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phy 201
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** CQ_1_09.1_labelMessages **
Seed 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?
answer/question/discussion: ->->->->->->->->->->->-> :
ds= 20 cm
v0= 0 cm/s
dt= 2 s
vAve= 20 cm/ 2s
vf=10 cm/s *2
vf= 20 cm/s
a=20 cm/s /2s
a= 10cm/s^2
vAve=10 cm/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: ->->->->->->->->->->->-> :
ds=1.94
dt=20 cm
v0=0
vAve=20cm/1.94s
=10.3
Vf= 20.6 cm/s
A= 20.6 cm/s/1.94
=10.6 cm/s^2
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• What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
1% error in each
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10.3 cm/s differs from 10 cm/s by 0.3 cm/s. 1% of 10 cm/s is 0.1 cm/s. So your 1% response is not correct for the average velocity. It's not correct for the acceleration either.
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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: ->->->->->->->->->->->-> :
they are traveling at a uniform rate. the velocity and acceleration must correspond to each other sense that is the case.
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• If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
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