course PHY 121 Recieved a run script error in this assignment. Any idea what that is about?
.................................................yﲽKʫzV˒ݴƐassignment #001
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17:30:13 Explain in your own words how the standard deviation of a set of numbers is calculuated.
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RESPONSE --> In the spread of numbers, the SD is found by taking the minimun and maximum numbers and finding how far from the mean they are. By taking the square root of the sum of the difference between the observed and expected squared we are able to get the standard deviation. confidence assessment: 3
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17:30:50 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 --> Without the use of a regression line from a word processor, fitting a straight line means eyeballing what is guessed to be the line which runs through a set of points and is on average an equal distance from all points. The slope, vertical, and horizontal alignment of the line could change the best fit and will not be very accurate. confidence assessment: 3
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17:32:38 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 movement of an object with respect to direction, speed, and time. They relate in that velocity is computed by differences in rates. confidence assessment: 3
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17:32:48 10-09-2007 17:32:48 ** 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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17:33:19 Given average speed and time interval how do you find distance moved?
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RESPONSE --> Speed multiplied by time will give distance. confidence assessment: 3
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17:33:30 10-09-2007 17:33:30 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
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17:34:07 Given average speed and distance moved how do you find the corresponding time interval?
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RESPONSE --> Divided distance by speed to find time. confidence assessment: 3
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17:34:13 10-09-2007 17:34:13 ** 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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17:35:05 Given time interval and distance moved how do you get average speed?
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RESPONSE --> Time multiplied by distance will give speed. confidence assessment: 3
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17:35:15 10-09-2007 17:35:15 ** 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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