PHY 121
Your 'cq_1_01.1' 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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• If the position of a ball rolling along a track changes from 10 cm to 20 cm while the clock time changes from 4 seconds to 9 seconds, what is the average rate of change of its position with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> : Change in A = 20-10 = A = 10. Change in B = 9-4 = B = 5. avgA/AvgB = 10/5 = 2cm per second.
• If the velocity of a ball rolling along a track changes from 10 cm / second to 40 cm / second during an interval during which the clock time changes by 3 seconds, then what is the average rate of change of its velocity with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> : Change in A = 40-10 = 30. Change in B = 3. 30/3 = 10 cm per second.
• If the average rate at which position changes with respect to clock time is 5 cm / second, and if the clock time changes by 10 seconds, by how much does the position change?
answer/question/discussion: ->->->->->->->->->->->-> : A = ?, B = 10. A/10= 5. A = 50cm.
• You will be expected hereafter to know and apply, in a variety of contexts, the definition given in this question. You need to know this definition word for word. If you try to apply the definition without using all the words it is going to cost you time and it will very likely diminish your performance. Briefly explain how you will ensure that you remember this definition.
answer/question/discussion: ->->->->->->->->->->->-> : The average rate of change is a result of the rate in change of A respective to the rate of change in B. By doing practice problems like these I can ensure that I learn and retain this definition.
• You are asked in this exercise to apply the definition, and given a general procedure for doing so. Briefly outline the procedure for applying this definition, and briefly explain how you will remember to apply this procedure.
answer/question/discussion: ->->->->->->->->->->->-> : I don’t completely understand what you are asking me to describe or rather how it’s different from the previous question. To apply the definition, I need to be able to recognize problems that involve two different measures and ask for an average rate. Since rate is usually a physical measurement (in, cm, m) per unit time, average rate is just the total change in measurement per total unit time.
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15 minuets
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You've got the definitions but on some questions haven't applied them carefully. You also need to get the units right.
&#Please compare your solutions with the expanded discussion at the link
Solution
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