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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.
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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: ->->->->->->->->->->->-> :
a = 20cm/s^2
vf = 10cm/s
average velocity = 5cm/s
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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: ->->->->->->->->->->->-> :
a = 20.6cm/s^2
vf = 10.6 cm/s
@& Your result for the acceleration must be based on the final velocity, which must be calculated from the given information (displacement 20 cm from rest) but with a time interval that is 3% shorted than the given 2 seconds (as stated the 2 second time interval is 3% longer than the actual time interval, so the actual time interval is about (but not exacxtly) 3% shorter than 2 seconds).
So what are the average velocity, final velocity, and acceleration, based on a time interval 3% shorter than 2 seconds?*@
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What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
3%
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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: ->->->->->->->->->->->-> :
Because they are equal.
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If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
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*#&!*#&!*#&!
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I've made the first question more specific. You need to find the time interval, then calculate velocities and acceleration based on the modified value.
&#Please see my notes and, unless my notes indicate that revision is optional, submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes.
If my notes indicate that revision is optional, use your own judgement as to whether a revision will benefit you. &#
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