course phy201 ÝzlvzزmwWassignment #001
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23:34:01 Explain in your own words how the standard deviation of a set of numbers is calculuated.
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RESPONSE --> I t is found by dividing the adding the squares of the difference from the mean and dividing them by the total minus one. confidence assessment: 1
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23:35:52 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 --> Using a string is a way to see a line of best fit and being able to judge theslope and the y intercept. confidence assessment: 1
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23:37:06 Briefly state what you think velocity is and how you think it is an example of a rate.
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RESPONSE --> veocity is the relationsip of matter to acceleration. making it the rate of acceleration to matter. confidence assessment: 1
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23:37:26 ** 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 --> ok self critique assessment: 1
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23:39:03 Given average speed and time interval how do you find distance moved?
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RESPONSE --> multiply time by the speed confidence assessment: 2
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23:39:15 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
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RESPONSE --> ok self critique assessment:
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23:40:49 Given average speed and distance moved how do you find the corresponding time interval?
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RESPONSE --> you can not find that information confidence assessment: 0
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23:41:33 ** 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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RESPONSE --> That was my guess but i second gusessed myself wrongly self critique assessment: 3
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23:42:11 Given time interval and distance moved how do you get average speed?
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RESPONSE --> distance/time interval confidence assessment:
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23:42:21 ** 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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RESPONSE --> ok self critique assessment:
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