Phy 121
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.
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Asst 4 Question 1
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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).
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I drew this and connected the two points with a line.
#$&*
Sketch a straight line segment between these points.
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I did already.
#$&*
What are the rise, run and slope of this segment?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
rise = 40cm/s-10cm/s=30cm/s
run= 9 sec-4 sec= 5 sec
slope = rise/run= (30 cm/s)/5 s= 6 cm/s^2
#$&*
What is the area of the graph beneath this segment?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Area = 1/2bh= 1/2(5s)(30 cm/s)=75cm
The region beneath the graph is a trapezoid, not a triangle.
#$&*
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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?
You may add optional comments and/or questions in the box below.
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Copyright © 1999 [OrganizationName]. All rights reserved.
Revised: 23 Jan 2010 13:51:40 -0500
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15 min.
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There's no need to revise, but see my note above and the linked document below:
&#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. &#