phy 201
Your 'cq_1_02.1' 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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The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
What is your best guess about the ball's average velocity?
answer/question/discussion: average velocity would be 7cm/sec. it also seems this ball is rolling down an incline since it is speeding up and more than doubling its velocity at the end.
Without further information, why is this just a guess?
answer/question/discussion: because I was given only two velocities a starting and end so I added the two and divided by 2 to get the average. This doesn’t seem like the correct since the ball is steadily increasing
If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: I think between the 4cm/sec and 10cm/sec I would assume 21cm because it travels first at 4 cm/sec/ then at the halfway point it increases to 7cm/sec and last 10cm/sec so I added these numbers together.
Everything is fine up to here.
At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: velocity would be on top (a) and time on bottom (b) = 21cm/sec /3sec = 7 cm
You have some errors here.
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15 minutes
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&#At least part of your solution does not agree with the solution and comments given at the link below. You should view the solution at that link and self-critique as indicated there.
Solution
This link also expands on these topics and alerts you to many of the common errors made by students in the first part of this course. &#
phy 201
Your 'cq_1_02.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
What is your best guess about the ball's average velocity?
answer/question/discussion: average velocity would be 6cm/sec. it also seems this ball is rolling down an incline since it is speeding up and more than doubling its velocity at the end.
This is not correct. Your first submission was correct on this question.
Without further information, why is this just a guess?
answer/question/discussion: because I was given only two velocities no change in time. I used the average velocity equation x2-x1/t2-t1
If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: I will take the average velocity * time to get the distance so; 6cm/sec * 3sec = 18 cm
Had you used the correct average velocity, as you did previously, this would have been correct.
At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: velocity would be on top (a) and time on bottom (b) = 6cm/sec / 3 sec = 2cm/sec
This is correct analysis, except that the units are not done correctly.
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15 minutes
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I went over my answers after submitting them and decided I did not answer the questions correcly I am sorry to submit the same excercise twice
See my notes.
If you correct your first submission, then this one will also be covered.