Phy 231
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 = 10 cm/s, vf = 20 cm/s, and 'ds = 45 cm are given. 45 cm/[(20 cm/s + 10 cm/s)/2] = 3 s; 'dv/'dt = (15 cm/s)/3s = 5 cm/s^2 = a
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: vf = 50 cm/s, a = 10 cm/s^2, 'dt = 3 s are given.
(50 cm/s – v0)/ 3s = 10 cm/s^2, v0 = 20 cm/s; therefore,
[(50 cm/s + 20 cm/s)/2] * 3 s = 35 cm
A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
answer/question/discussion: 'ds = 30 cm, v0 = 0 cm/s, a = 20 cm/s^2 are given. 0 cm/s + (20 cm/s^2)'dt = 30 cm, sqrt('dt) = sqrt(1.5 s^2), 1.2 s = 'dt, 0cm/s + (20cm/s^2)('dt)^2 = 30 cm/s = 'ds
Then for each situation answer the following:
Is it possible from this information to directly determine vAve?
answer/question/discussion: Yes; in fact, in the first question I utilized the average velocity as I was solving for the time traveled.
Is it possible to directly determine `dv?
answer/question/discussion: Yes; in fact, in the first question I denoted 'dv as I was dividing by 'dt to find a.
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20 minutes
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