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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The problem:
You don't have to actually do so, but it should be clear that if you wished to do so, you could take several observations of positions and clock times. The main point here is to think about how you would use that information if you did go to the trouble of collecting it. However, most students do not answer these questions in terms of position and clock time information. Some students do not pause the video as instructed. To be sure you are thinking in terms of positions and clock times, please take a minute to do the following, which should not take you more than a couple of minutes:
• Write down the position and clock time of one of the objects, as best you can determine them, in each of three different frames. This means that for each of the three readings, you just write down the clock time as it appears on the computer screen, and the position of the object along the meter stick. You can choose either object, but use the same object for all three measurements. Do not go to a lot of trouble to estimate the position with great accuracy. Just make the best estimates you can in a couple of minutes.
Which object did you choose and what were the three positions and the three clock times?
I observed the white tape in the 4th video segment and came up with the following tape positions and times:
Observation Location Time
1 5in. 20.453sec
2 11in. 20.671sec
3 22in. 21.000sec (The screen just displayed 21)
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 such observations:
• If you did take observations of positions and clock times, how accurately do you think you could determine the positions, and how accurately do you think you would know the clock times?
I believe that the accuracy of position would be the greatest challenge. The images are blurry when you pause so the accuracy of position would also be unclear. Probably the best estimate of position would be to the nearest inch. The clock times are significantly more accurate. The accuracy of the clock is to the nearest thousandths, so if you could accurately tell the position, the time would not be a problem.
• How can you use observations to determine whether the tape rolling along an incline is speeding up or slowing down?
In order to determine if the tape is speeding up or slowing down one would need to take position and time intervals at various places along the tape and then divide the distance measurements by the change in time from each point. If it took less time per unit of distance then the tape would be speeding up.
• How can you use your observations to determine whether the swinging pendulum is speeding up or slowing down?
You could determine if the swinging pendulum is speeding up or slowing down by performing the same types of measurements as described for the tape. I personally believe that the pendulum is speeding up until it reaches dead center and then is slowing down as it swings away from the center due to the effects of gravity.
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25 minutes
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I know that I am just beginning on my work but I will be working hard on everything over the next few weeks and should have all of the Phy 121 class material done on time. I will submit proctor information again tommorrow. Thank you for your time, understanding, and helping me.
Your work looks very good.