#$&*
PHY 241
Your 'cq_1_09.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_09.1_labelMessages **
A ball accelerates uniformly as it rolls 20 cm down a ramp, starting from rest, in 2 seconds.
What are its average velocity, final velocity and acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
`ds = 20 cm
`dt = 2 s
v_0 = 0 m/s
vAve = `ds / `dt = 10 cm/s
v_f = 20 m/s
a = 10 cm/s^2
#$&*
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: ->->->->->->->->->->->-> :
.03 = (2 - `dt) / `dt
`dt = 1.94 s
v_f = 20.6 m/s
a = 10.6 m/s^2
#$&*
What is the percent error in each?
answer/question/discussion: ->->->->->->->->->->->-> :
(20.6 - 20) / 20.6 * 100% = 3%
(10.6 - 10) / 10.6 * 100 = 6%
#$&*
If the percent error is the same for both velocity and acceleration, explain why this must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
The yare not the same, and they can't be
#$&*
If the percent errors are different explain why it must be so.
answer/question/discussion: ->->->->->->->->->->->-> :
v has a 3% error.
a is calculated using v and `dt, each of which have a 3% error, making a have 3% + 3% = 6% error
#$&*
&#Your work looks good. Let me know if you have any questions. &#