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course PHY 241
review and revisions of Seed Question 7.2
cq_1_072#$&*
PHY 241
Your 'cq_1_07.2' 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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235 pm 10/24/2011
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15 minutes
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An automobile rolls 10 meters down a constant incline with slope .05 in 8 seconds, starting from rest.
The same automobile requires 5 seconds to roll the same distance down an incline with slope .10, again starting from rest.
At what average rate is the automobile's acceleration changing with respect to the slope of the incline?
answer/question/discussion: ->->->->->->->->->->->-> :
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'ds= 10 m
t = 8 s
v = 'ds/'dt
= 10 m / 8 s
= 1.25 m/s
a = 'dv/'dt
= 1.25 m/s / 8 s
= 0.15625 m/s^2
@& You have divided vAve by `dt, not `dv by `dt.
Your values for the accelerations are therefore off by a factor of two.*@
############# the link at the bottom of the page gave me the solution to Seed Question 7.1 I clicked on the link and checked the solution to Seed Question 7.1 and I am on point! I feel the link may have been put on this document Seed Question 7.2 by mistake #################
'ds = 10 m
t = 5 s
v = 'ds/'dt
= 10 m / 5 s
= 2 m/s
a = 'dv/'dt
= 2 m/s / 8 s
= 0.25 m/s^2
delta(a)/delta(slope) = (a_2 - a_1) / (slope_2 - slope_1)
= (0.25 m/s^2 - 0.156 m/s^2) / (0.10 - 0.05)
= 1.875 m/s^s-slope
@&
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@& Check my note. Common error, so be sure you avoid it.
Except for that you're in good shape on this one.
Your results would all be double what you got.*@