Phy231
Your 'cq_1_07.1' 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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A ball falls freely from rest at a height of 2 meters. Observations indicate that the ball reaches the ground in .64 seconds.
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Based on this information what is its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
v0=0 vf=? 'ds=2m 'dt=.64s vAve=2m/.64s=3.125m/s 3.125m/s=(0+vf)/2 vf=6.25m/s
a=(6.25m/s - 0m/s)/.64s= 9.76m/s^2
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Is this consistent with an observation which concludes that a ball dropped from a height of 5 meters reaches the ground in 1.05 seconds?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
v0=0 vf=? 'ds=5m 'dt=1.05s vAve=5m/1.05s=4.76m/s 4.76m/s=(v0+vf)/2 9.52m/s=(0+vf) vf=9.52m/s
a=(9.52m/s-0)/1.05s=9.07m/s^2
No, but they're very close.
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Are these observations consistent with the accepted value of the acceleration of gravity, which is 9.8 m / s^2?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
The first is very close to the acceleration of gravity, in fact if I rounded up it would be the exact number. The second one isn't quite as fast as the acceleration of gravity.
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15min
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3/3/10 11am
&#This looks very good. Let me know if you have any questions. &#