course Phy 201 ?????????:?????assignment #005
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18:27:53 Intro Prob 6 Intro Prob 6 How do you find final velocity and displacement given initial velocity, acceleration and time interval?
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RESPONSE --> vf = v0 + a * 'dt 'ds = v0 * 'dt + .5 * a * 'dt^2 confidence assessment: 3
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18:30:22 ** To find final velocity from the given quantities initial velocity, acceleration and `dt: Multiply `dt by accel to get `dv. Then add change in velocity `dv to init vel , and you have the final velocity**
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RESPONSE --> ok i stated the formula thats in a different way than this but it means the same thing. self critique assessment: 3
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18:34:59 Describe the flow diagram we obtain for the situation in which we know v0, vf and `dt.
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RESPONSE --> the rise between two graph points represents change in veloctiy the run between two graph points represents change in position the slope between two graph points represents average acceleration for the corresponding time interval the avergae graph altitude represents average velocity the width of a region beneath the graph represents the change in clock time the area of a region beneath the graph represents the change in position. confidence assessment: 2
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18:42:57 ** The flow diagram shows us the flow of information, what we get from what, usually by combining two quantites at a time. How we get each quantity may also be included. From vf and v0 we get `dv, shown by lines from vf and v0 at the top level to `dv. From vf and v0 we also get and vAve, shown by similar lines running from v0 and vf to vAve. Then from vAve and `dt we get `ds, with the accompanying lines indicating from vAve and `dt to `ds, while from `dv and `dt we get acceleration, indicated similarly. **
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RESPONSE --> Im not very good at a flow chart but they tell you what we get by combining two quantities at a time you can get the 'dv if you have vf and v0 and also the vAve. then from the vAve you get the 'dt and 'ds and from the 'dv and the 'dt you get acceleration. self critique assessment: 3
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18:56:01 Principles of Physics and General College Physics Students: Prob. 1.26: Estimate how long it would take a runner at 10 km / hr to run from New York to California. Explain your solution thoroughly.
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RESPONSE --> Well first to get the answer to this problem i had to know how many km it was from ny to california. then the time is the distance traveled / speed so 3961 km / 105m/h = 396.10hours approximation only because the problem did not state the exact distance from new york to california. confidence assessment: 3
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19:19:23 All Students: Estimate the number heartbeats in a lifetime. What assumptions did you make to estimate the number of heartbeats in a human lifetime, and how did you obtain your final result?
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RESPONSE --> Enter, as appropriate, an answer to the question, a critique of your answer in response to a given answer, your insights regarding the situation at this point, notes to yourself, or just an OK. Always critique your solutions by describing any insights you had or errors you makde, and by explaining how you can make use of the insight or how you now know how to avoid certain errors. Also pose for the instructor any question or questions that you have related to the problem or series of problems. I understand how the previous problem was answered i actually looked up the distance when i did the problem so i was off in my calculations a km = .62 miles. ok for this problem i used the idea that there are 33333333.33 minutes in a lifetime and the average heart beats 60 beats a minute so if you multiply the two together you get 2 * 10^9 beats in a lifetime. confidence assessment: 3
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19:22:28 ** Typical assumptions: At 70 heartbeats per minute, with a lifetime of 80 years, we have 70 beats / minute * 60 minutes/hour * 24 hours / day * 365 days / year * 80 years = 3 billion, approximately. **
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RESPONSE --> i did my calculations based on the number of minutes from the average life span it had the average lifespan listed in seconds in the book and i just turned the seconds back into minutes and then took an average of 60 beats per minute to obtain my calculations. self critique assessment: 3
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19:23:55 Add comments on any surprises or insights you experienced as a result of this assignment.
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RESPONSE --> Enter, as appropriate, an answer to the question, a critique of your answer in response to a given answer, your insights regarding the situation at this point, notes to yourself, or just an OK. Always critique your solutions by describing any insights you had or errors you makde, and by explaining how you can make use of the insight or how you now know how to avoid certain errors. Also pose for the instructor any question or questions that you have related to the problem or series of problems. I liked this assignment it makes you feel like you can figure out the world thru calculations. pretty neat. self critique assessment: 3
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