course Phy 201 ¾òžñHÓõÍ¥õ¿ùäŽÙŸ¼nÞÏTè¸|ßassignment #000
......!!!!!!!!...................................
16:26:04 The Query program normally asks you questions about assigned problems and class notes, in question-answer-self-critique format. Since Assignments 0 and 1 consist mostly of lab-related activities, most of the questions on these queries will be related to your labs and will be in open-ended in form, without given solutions, and will not require self-critique. The purpose of this Query is to gauge your understanding of some basic ideas about motion and timing, and some procedures to be used throughout the course in analyzing our observations. Answer these questions to the best of your ability. If you encounter difficulties, the instructor's response to this first Query will be designed to help you clarify anything you don't understand. {}{}Respond by stating the purpose of this first Query, as you currently understand it.
......!!!!!!!!...................................
RESPONSE --> This query is about the basic ideas behind motion and timing.
.................................................
......!!!!!!!!...................................
16:29:16 If, as in the object-down-an-incline experiment, you know the distance an object rolls down an incline and the time required, explain how you will use this information to find the object 's average speed on the incline.
......!!!!!!!!...................................
RESPONSE --> You can calculate the average speed of an object by dividig the distance traveled by the time elapsed. confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:31:35 If an object travels 40 centimeters down an incline in 5 seconds then what is its average velocity on the incline? Explain how your answer is connected to your experience.
......!!!!!!!!...................................
RESPONSE --> The average velocity is the final position- initial position/ time elapsed. so 40cm/5sec=8cm per sec confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:35:57 If the same object requires 3 second to reach the halfway point, what is its average velocity on the first half of the incline and what is its average velocity on the second half?
......!!!!!!!!...................................
RESPONSE --> the average velocity on the first half is 4/3= 1.33 Then average velocity is final position 8 minus the initial position 1.33/ total time elapsed which was 5. so 1.334 confidence assessment: 2
.................................................
......!!!!!!!!...................................
16:40:50 Using the same type of setup you used for the first object-down-an-incline lab, if the computer timer indicates that on five trials the times of an object down an incline are 2.42 sec, 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 thefollowing: {}{}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 positioningthe object prior to release.{}{}e. Human uncertainty in observing exactly when the object reached the end of the incline.
......!!!!!!!!...................................
RESPONSE --> a. i think that the timer coul be off by about 1% b. the person doing the experiment could vary greatly during the clicking of the mouse. c. depending on the object and what surface conditions are as its traveling it could be thrown off. d. a delayed release would mess up the calculations or putting the object in a different location each time would make your outcomes vary. e. depending on the speed of the object it is sometimes diffucult to note exactly when the object reaches its point of measurement. Human error is a big thing. confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:42:49 How much uncertainty do you think each of the following would actually contribute to the uncertainty in timing a number of trials for the object-down-an-incline lab? {}{}a. The lack of precision of the TIMER program{}{}b. The uncertain precision of human triggering (uncertainty associated bLine$(lineCount) =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.
......!!!!!!!!...................................
RESPONSE --> a, 1% off b. up to 2 sec off c. up to 1 sec off d. up to 2 sec off e. up to 2 sec off confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:46:45 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 uncertain precision of human triggering (uncertainty associated with an actual human finger on a computer mouse){}{}c. Actualdifferences 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.
......!!!!!!!!...................................
RESPONSE --> a. calculate using the percent uncertainty. b. do the exact experiment a number of times to get the closest triggering possible. c. make sure you are starting the clock at the appropriate time each time. use the same clock in all the experiments. d. mark where the begining of the object is to be placed so you can put it in the exact location every time you start it. e. have several people watching the experiment a few times to see what their times were. then you could take the average of everyones. confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:48:08 According to the results of your introductory pendulum experiment, do you think doubling the length of the pendulum will result in half the frequency (frequency can be thought of as the number of cycles per minute), more than half or less than half?
......!!!!!!!!...................................
RESPONSE --> I think that by making the pendulum longer would definately lower the frequency. If you double it it should double the frequency.
.................................................
......!!!!!!!!...................................
16:49:03 Note that for a graph of y vs. x, a point on the x axis has y coordinate zero and a point on the y axis has x coordinate zero. In your own words explain why this is so.
......!!!!!!!!...................................
RESPONSE --> It is the center point the stationary point. Its the meeting point of your x and y coordinates. confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:52:17 On a graph of frequency vs. pendulum length (where frequency is on the vertical axis and length on the horizontal), what would it mean for the graph to intersect the vertical axis (i.e., what would it mean, in terms of the pendulum and its behavior, if the line or curve representing frequency vs. length goes through the vertical axis)? What would this tell you about the length and frequency of the pendulum?
......!!!!!!!!...................................
RESPONSE --> I would tell you the frequency of the pendulum. If it is going through at a positive point then it is probably a shorter pendulum that is moving at some speed. if it intersects at a neg. point the pendulum may be very long and slow. confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:55:04 On a graph of frequency vs. pendulum length, what would it mean for the graph to intersect the horizontal axis (i.e., what would it mean, in terms of the pendulum and its behavior, if the line or curve representing frequency vs. length goes through the horizontal axis)? What would this tell you about the length and frequency of the pendulum?
......!!!!!!!!...................................
RESPONSE --> It would tell you the length of the pendulum at a stand still you would have 0 frequency. confidence assessment: 3
.................................................
......!!!!!!!!...................................
16:58:24 If a ball rolls down between two points with an average velocity of 6 cm / sec, and if it takes 5 sec between the points, then how far apart are the points?
......!!!!!!!!...................................
RESPONSE --> 6*5=30cm apart confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:04:38 You were asked to read the text and some of the problems at the end of the section. Tell me about something in the text you understood up to a point but didn't understand fully. Explain what you did understand, and ask the best question you can about what you didn't understand.
......!!!!!!!!...................................
RESPONSE --> Enter, as appropriate, an answer to the question, a critique of your answer in response to a given answer, your insights regarding the situation at this point, notes to yourself, or just an OK. Always critique your solutions by describing any insights you had or errors you makde, and by explaining how you can make use of the insight or how you now know how to avoid certain errors. Also pose for the instructor any question or questions that you have related to the problem or series of problems. ok. I think that i understood everything up to this point in the text. i do not however like the dimensional analysis part it is confusing to me but it is a good way to check your answers. confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:09:39 Tell me about something in the problems you understand up to a point but don't fully understand. Explain what you did understand, and ask the best question you can about what you didn't understand.
......!!!!!!!!...................................
RESPONSE --> I think that i understood most of everything except for question #11 on the homework assignment. The ? is What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r= 2.86 +_ .09m? I thought I sould find the volume of the sphere and then take .09/that number and multiply by 100 but when i do that i dont get the right answer. v=4/3pir^3 so 4/3(3.14)2.86^3=97.941 so .09/97.941*100 gives me .09189 Im not for sure how they got the 9%. if you could explain this it would be helpful. confidence assessment: 3
.................................................