course Phy 201 Would like to have feedback. Thanks, Joshua H¶w´ÂÍ«üäÔŸþ»I§æÊœ„EðæyäfXÜèúê°{assignment #001
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18:30:37 Explain in your own words how the standard deviation of a set of numbers is calculuated.
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RESPONSE --> Standard deviation is obtained by squaring the deviations from the mean of a given number samples and taking the square root of the average of the squared deviations. The average of the squared deviations is obtained by summing the squared deviations and dividing by one less than the total number of deviations unless the number is greater than 30. confidence assessment: 3
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18:34:54 Explain in your own words the process of fitting a straight line to a graph of y vs. x data, and briefly discuss the nature of the uncertainties encountered in the process. For example, you might address the question of how two different people, given the same graph, might obtain different results for the slope and the vertical intercept.
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RESPONSE --> Fitting a straight line to a graph of y vs x data is performed by eye balling the data points on the graph and place a line trying to keep the same average distance from the data points on the graph. The uncertainties come from the fact of estimations is due to error. Human error at that. Because of human error is the explanation as to why two people would come up with different results. confidence assessment: 3
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18:37:10 Briefly state what you think velocity is and how you think it is an example of a rate.
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RESPONSE --> Velocity is the time it takes to travel a distance. It is an example of rate because it is a measurement at which something happens in a certain time. confidence assessment: 3
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18:38:17 ** A rate is a change in something divided by a change in something else. This question concerns velocity, which is the rate of change of position: change in position divided by change in clock time. **
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RESPONSE --> I understand this statement in that rate is a change in something divided by a change in something else. self critique assessment: 3
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18:39:12 Given average speed and time interval how do you find distance moved?
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RESPONSE --> Speed multiplied by change in time would give the total change in distance. confidence assessment: 3
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18:39:38 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
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RESPONSE --> I understand this statement self critique assessment: 3
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18:40:33 Given average speed and distance moved how do you find the corresponding time interval?
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RESPONSE --> Distance divided by average speed would result in the corresponding time interval. confidence assessment: 3
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18:41:27 06-25-2008 18:41:27 ** time interval = distance / average speed. For example if we travel 100 miles at 50 mph it takes 2 hours--we divide the distance by the speed. In symbols, if `ds = vAve * `dt then `dt = `ds/vAve. Also note that (cm/s ) / s = cm/s^2, not sec, whereas cm / (cm/s) = cm * s / cm = s, as appropriate in a calculation of `dt. **
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NOTES -------> ** time interval = distance / average speed. For example if we travel 100 miles at 50 mph it takes 2 hours--we divide the distance by the speed. In symbols, if `ds = vAve * `dt then `dt = `ds/vAve. Also note that (cm/s ) / s = cm/s^2, not sec, whereas cm / (cm/s) = cm * s / cm = s, as appropriate in a calculation of `dt. **
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18:41:59 Given time interval and distance moved how do you get average speed?
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RESPONSE --> distance divided by time interval equals the average speed confidence assessment: 3
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18:42:10 06-25-2008 18:42:10 ** Average speed = distance / change in clock time. This is the definition of average speed. For example if we travel 300 miles in 5 hours we have been traveling at an average speed of 300 miles / 5 hours = 60 miles / hour. **
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NOTES -------> ** Average speed = distance / change in clock time. This is the definition of average speed. For example if we travel 300 miles in 5 hours we have been traveling at an average speed of 300 miles / 5 hours = 60 miles / hour. **
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