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ASTR 1020 Homework Assignment 8
Please note:
If there is a pre-selected answer for any of the True/False or Multiple Choice questions
below it will be the default of “a”. This does NOT automatically mean that “a” is the correct answer. It
may or may not be correct.
Type in your answers for the review questions below and adjust the
selection of the multiple choice answers as you see fit. Then submit under Assessments/Assignments
Homework dropbox.
1.
Why is mass so important to a star's life? How and why do we divide stars into groups by mass?
The birth mass determines the fusion progression within the core of the star, we divide these into
groups because lower mass stars usually live longer than higher mass stars and they can produce
different elements trough fusion.
2.
When a star exhausts its core hydrogen fuel, the core contracts but the star as a whole expands.
Why?
The inner portions being more dense and closer to the gravitational center fall at a faster rate. Before
the outer portions have a chance to fall in too far, the core starts new fusion and releases new energy
again. This blows the outer portions away from the star.
3.
What is the helium fusion reaction, and why does it require much higher temperatures than
hydrogen fusion? Why will helium fusion in the Sun begin with a helium flash?
Helium fusion reaction is when 3 helium nuclei become one carbon nucleus. Helium has 2 protons
which means greater positive charge. This is needed more speed for strong force to overcome
electromagnetic repulsion resulting in greater temperature.
4.
Why does the H-R diagram of a globular cluster show a
horizontal branch
? What are the
characteristics of the stars on the horizontal branch?
After the helium flash, stars become hotter, smaller, and less luminous. It is horizontal because the stars
have the same luminous. It is horizontal because the stars have the same luminosity, but different
surface temperature.
5.
What happens to a low-mass star after it exhausts its core helium? Why can't it fuse carbon into
heavier elements?
The star dies, carbon fusion requires temperatures near 600 million K. Degeneracy pressure stops that
from happening.
6.
What is a
planetary nebula
? What happens to the core of a star after a planetary nebula occurs?
A planetary nebula is a shell of gas expanding away from carbon core and ionized by the ultraviolet
radiation of the hot carbon core, which makes it glow.
7.
Summarize the stages of life that we see on the Sun's life track. Be sure to explain both the
changes that occur in the Sun's core with each stage and the changes that are observable from
outside the Sun.
Main sequence is when hydrogen burning in the core then
sub giant/ red giant which ro core contacts,
hydrogen shell burning, helium flash leads to helium burning, red increased radius and luminosity ,
gravitational equilibrium reached again, then double shell burning leads to expansion, which equals to
brighter and bigger outer resulted with the outer layers blown into planetary nebula.
8.
A) True/False: The iron in my blood came from a star that blew up more than 4 billion years ago.
true
false
b) Explain your reasoning.
It is but because all elements except hydrogen and helium were produced in stars.
9.
A) True/False: Humanity will eventually have to find another planet to live on, because one day
the Sun will blow up as a supernova.
true
false
b) Explain your reasoning.
False because the sun will not explode, but it
will be a white dwarf after going through the phases of
red giant.
10.
A) True/False:
I sure am glad hydrogen has a higher mass per nuclear particle than many
other elements. If it had the lowest mass per nuclear particle, none of us would be here.
true
false
B) Explain your reasoning.
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Related Questions
Provide a brief solution in problem in the picture below.In picture below, there's an answer key for the problem.
So, your answer from a to g must be the same in an answer key provided below.
Thank you in advance.
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Instructions: Your task is to create a model in response to the prompts in the question below. Be sure to apply a model from this class and include the relevant diagram(s) for that model. And don’t forget to use the Claim, Evidence, Reasoning framework to present your solution.
Phenomenon: Runaway Truck Ramp
A truck was driving on a highway at 30 m/s when its brakes gave out. The driver steered it onto a “runaway truck ramp”, consisting of an upward ramp (rising 12 meters vertically over 120 meters horizontally), and ending with a compressible barrier which you can model as a giant spring with spring constant “k”. The compressible barrier can be compressed by a maximum 0.5 meters before it stops working.
Graphic attached
Values: Mass of the truck: 20 metric tons (1 metric ton = 1000kg).
Mass of the driver: Choose a reasonable value.
Truck Ramp Dimensions: 12 meters vertical, 120 meters horizontal
Spring constant k= 6.0 x 107 J/m2.
Part 1: Big…
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please have step by step solution and explain the problem. i need you to explain the steps with sentences as well to help me understand
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use guess method if you cant use guess method like the example below dont do the question at all please and thank u
please do it in guss method no other way
Solving problems in Physics, we must always use GUESS method.Guess stands for:
Guess: G Here you write down what is given in the questionUnknown: U Here you list what you have to calculate, to solve for.Equations: E here you list all the formulas you need to use to solve the problemSubstitution: S This first letter S in the word, you will just substitute what is given in theformula. You do not calculate anything. The calculations will occur at the second S: Solve. Whatis very important here is to carry with you the units of measure in the formula. Not only thenumbers. This is very important, once again.Solve: S The last step, second S, you will solve what you plugged in the first S for Substitution.Very important here is to manipulate the units of measure such that the final units of measureto be proved by your work. This part…
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please follow instruction do not do it other way follow guess method only please
Solving problems in Physics, we must always use GUESS method.Guess stands for:
Guess: G Here you write down what is given in the questionUnknown: U Here you list what you have to calculate, to solve for.Equations: E here you list all the formulas you need to use to solve the problemSubstitution: S This first letter S in the word, you will just substitute what is given in theformula. You do not calculate anything. The calculations will occur at the second S: Solve. Whatis very important here is to carry with you the units of measure in the formula. Not only thenumbers. This is very important, once again.Solve: S The last step, second S, you will solve what you plugged in the first S for Substitution.Very important here is to manipulate the units of measure such that the final units of measureto be proved by your work. This part is very important, since you will allow you to verify thatwhat you do is…
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How do u solve for part B , i know that we will need to use pv = nRT to solve part a bit what about part B?
