#$&*
Phy 201
Your 'cq_1_09.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A ball accelerates uniformly as it rolls 20 cm down a ramp, starting from rest, in 2 seconds.
What are its average velocity, final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
average velocity= change displacement/change time= 20cm/2seconds= 10cm/s
final velocity is 2*10cm/s since the initial velocity is equal to zero
final velocity= 20cm/s
acceleration= change velocity/change time=(20cm/s)/2seconds= 10cm/s^2
#$&*
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: ->->->->->->->->->->->-> :
final velocity= 19.4cm/s
acceleration= 9.4cm/s^2
#$&*
What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
percent error= (actual-calculated/actual)*100
20cm/s-19.4cm/s/20cm/s*100= 1.5% error for final velocity
@& right, but that's a 3% error*@
error for acceleration= 6% error
@& very good*@
#$&*
If the percent error is the same for both velocity and acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
#$&*
If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
The percent errors are different because the error is being applied mulitple times, in the calculation for velocity and acceleration.
#$&*
** **
15 min
** **
@& Very good.
Keep up the good work.*@