PHY 231
Your 'cq_1_02.1' 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:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
• What is your best guess about the ball's average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I would guess the ball's average velocity would be at or a little more than seven centimeters per second. I reason for a little more than seven centimeters per second because I think it gets harder and harder to overcome the air pressure when flying through the air; thus, it might be slightly more difficult to climb the farther this ball has to go, making its average be a little more than 7 centimeters per second if the ball ends with a perfect velocity of 10 centimeters per second.
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
This is just a guess because we do not know how long the ball was in the air, what types of air pressure it came in contact with while in the air, and other important factors influencing how the ball accelerated from four centimeters per second to 10 centimeters per second.
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• If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
My best guess would be that the ball traveled somewhere in the neighborhood of 21 centimeters if I used my averaged aforementioned guess ( 7 X 3 = 21 ). But, I also reason 21 centimeters, because I drew a figure. If at second zero, the ball was traveling at four centimeters, in order to get to 10 centimeters per second in a linear fashion, the ball's rate would increase by 2 centimeters per second. Of course, not everything moves in linear fashion; it is just easy to conceptualize. Averaging these average rates per centimeter equates to three averaged intervals, illustrating the ball traveling 5 centimeters, 7 centimeters, and 9 centimeters, which all equates to 21 centimeters as well.
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• At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I believe I am answering what I calculated previously, hypothesizing in the last question, that the average rate its velocity changed with respect to clock time was a positive 2 centimeters per second, at an overall average rate of 7 centimeters per second.
Your units aren't completely correct here. Be sure to check the discussion in the link given at the end of this document.
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15 Minutes
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&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#