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Phy 121
Your 'cq_1_01.1' 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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The problem:
Here is the definition of rate of change of one quantity with respect to another:
The average rate of change of A with respect to B on an interval is
average rate of change of A with respect to B = (change in A) / (change in B)
Apply the above definition of average rate of change of A with respect to B to each of the following. Be sure to identify the quantity A, the quantity B and the
requested average rate.
If the position of a ball rolling along a track changes from 10 cm to 20 cm while the clock time changes from 4 seconds to 9 seconds, what is the average rate of
change of its position with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
change of a = 10 cm and change of b = 5 seconds
10cm/5 secs. = 2 cm/sec.
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If the velocity of a ball rolling along a track changes from 10 cm / second to 40 cm / second during an interval during which the clock time changes by 3 seconds, then
what is the average rate of change of its velocity with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
change of a = 30 cm/sec and change of b = 3 sec
30/3 = 10 cm/sec.
Would you have to determine the change of b by using the result from the first question because there is only one answer for this question is doesnt change.
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@& You are dividing 30 cm/sec by 3 sec, not 30 by 10.
You do get the number 3, but you also get units from dividing cm/sec by sec, and the units of that division are not cm / sec.*@
If the average rate at which position changes with respect to clock time is 5 cm / second, and if the clock time changes by 10 seconds, by how much does the position
change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The position would change by 20 cm because you would take 2cm/sec from the first question and multiply it by 10 sec. and get 20 cm/sec.
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@& The first question doesn't apply here. The quantities given here are not consistent with the quantities given in the first question.
Can you answer this in terms of just the quantities given in the question?*@
You will be expected hereafter to know and apply, in a variety of contexts, the definition given in this question. You need to know this definition word for word. If
you try to apply the definition without using all the words it is going to cost you time and it will very likely diminish your performance. Briefly explain how you
will ensure that you remember this definition.
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I will write down the definition and study it every night until I learn it word for word.
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*#&!
@& You're doing well here, but there are a couple of things you should revise. Having done so now will save you a lot of potential errors later, and it shouldn't take long.
&#Please see my notes and, unless my notes indicate that revision is optional, submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes.
If my notes indicate that revision is optional, use your own judgement as to whether a revision will benefit you. &#
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