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Phys201
Your 'cq_1_04.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_04.1_labelMessages **
The problem:
A ball is moving at 10 cm/s when clock time is 4 seconds, and at 40 cm/s when clock time is 9 seconds.
• Sketch a v vs. t graph and represent these two events by the points (4 sec, 10 cm/s) and (9 s, 40 cm/s).
• Sketch a straight line segment between these points.
• What are the rise, run and slope of this segment?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Rise=9sec-4sec=5sec
Run=40 cm-10cm=30cm
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`` 40 cm is not a quantity associated with this problem, nor is 10 cm.What quantities are associated with the numbers 40 and 10, and what are the meanings of these quantities?
What is the correct calculation of the rate, and what are the correct units for this rate?
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Slope=`dv/`dt=30cm/5sec=6cm/sec
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`` The requested rate is `dv / `dt, but `dv cannot possibly be 30 cm, since velocity cannot be measured in cm.
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• What is the area of the graph beneath this segment?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The area beneath the graph represents the change in position. The width of a region beneath the graph represents change in clock time.
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You are correct in this interpretation, but you also need to calculate the area.
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30 min
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You have an error with units in some of your quantities on the first question.
On the last problem you need to calculate the area as well as identify its meaning.
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