Phy231
Your 'cq_1_6.1' 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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For each situation state which of the five quantities v0, vf, `ds, `dt and a are given, and give the value of each.
• A ball accelerates uniformly from 10 cm/s to 20 cm/s while traveling 45 cm.
answer/question/discussion:
v0=10cm/s
vf=20cm/s
`ds=45cm
vAve=(10cm/s+20cm/s)/2=15cm/s
`dt=45cm/15cm/s=3s
a=(20cm/s-10cm/s)/3s=3.3cm/s^2
• A ball accelerates uniformly at 10 cm/s^2 for 3 seconds, and at the end of this interval is moving at 50 cm/s.
answer/question/discussion:
a=10cm/s^2
`dt=3s
vf=50cm/s
v0=50cm/s-(10cm/s^2*3s)=20cm/s
vAve=(50cm/s+20cm/s)/2=35cm/s
`ds=35cm/s*3s=105cm
• A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
answer/question/discussion:
`ds=30cm
a=20cm/s^2
v0=0
vf=sqrt(v0^2+2a`ds)=sqrt(0^2+2(20cm/s^2)(30cm))=sqrt(1200cm^2/s^2)=34.6cm/s
vAve=(0cm/s+34.6cm/s)/2=17.3cm/s
`dt=30cm/17.3cm/s=1.73s
Then for each situation answer the following:
• Is it possible from this information to directly determine vAve?
answer/question/discussion:
Yes see above
• Is it possible to directly determine `dv?
answer/question/discussion:
Yes simply subtract v0 from vf.
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20 minutes
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&#Very good responses. Let me know if you have questions. &#