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Phy 201
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.
** CQ_1_06.1_labelMessages **
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: ->->->->->->->->->->->-> :
We are given v0=10 cm/s and vf=20 cm/s and `ds=45. From v0 and vf, since acceleration is uniform we can directly find vAve. We can find `dt by: dv/vAve.
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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: ->->->->->->->->->->->-> :
We are given a=10 cm/s^2 and `dt=3 seconds and vf=50 cm/s. From a and `dt we can find `dv. From vf and dv we can find v0. From v0 and vf we can get vAve. Then using vAve and dt we can find `ds.
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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: ->->->->->->->->->->->-> :
We are given ds=30 cm and v0=0 and a=20 cm/s^2. We can’t reason out anything from what we are given. We can use vf^2=v0^2+2a*ds to find vf. Then we can find vAve from v0 and vf. Then we can find dv as well from vf and v0 and we can get dt from ds and vAve
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Then for each situation answer the following:
Is it possible from this information to directly determine vAve?
answer/question/discussion: ->->->->->->->->->->->-> :
The first situation we can directly get vAve. The second one we can’t directly get the vAve we need some more info. And the third one can’t determine anything directly.
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&#Very good responses. Let me know if you have questions. &#