PHY 231
Your 'cq_1_07.1' 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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A ball falls freely from rest at a height of 2 meters. Observations indicate that the ball reaches the ground in .64 seconds.
• Based on this information what is its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
The ball's average acceleration is about 5 m/s/s.
Calculations:
aAve = 'dv / 'dt
aAve = ( 2 m/.64 s - 0 m/s ) / ( .64 s )
aAve = ( 3.125 m/s ) / ( .64 s )
aAve = 4.8828125 m/s/s or about 5 m/s/s
2 m/.64 s is the average velocity, not the final velocity
otherwise this is correctly reasoned and well expressed
#$&*
• Is this consistent with an observation which concludes that a ball dropped from a height of 5 meters reaches the ground in 1.05 seconds?
answer/question/discussion: ->->->->->->->->->->->-> :
It seems like the results are consistent at about 5 m/s/s.
Calculations:
aAve = 'dv / 'dt
aAve = ( 5 m/1.05 s - 0 m/s ) / ( 1.05 s )
aAve = ( 4.761904762 ) / ( 1.05 s )
aAve = 4.535147392 m/s/s or about 5 m/s/s
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• Are these observations consistent with the accepted value of the acceleration of gravity, which is 9.8 m / s^2?
answer/question/discussion: ->->->->->->->->->->->-> :
These values are not consistent with the general rule that an object falls at 9.8 m/s/s. They both seem to be approximately half of that accepted gravitational constant.
see my earlier note
#$&*
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Copy and paste your work into the box below and submit as indicated:
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15 Minutes
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You'll understand the discussion, so no need for a revision, but be sure to see my notes and check the link.
&#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. &#