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Phy 121
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.
** CQ_1_09.1_labelMessages **
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: ->->->->->->->->->->->-> :
vAve=20cm/2s=10cm/s
vf=(10cm/s)*2=20cm/s
a=(20cm/s)/(2s)=10cm/s^2
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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: ->->->->->->->->->->->-> :
new time interval= 2.06s
vAve=20cm/2.06s=9.71cm/s
vf=(9.71cm/s)*2=19.42cm/s
a=(19.42cm/s)/(2.06s)=9.43cm/s^2
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What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
vAve= 10/9.71= 3%
vf=20/19.42=3%
a=10/9.43=6%
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If the percent error is the same for both velocity and acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
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If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
vf contains a 3% error and dt contains 3% error and both of these are used to calculate acceleration, so acceleration has twice as much error as the origional stated 3%
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15min
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&#Very good responses. Let me know if you have questions. &#