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Phy 121
Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Question Form_labelMessages **
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#$&* _ ave ang vel vs midpt clock time _ trial least ave vel
Report in the first line below the data you previously obtained for the trial with the greatest average velocity.
Starting in the second line report your average angular velocity vs. midpoint clock time data for this trial. You will report a clock time and an average angular velocity for each 180-degree interval. Use comma-delimited format with one interval reported per line.
After reporting the requested information, explain how you obtained your midpoint clock times and your average angular velocities.
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Your answer (start in the next line):
60, 1.057, 2.137, 2.392
84.51 deg/sec, 2.13 sec (180deg/2.13 sec)
169 deg.sec, 2.13 sec(360 deg/2.13 sec)
253.52 deg.sec, 2.13 sec (540 deg/2.13 sec)
I found the average angular velocity from my previous data (total degrees every 180 degrees/total seconds), then I divided the interval by 2 and added it to the initial clock time of the interval (2.137//2=1.0685, 1.0685+1.057=2.13 sec)
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I am just confused if I am using the correct data points?
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I think this is in response to a previous question I posed. If so, you should include a copy of that question, along with the work to which I responded, so I can put my answer into the context of that exchange.
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Your data appear to indicate that the strap rotated through the first 180 degrees in 1.057 second, through the second 180 degrees in 2.137 second and through the last 60 degrees in 2.392 second.
Does this agree with your understanding of the intervals you timed?
Your calculation 180 deg / (2.13 s) would be appropriate to the second 180 degree interval, provided the 2.13 s is your interpretation of the second time interval 2.137 seconds (which should actually be rounded to 2.14 seconds). If you intended to divide 180 deg by the 2.13 seconds you got from 1.0685+1.057=2.13 sec, that would not be appropriate. That 2.13 sec is the midpoint of the second interval. You don't get the average velocity by dividing the 180 deg moved during an interval by what the clock happens to read. Average velocity is change in position divided by change in clock time.
In either case, 2.13 seconds does not correspond to an interval of 360 deg, nor to an interval of 540 deg.
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There are two questions here:
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Your data indicate three time intervals. How far did the strap rotate during each of these intervals, and what therefore was the average angular velocity during each?
Then, a separate question, what was the midpoint clock time of each interval? Your 2.13 seconds was the midpoint clock time of the second interval.
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