Phy 201
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.
** **
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: ->->->->->->->->->->->-> : The graph consists of the x axis being labeled as clock time and starting from zero to 9 seconds. The y axis consists of velocity and starts with 0 cm/s and ends with 40 cm/s. The points ( 4sec, 10 cm/s) and (9s, 40 cm/s) are on the graph and a line is drawn from zero and connecting those two points.
• Sketch a straight line segment between these points.
answer/question/discussion: ->->->->->->->->->->->-> : Sketched a line between the points.
• What are the rise, run and slope of this segment?
answer/question/discussion: ->->->->->->->->->->->-> : The rise is (40 cm/s – 10 cm/s) = 30 cm/s. The run is (9 sec – 4 sec) = 5 sec. The slope = rise/run or (30cm/s)/(5sec) = 6 cm/s/s
• What is the area of the graph beneath this segment?
answer/question/discussion: ->->->->->->->->->->->-> : Since the area under the segment is a trapezoid I split it up into a triangle with the base stretching from 4 sec to 9 sec and the height stretching from 10 sec to 40 sec. I then took the average of the height or 15 ((40-10)/2) and multiplied it by the base (9-4) to get 75. I then took the area of the rectangle left over with the length of 6 and the width of 10. I multiplied these together to get 60 and added it to the area of the rectangle, 75, and got 135.
** **
20 minutes
** **
&#See the link provided below. However, unless you have questions or additional comments, you may ignore the request for a revision.
&#
&#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. &#