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Phy 231
Your 'cq_1_01.2' 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:
Answer the following:
How accurately do you think you can measure the time between two events using the TIMER program?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
To the nearest hundredth of a second, because anything more is questionable because of the programs lack of ability to accurately clock fast mouse clicks
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What is the shortest time interval you think you would be able to measure with reasonable accuracy?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
To the hundredths of a second, because of the same thing stated above
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How does the percent error in timing intervals change as the time between the events gets smaller?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The smaller the time between events, the greater the percent of error in timing
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How accurately are you able to measure the positions of the ball and the pendulum in the initial video?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
On a good day, to the nearest inch . Because the video was blurry, I had a hard time seeing the markings on the ruler. By the video alone, there is no way to get more accurate than the nearest inch.
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&#Your work looks very good. Let me know if you have any questions. &#
Phy 231
Your 'formatting guidelines and conventions' 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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Copy this document into a word processor or text editor.
Follow the instructions, fill in your data and the results of your analysis in the given format.
Regularly save your document to your computer as you work.
When you have completed your work:
Copy the document into a text editor (e.g., Notepad; but NOT into a word processor or html editor, e.g., NOT into Word or FrontPage).
Highlight the contents of the text editor, and copy and paste those contents into the indicated box at the end of this form.
Click the Submit button and save your form confirmation.
You should have a permanent notebook dedicated to the lab portion of this course. You should keep a record of the lab work you do, including free-hand sketches of apparatus and reasonably accurate but not meticulous hand-sketched graphs (you will likely use the computer to make meticulous graphs, but in the hand-sketching process you think about important aspects of the graph that don't necessarily become apparent if you use a machine to do the sketching).
Some of your data will be taken by a computer or with the aid of a computer, and you will not be expected to write down the hundreds or thousands of data points involved in that process, but you should keep a small sample indicative of the results you obtain, and preliminary observations on trends and other aspects of your data which might be relevant to what you are observing.
You should also keep a record of where your data files are located, and you should maintain a secure backup of all your data files. If you lose your data, you might end up having to repeat your experiment.
You might at any point in the course be asked to reproduce information from your lab work. You lab notebook will be the key to being able to do so.
Indicate below, in your own words, the importance of maintaining a good lab notebook.
To have a reference to look at for future lab assignments, to have a paper backup, and because writing these things down by hand sticks in my mind better than typing them or putting the figures into the computer program. Also, it is good to have in case the instructor wants to see my work.
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It will be very important in your course that you report data in a way that can be both easily understood and electronically processed by your instructor and by your fellow students.
Report 4 two-digit numbers (e.g., 78 is a two-digit number; you can make up any four such numbers you like), one to each line, with a short note starting at the 5th line indicating how you chose your numbers (the note and the explanation should be brief and uncomplicated; it's not intended to be difficult. Anything you put down will be fine.)
your brief discussion/description/explanation:
12
24
48
96
The #12 just popped into my head, so I thought I would double it and continue doubling the value until I had four #s.
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Next report four 2-digit numbers in one line, separated by commas, and a short note starting at the 2d line briefly explaining how this format is different than the one in your preceding response.
your brief discussion/description/explanation:
12, 24, 48, 96
The #s are on the same line separated by commas, not separated by lines
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Suppose we have a meter stick oriented to that readings run in cm from left to right. Suppose we also have some object sitting at the 15 cm position. Another object at the 25 cm position will be 10 cm to the right of the first object, so the position of the second object relative to the first is +10 cm (remember that increasing numbers go to the right, so + indicates an object to the right of the reference position).
A third object sitting at the 5 cm mark will have a position relative to the first of -10 cm (as we move to the left readings on the meter stick decrease, so the - sign indicates a position to the left of the reference object).
An object with a position relative to the first object of -5 cm will be 5 cm to the left of the reference object, which will place it at the 10 cm mark of the ruler.
Call the position of the first object the reference position. Then an object at +25 cm relative to the reference position will be 25 cm to the right of the 15 cm mar, putting it at the 40 cm mark.
Jot down your answers to the following in your lab notebook. It is suggested that you accompany your answers with a sketch. If you don't yet have a dedicated lab notebook
What would the position relative to the reference object of an object at the 20 cm mark?
Where on the ruler would be an object at position -7 cm relative to the reference object?
If an object is at the 2 cm mark on the ruler, what is its position relative to the reference position?
What is the position on the ruler of an object located at +35 cm with respect to the reference position?
Place your answers in the first line of the indicated space below, with commas between your answers. Place only numbers and commas in this line.
On the second line specify the meaning of the numbers on the first line, and the units represented by those numbers (the units here are centimeters).