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JUST ANSWER D, E AND F. PLS I NEED A GOOD AND CLEAR HANDWRITTEN ANSWERS. PLS ANSWER IN DETAIL
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all the answers you gave me are correct. thanks I just need d
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Please include the diagram you used to solve this problem, Thank you!
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M Gmail
O YouTube
A Maps
O RCAP
QUESTION 2
Problem
A new type of force was discovered by physicists with the following expression:
α
Fnew
+ Be* + 3x^
where alpha & beta are constants, and x is the position. The expression above was obtained from the interaction of a massless Higg
s Boson (a type of particle) and a black hole.
Quantum physicists then decides to design and build a machine that is able to move the Higgs Boson from x2 to x1. How much work
should the machine do to achieve this feat? (For simplicity, consider that no energy is lost in the process)
Solution
To determine the work done we apply the following
W =
Fx
dx
Evaluating the above, we get
W = aln
| x
beta
e X
3/5
5
for the limits from x¡ to xf
substituting x1 and x2 as the limits, the work done is expressed as
W =
| +
X1
e
( x15
x2 )
x2
MacBook Pro
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51
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-3
-4
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The class I'm taking is physics for scientists and engineers!
I am completely stuck. Need help. I have attached the problem. Please view both attachments before answering.
*****I need help with parts D and F please. ******
***please use SI units and report the numeric part only for all answers!***
I have also attached the links to BOTH videos below. If you can please explain your answer so I can fully understand. Thank you so much!
Link: https://youtu.be/eK7dMnnElx8Link: https://youtu.be/4IYDb6K5UF8
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Part A
Learning Goal:
To understand and use exponential decays.
Exponential decay occurs when a quantity y is
proportional to the number e taken to the power
-t/T. The quantity T is known as the time
constant. So we say that y equals A times the
quantity (e to the power of minus t over T) and
write this mathematically as
y = Ae-T/T,
where A is a constant.
SCALING Whenever t increases by one time
constant, y decreases by a factor of 1/e. For
instance:
• At time t = 0, y = A.
• Increasing time to t = 7, reduces y
to A/e.
⚫ A further increase to t = 2T reduces
y by another factor of 1/e to A/e².
Generally, we can say:
At t = nT, y has the value A/en.
LIMITS As t becomes large, y becomes very small
and approaches zero.
Consider the case when the constant A = 3 and 7 = 4. Plot the graph of y = 3e-t/4 at each available point from
t = 0 to t = 10.
+
*
血
No elements selected
4.0
3.0
y
2.0
1.0
0
2.0
4.0
6.0
8.0
10.0
t
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nce Principles Sen x
r19.core.learn.edgenuity.com/Player/
Google Docs
Science Principles Semester A
de with
个
1
2
ооооо
3
Which statements are true? Select three options.
4
Mark this and return
C
+
Functions can have one parameter.
Functions can have many parameters.
Functions must have a return value.
Functions must have a parameter.
Functions can have two parameters.
O
3
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DELL
6
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Save and Exit
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b
~ (avc)
~ (avc)^b
a
C
avc
- (pv ~ q)
- (pv~ q)^r
T.
F.
II
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a. 240 kph
b. 300 kph
c. 350 kph
d. 400 kph
e. 440 kph
2. Which of the following is correct if a helicopter flies from the same origin, what will be its average velocity in an hour travel?
a. 1,212.20 kph
b. 1,500 kph
c. 1,000 kph
d. 1,414.20 kph
e. 800 kph
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Read and stuuy Chapter 4, Dasic Physics for Radiography, mom your textDOOK Radiograpriy Essentials for Limited PractICE.
After studying the basic theory of the physics and energy transformation principles behind the production of radiation in the assigned readings,
carefully evaluate the following questions and draft your responses to post in the forum.
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Do the round off on final answer only.
Follow the instructions carefully.
Answer the first three questions only A, B, C
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1. What is the total cost (sandwiches and delivery charge) if a family orders 5 sandwiches? 7 sandwiches? Be sure to show
your work.
2. What is the total cost of x sandwiches?
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3. Go to: https://www.geogebra.org/classic/zesjcbvj Graph the total cost of sandwiches and delivery based on the
number of sandwiches ordered. Be sure to label your axes and scale them by labeling each gridline with a number.
****Submit a screenshot****
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4. Is there a proportional relationship between the number of sandwiches and the cost of the order? Explain how you know.
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