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phy201
Your 'cq_1_11.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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Asst 11 Question 1
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Your course (e.g., Mth 151, Mth 173, Phy 121, Phy 232, etc. ):
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Remember that it is crucial to enter your access code correctly. As instructed, you need to copy the access code from another document rather than typing it.
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The purpose and the process of answering 'seed' questions:
In cloud seeding small crystalline particles (the 'seeds') are scattered throughout a cloud, so that water vapor in the cloud will build up on the 'seed' and eventually fall in the form of rain.
These questions are posed without any previous explanation. You are expected to use what you already know, along with common sense, to answer the questions. It is standard practice in many courses to an instructor to give explanations and examples before asking students to answer questions, and you will see plenty of examples and explanations in this course. However the goal here is to first experience and think about a situation. Whether you think correctly or incorrectly, your thinking gets you started on an idea and forms a 'seed' on which understanding can accumulate.
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You are expected to answer it to the best of your ability, based on what you know at the beginning of this assignment.
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You are not expected to research this question until after you have submitted your best response.
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You are not penalized based on whether your answer is 'right' or 'wrong', but you are expected to think as clearly and deeply as you can about the question.
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You are not, however, expected to spend hours thinking about the question or agonize unduly about your answers. A rule of thumb is to give it up to 20 minutes, half for thinking and half for typing in your answers (maybe a little more for the typing if you don't have good keyboard skills).
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Your answers should consist of your best attempt at a solution, and/or one or more questions about the situation.
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If you think you know the answer or can make a reasonable attempt to answer, then give your answer along with a concise outline of your reasoning.
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If you aren't sure what the question is asking, make your best attempt to interpret and answer it, and consider including one or more questions.
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If you are very sure you don't know what the question is asking, then break it down phrase-by-phrase or even word-by-word and explain what you think each key phrase or word might mean.
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A question consists of a complete but concise statement of what you do and do not understand about the situation.
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There are two ways you can spend an excessive amount of time explaining your solutions and/or asking questions. One is to type a lot more than what is necessary, and another is to spend a lot of time worrying about what is and is not necessary. Balance the two in the way that works best for you.
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Remember that the 'concise' part is more for your benefit than mine. I can read a lot more quickly than you can type, and don't mind reading through a lot of words to understand your meaning.
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You are invited but not required to include comments and/or discussion.
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You are welcome to use reasonable abbreviations in your work.
Copy the problem below into a text editor or word processor.
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This form accepts only text so a text editor such as Notepad is fine.
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You might prefer for your own reasons to use a word processor (for example the formatting features might help you organize your answer and explanations), but note that formatting will be lost when you submit your work through the form.
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If you use a word processor avoid using special characters or symbols, which would require more of your time to create and will not be represented correctly by the form.
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As you will see within the first few assignments, there is an easily-learned keyboard-based shorthand that doesn't look quite as pretty as word-processor symbols, but which gets the job done much more efficiently.
You should enter your answers using the text editor or word processor. You will then copy-and-paste it into the box below, and submit.
Answer the following based on Newton's Second Law:
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How much net force is required to accelerate a 12 kg mass at 3 m/s^2?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
Recall the formula from Newton’s second law (F=m*a)
F = m*a
F = 12 kg * 3 m/s^2
F = 36 Newtons
Accelerating a 12 kg mass at 3 m/s^2 will require 39 Newton
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What would be the acceleration of a 4 kg mass subject to a net force of 20 Newtons?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
Recall the formula from Newton’s second law (F=m*a) this implies that a = F/m
a = F/m
a = 20 N / 4 kg
a = 5 m/s^2
A 4 kg mass subject to a net force of 20 Newtons will have a acceleration of 5 m/s^2
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If you exert a force of 20 Newtons on a 10-kg object and it accelerates in the direction of your force at 1.5 m/s^2, then how do you know there are other forces acting on the object besides your own?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
Recall the formula from Newton’s second law (F=m*a) this implies that a = F/m so if we are exerting 20 Newtons on a
mass of 10 kg we expect the acceleration to be:
a = F/m
a = 20N / 10 kg
a = 2 m/s^2’
So the expected acceleration is 2 m/s^2 and since the actual acceleration is less (1.5 m/s^2) we can be sure that there are
some other force or forces acting in the opposite direction to the 20 Newtons.
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What is the total of all those forces and in what direction does this total act?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
We know that the mass of the object is 10kg and we know that the object accelerate at 1.5 m/s^2 in the direction of the 20N force will call this
force F1 and we will call the summation of all the other forces F0.
The net force (Fnet) acting on the object is Fnet = F1 +F0
Recall the formula from Newton’s second law (F=m*a) the force in this formula is the net force (Fnet ) acting on the object.
Fnet = m *a
Fnet = 10kg * 1.5 m/s^2
Fnet = 15 N
So it the net force acting on the object is 15 Newtons
Fnet is equal to the force F1 plus the summation of all the other forces action on the object F0
Fnet = F1+F0
15n = 20N +F0
F0 = 15 N - 20 N
F0 = -5N (the negative sign indicate that the force is acting in the opposite direction to the directing the object is traveling)
From the calculation above the net force acting on the object is 15 Newtons. The 20 Newtons acting in the direction of acceleration
is opposed by force or forces that combine to give 5 Newtons acting in the opposite direction of acceleration.
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Copy and paste your work into the box below and submit as indicated:
Your instructor is trying to gauge the typical time spent by students on these questions. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
* Approximately how much time did you spend on this question?
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Copyright © 1999 [OrganizationName]. All rights reserved.
Revised: 06 Feb 2010 17:10:16 -0500
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self-critique rating
&#Very good responses. Let me know if you have questions. &#