course Phy 232 직UCȡ~֕assignment #000
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09:26:51 Different first-semester courses addressed the issues of experimental precision, experimental error, reporting of results and analysis in different ways and at different levels. One purpose of these initial lab exercises is to familiarize your instuctor with your work and you withthe instructor 's expectations. {}{}Comment on your experience with the three lab exercises you encountered in this assignment.
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RESPONSE --> The labs introduced me to the type of things that I would be doing this summer in labs; however, I didn't learn anything new.
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09:31:21 This question, related to the use of the TIMER program in an experimental situation, is posed in terms of a familiar first-semester system. Suppose you use a computer timer to time asteel ball 1 inch in diameter rolling down a straight wooden incline about 50 cm long. If the computer timer indicates that on five trials the times of an object down an incline are 2.42sec, 2.56 sec, 2.38 sec, 2.47 sec and 2.31 sec, then to what extent do you think the discrepancies could be explained by each of the following: {}{}a. The lack of precision of the TIMER program{}{}b. The uncertain precision of human triggering (uncertainty associated with an actual human finger on a computer mouse){}{}c. Actual differences in the time required for the object to travel the same distance.{}{}d. Differences in positioning the object prior to release.{}{}e. Human uncertainty in observing exactly when the object reached the end of the incline.
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RESPONSE --> a. The TIMER program is accurate to the 0.01; therefore, the numbers recieved would be accurate. This is not a very good explanation for discrepancy. b. Human triggering isn't really a good explanation either because it would take milliseconds to react to the ball going down the incline, reaching the bottom, and clicking the mouse. The TIMER program wouldn't even calculate that into the number. c. This could be a reasonable explanation depending on how you start the ball. If you start it by pushing it to the edge, it would travel faster with a harder push across the same difference rather than if you pushed it slowly. Also, dropping the ball onto the ramp from different heights would change it as well. d. I kind of went over this in part c. This would be a good possible explanation for discrepencies. e. The human eye can be somewhat decieving and also sometimes we get trigger happy and click to early or too late. This is a good explanation for discrepancy as well. confidence assessment: 3
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09:32:01 How much uncertainty do you think each of the following would actually contribute to the uncertainty in timing a number of trials for the ball-down-an-incline lab? {}{}a. The lack ofprecision of the TIMER program{}{}b. The uncertain precision of human triggering (uncertainty associated with an actual human finger on a computer mouse){}{}c. Actual differencesin the time required for the object to travel the same distance.{}{}d. Differences in positioning the object prior to release.{}{}e. Human uncertainty in observing exactly when the object reached the end of the incline.
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RESPONSE --> This question is the same as the previous one? confidence assessment: 3
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09:34:15 What, if anything, could you do about the uncertainty due to each of the following? Address each specifically. {}{}a. The lack of precision of the TIMER program{}{}b. The uncertainprecision of human triggering (uncertainty associated with an actual human finger on a computer mouse){}{}c. Actual differences in the time required for the object to travel the same distance.{}{}d. Differences in positioning the object prior to release.{}{}e. Humanuncertainty in observing exactly when the object reached the end of the incline.
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RESPONSE --> a. I personally couldn't change the precision of the TIMER program. I would have to contact the person that made it. b. This reaction of the human finger could be improved by making sure your finger is over the mouse and lowered onto the button for a quick click. c. Just make sure that the ball starts the same way every time. d. Make sure you have the ball start the same way and with the same amount of force every experiment. e. You could set up a laser sensor or pressure sensor and when the ball crosses the finish line, the TIMER program is stopped. confidence assessment: 3
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