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phy 121
Your 'cq_1_06.1' 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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For each situation state which of the five quantities v0, vf, `ds, `dt and a are given, and give the value of each.
A ball accelerates uniformly from 10 cm/s to 20 cm/s while traveling 45 cm.
answer/question/discussion: ->->->->->->->->->->->-> :
v0 = 10 cm/s
vf = 20 cm/s
`ds = 45 cm
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A ball accelerates uniformly at 10 cm/s^2 for 3 seconds, and at the end of this interval is moving at 50 cm/s.
answer/question/discussion: ->->->->->->->->->->->-> :
a = 10 cm/s^2
`dt = 3 s
vf = 50 cm/s
v0 = vf - a(`dt)
= 50 cm/s - 10 cm/s^2 (3s)
= 50 cm/s - 30 cm/s
= 20 cm/s
`ds = (vf -v0) / `dt
= (50 cm/s - 30 cm/s) / 3s
= 20 cm/s / 3s
= 6.67 cm/s^2
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A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
answer/question/discussion: ->->->->->->->->->->->-> :
`ds = 30cm
v0 = 0
a = 20 cm/s^2
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Then for each situation answer the following:
Is it possible from this information to directly determine vAve?
answer/question/discussion: ->->->->->->->->->->->-> :
For the 1st problem vAve could directlly be determined but for the others it cannot because you have to determine other factors first.
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Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
For the 1st problem vAve could directlly be determined but for the others it cannot because you have to determine other factors first.
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15 min
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Very well done.
There's no need for any revision and your answers are good. There is additional discussion, which if provided simply for your reference and comparison whould you find this useful, at the link given below.
&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#