course PHY232 Professor Smith,I performed Assingment 0 on 25 Jan; howerver, I noticed it was not recieved. I may have not submitted the assingment propoerly using the work submitted form.
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20:29:06 Most queries in this course will ask you questions about class notes, readings, text problems and experiments. Since the first two assignments have been experiments, the first two queries are related to the experiments. While the remaining queries in this course are in question-answer format, the first two will be in the form of open-ended questions. Interpret these questions and answer them as best you can.
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RESPONSE --> Ok
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20:37:48 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 --> Experimental precision - I need to go back and review the precision the timer and the reason the timer is accurate to 0.01, I believe my answer as 0.001. The reporting or results and analysis in different ways lab- I did not understand some of the directions in the labs. I have not previously encountered this type of format with the send files and forms, so I am experiencing somewhat of a learning curve during the first two weeks.
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20:46:36 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 --> The descrepancie is due to the precsion of the human triggering the computer mouse which states the timer and observing exactily when the object reached the end of the incline. confidence assessment: 3
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20:56:32 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 --> a. The lack of precision of the Timer program, we already concluded in the timer program experiment that the timer precision is 0.01; however, precision does not guarantee accuracy. b. The uncertain precision of the human triggering the timer would have a greater affect, the experiment triggering the mouse with the index finger on the predominant hand and then repeating the experiment with the forefinger on the other hand resulted in a higher order error magnitude than the lack of precision of the timer. c. This experiment was not conducted in the transition to Physics, it was conducted in Physics I. As long as the position is not gross, it will not generate much error. confidence assessment: 2
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21:02:32 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. Exchange the timer for a better one. b. Connect a limit switch to the ball that would detect when it release and another limit switch at the bottom of the ramp to detect when the ball reached the bottom of the slope. The limit Switch would have a minute amount of error compared to a human triggering the timer. c. The differences are negligible. d. A mechanical device that would release the ball. e. The same limit switch used above in b. confidence assessment: 2
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