Then give a brief explanation of your understanding of the concept of relative position.
your brief discussion/description/explanation:
5, 8, -13, 50
5 from the reference point, object @ 8, -13 from the reference point, object @ 50, units in cm
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Suppose the y positions 5, 12, 21, 37, in cm, occur at respective clock times 2,4,6,8 seconds. A comma-delimited table of y vs. t would then consist of 4 lines with the t value first and the y value second.
Important convention: When we list one quantity vs. the second quantity, it's the second quantity, the one after the 'vs.', that goes in the first column. Remember this.
So the table corresponding to the above information would be
2, 5
4, 12
6, 21
8, 37
Suppose now that temperatures of 80, 60, 50 and 45 deg occur at clock times 3, 10, 24 and 41 minutes.
Report this temperature vs. clock time data in the indicated space below, in comma-delimited format as explained above. Use numbers only--no units. The units will be explained in your additional lines.
Then add a sentence or two starting in the fifth line, which specifies what these number mean: which number is first, which is second, and why; what quantity is belng listed vs. what; and in what units each quantity is being reported.
your brief discussion/description/explanation:
3, 80
10, 60
24, 50
41, 45
1st # is clock times in minutes, 2nd # is temperature in degrees. In this order because the temperature is vs. the clock time
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Suppose that in a flow experiment depths of 30, 20, 14 and 9 cm occur at clock times of 2, 12, 24 and 36 seconds. List the clock times only in the first line, separated by commas. List the depths only in the the second line, also in comma-delimited format. Starting in the third line, briefly explain what you did.
your brief discussion/description/explanation:
2, 12, 24, 36
30, 20, 14, 9
I put the vs. info in the first line units are in seconds, and I put the 1st info on the second line units are in cm.
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Now go into Notepad or another text editor, list the ordered pairs indicating the data just given above, but in tab-delimited format.
You have to go into another program to enter tabs because if you try to enter a tab on the form, it will 'jump' you to the next 'answer box'.
Enter your data so that on the first line you have your first clock time, then a single tab (hit the 'tab' key on your keyboard), followed by the first depth.
Then add a line for each subsequent data point, so that you have reported your information on four lines delimited by tabs.
On the fifth line, specify the units of the data you have given. Starting in the next line give a very brief explanation of what you just did.
Then highlight, copy and paste this data into the form.
your brief discussion/description/explanation:
2 30
12 20
24 14
36 9
Column1 units are seconds, column2 units are cm
I put the clock time in seconds in column 1 because they are vs. the depths in cm which I put in column 2.
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Suppose that the third column of the Timer program shows the numbers 3.7, 4.3, 5.2, 3.9, 4.3. Recall that the third line consists of the time intervals between clicks.
The clock time of the first click would be in the middle column. If necessary, briefly review the TIMER program, or the data you have obtained from that program.
We will define the 'first click' as the one that occurred at the beginning of the 3.7-second interval.
What would be the clock time relative to the first click of each of the four given numbers from the third line?
List these clock times in the first line in comma-delimited format. In the second line indicate the units of the numbers you have placed in the first line, and explain how you obtained the clock times.
your brief discussion/description/explanation:
8, 13.2, 17.1, 21.4
Units in seconds, obtained by starting with 3.7 + 4.3= 8 then + 5.2= 13.2 then +3.9= 17.1 then + 4.3= 21.4
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Suppose that in a room at temperature 23 C, an experiment reports 50 C, 40 C, 35 C and 31 C. Report these temperatures in Celsius degrees in the first line, using comma-delimited format. In the second line report in the same format the temperatures relative to room temperature. In the third line specify what the units are, that the second-line temperatures are relative to room temperature, and also report the room temperature.
your brief discussion/description/explanation:
50, 40, 35, 31
27, 17, 12, 8
Units in degrees Celsius, 2nd line temps. are relative to room temp. of 23 C
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Finally, suppose that the temperatures given above occur at clock times 10, 20, 30 and 40 minutes. Report temperature vs. clock time in comma-delimited format, one temperature and one clock time to a line.
Then in a fifth line, report in comma-delimited format the average rate of temperature change with respect to clock time, in degrees Celsius per minute, on each of the three intervals.
Starting at the sixth line state what is reported in your lines, and how you obtained your average rates.
your brief discussion/description/explanation:
10, 50
20, 40
30, 35
40, 31
-1, -1/2, -2/5
1st column clock intervals in minutes, 2nd column temps in degrees Celsius at clock intervals. Average rate in Celsius/min by taking the change in A(degrees celsius)/ change in B(minutes) of the first 2 intervals, then the 2nd and 3rd intervals, then the 3rd and 4th interval.
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Your instructor is trying to gauge the typical time spent by students on these experiments. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
Approximately how long did it take you to complete this experiment?
1 hour 15 minutes
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You may also include optional comments and/or questions.
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Please copy your document into the box below and submit.
#$&* self-critique
&#This looks good. Let me know if you have any questions. &#