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Phy 122
Your 'cq_1_00.1' 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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Which object did you choose and what were the three positions and the three clock times?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The position of the pendulum at three different times:
- 59.4s, 6 in.
- 59.906s, 16in.
- 60.453s, 20in.
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In the following you don't have to actually do calculations with your actual data. Simply explain how you would use data of this nature if you had a series of several position vs. clock time observations:
If you did use observations of positions and clock times from this video, how accurately do you think you could determine the positions, and how accurately do you think you would know the clock times? Give a reasonable numerical answer to this question (e.g., positions within 1 meter, within 2 centimeters, within 3 inches, etc; clock times within 3 seconds, or within .002 seconds, or within .4 seconds, etc.). You should include an explanations of the basis for your estimate: Why did you make the estimate you did?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I would try to calculate the speed of the pendulum to see at which points during its travel that it is the fastest and at which point is it at its slowest. I would estimate that my data is accurate by up to about 5 centimeters because the pendulum was so thick that I could not determine the exact position it was at and the measuring tape was too far from the camera to make a more accurate estimate. The clock time for the first and third observations was taken directly from the computer screen so I would say they are accurate up to the millisecond but the second observation of the time was inhibited by the stick so I was not able to get a very accurate recording of the time.
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How can you use observations of position and clock time to determine whether the tape rolling along an incline is speeding up or slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
By calculating the speed the tape was going at the beginning of the incline by dividing the distance it rolled by the time it took to get there and then comparing it to the speed the tape was rolling at the end of its run by doing the same calculation for the two new points you can see whether it was going faster at the beginning or at the end.
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How can you use observations of position and clock time to determine whether the swinging pendulum is speeding up or slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
You can calculate the speed the pendulum was going at the beginning by picking a position along the measuring tape towards the top and then dividing that number by how long it took the pendulum to get there and then doing the same calculation for a position towards the bottom of the ramp to compare whether the pendulum was going faster at the top or the bottom.
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Challenge (University Physics students should attempt answer Challenge questions; Principles of Physics and General College Physics may do so but it is optional for these students): It is obvious that a pendulum swinging back and forth speeds up at times, and slows down at times. How could you determine, by measuring positions and clock times, at what location a swinging pendulum starts slowing down?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
By measuring the speed of the pendulum at many different positions you can determine when the pendulum speeds up and when it slows down.
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Challenge (University Physics students should attempt answer Challenge questions; Principles of Physics and General College Physics may do so but it is optional for these students): How could you use your observations to determine whether the rate at which the tape is speeding up is constant, increasing or decreasing?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
By following the same method I mention above and then comparing the speeds at different intervals you could see if it is speeding up or slowing down.
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&#Very good work. Let me know if you have questions. &#