Phy 201
Your 'cq_1_9.1' 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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Seed Q 9.1
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?
Average velocity= (20+0)/2 which is 10cm/sec
The final velocity is the average vel(2) since initial velocity is 0. This means the final velocity is 10*2 which is 20cm/sec.
The acceleration is (20cm/sec-0cm/sec)/2sec giving 10cm/sec/sec.
answer/question/discussion: ->->->->->->->->->->->-> :
• 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: ->->->->->->->->->->->-> : If the time interval is 3% longer than the actual time interval then it is 1.94seconds. This means that the final velocity is really 20.6cm/sec and the acceleration is 10.3cm/sec.
• What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> : Percent error=actual/observed * 100
this would give 10.3/10 which would give 3% and 20.6/20 which is also 3%
• If the percent error is the same for both velocity and acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> : The original error was the same and influenced both numbers so they would be off by the same percentage.
• If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> : NA
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10 mins
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Solution
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