comp
CUNY Baruch - GTECH - 201
Lab 9B: Creating new shapefiles from photographsYour task: You just started working for the NYS Parks Department. One of your first assignments for your division is to create a new interactive map server for all the parks in New York State, so that
CUNY Baruch - GEOG - 221
CUNY Baruch - GEOG - 221
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