Phy 231
Your 'cq_1_09.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A ball accelerates uniformly as it rolls 20 cm down a ramp, starting from rest, in 2 seconds.
• What are its average velocity, final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
The average velocity is equal to 20cm/2s which equals 10cm/s. Because it is uniform the final velocity is double the average which equals 20cm/s. The acceleration is equal to 20-0 over 2 which equals 10cm/s^2
• If the time interval is in error so that it is 3% longer than the actual time interval, then what are the actual values of the final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
the average v would be 9.71 and the final would be 19.4cm/s. The acceleration would then be 9.4m/s^2.
• What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
The percent error would be 3%
• If the percent error is the same for both velocity and acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
This is so because it is uniform so the velocity and acceleration are both increasing at constant rates.
• If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
Not different.
** **
15 min
** **
&#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. &#