course phy 201
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17:07:40 Intro Prob 6 given init vel, accel, `dt find final vel, dist If initial velocity is v0, acceleration is a and time interval is `dt, then in symbols what are the final velocity vf and the displacement `ds?
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RESPONSE --> If you have the acceleration and the the initial velocity and the change in time you can find the final velocity. acceleration is 'dv/'dt by multiplying 'dt by the acceleration you have the 'dv left. The 'dt is the vf-vo. So to find the final velocity you would add the initial velocity to the change in velocity. One you have the final velocity you can find the average velocity by adding the initial and final velocity and then dividing it by two . Once you do that they you can multiply the average velocity by the change in time and you will get the change in displacement. 'ds
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17:08:07 **You would use accel. and `dt to find `dv: a * `dt = `dv. Adding `dv to initial vel. vo you get final vel. Then average initial vel. and final vel. to get ave. vel.: (v0 + vf) / 2 = ave. vel. You would then multiply ave. vel. and `dt together to get the distance. For example if a = 3 m/s^2, `dt = 5 s and v0 = 3 m/s: 3 m/s^2 * 5 s = 15 m/s = `dv 15 m/s + 3 m/s = 18 m/s = fin. vel. (18 m/s + 3 m/s) / 2 = 10.5 m/s = vAve 10.5 m/s * 5 s = 52.5 m = dist. In more abbreviated form: a * `dt = `dv v0 + `dv = vf (vf + v0) /2 = vAve vAve * `dt = `ds so `ds = (vf + v0) / 2 * `dt. **
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RESPONSE --> right
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17:12:26 What is the displacement `ds associated with uniform acceleration from velocity v0 to velocity vf in clock time `dt?
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RESPONSE -->
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17:14:27 ** Since accel is uniform vAve = (v0 + vf) / 2. Thus displacement is `ds = vAve * `dt = (v0 + vf) / 2 * `dt, which is the first equation of uniformly accelerated motion. **
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RESPONSE --> right... didnt understnad what the question was about. If the acceleration is uniform vAve = initial velocity plus final velocity all divided by 2 and thne you can plug this in to 'dt * the answer which gives you 'ds
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17:18:13 Describe the flow diagram we obtain for the situation in which we know v0, vf and `dt.
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RESPONSE --> ??
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17:20:46 ** The first level in the diagram would contain `dt, v0 and vf. Then v0 and vf would connect to `dv in the second level. The second level would also contain vAve, connected from vf in the first level to v0 in the first level. The third level would contain an a, connected to `dv in the second level and `dt in the first level. The third level would also contain `ds, connected to vAve in the fourth level and `dt in the first level. **
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RESPONSE --> Right all these levels connect because they can all be found using the terms that are given. You just have to manipulate the equations.
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17:21:18 Query Add any surprises or insights you experienced as a result of this assignment.
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RESPONSE --> I was helpful to see that by know a couple of things you are able to find a lot of different things.
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17:21:40 ** Student Response: I think I really confused what information stood for what in the Force and Pendulum Experiment. However, I enjoy doing the flow diagrams. They make you think in a different way than you are used to. INSTRUCTOR NOTE: These diagrams are valuable for most people. Not all--it depends on learning style--but most. **
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RESPONSE --> ok
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e[q` assignment #004 Ҡ̘Ww Physics I 02-04-2006 "