course PHY201 wmւ~Tassignment #001
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15:46:37 Explain in your own words how the standard deviation of a set of numbers is calculuated.
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RESPONSE --> First you must calculate the mean of your recorded values, then you must calculate your deviations for each of your values from the mean. Next, you square each deviation value and then add them together. After that, you divide the sum of the squared deviations by the number of values minus 1. Once you find the result of that calculation, you take the square root of this result which will yield you the value for standard deviation. confidence assessment: 3
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15:54:21 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 --> By looking at a graph determine your best line of fit for the graph and then draw it across the graph. Take your leftmost and rightmost points and use them to determine rise and run. Rise can be found using: Y2 - Y1. Run can be found using X2 - X1. Then take your values and plug them into this equation: Rise / Run, to determine you slope: m. Next estimate you y-axis intercept of your line and record the value as b. Next plug them into the formula: y = mx + b. This the equation for your line. Verify it by plugging in one of your points in the respective X and Y places in the equation and solve for b. How do your estimations compare? Also, remember that each person may interpret an different line of best fit, so results from person to person may vary. confidence assessment: 3
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16:02:04 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 rate of change of position along a straight line with respect to time. It is an example of a rate because it can be measured as average velocity or instantaneous velocity. confidence assessment: 2
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16:02:24 ** 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 --> okay. self critique assessment: 3
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16:03:16 Given average speed and time interval how do you find distance moved?
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RESPONSE --> You will multiply the avg speed by the time interval to find the distance moved. confidence assessment: 3
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16:03:39 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
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RESPONSE --> okay self critique assessment: 3
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16:04:32 Given average speed and distance moved how do you find the corresponding time interval?
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RESPONSE --> You will divide the distance by average speed to find the time interval. confidence assessment: 3
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16:05:07 ** 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 --> okay self critique assessment: 3
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16:06:21 Given time interval and distance moved how do you get average speed?
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RESPONSE --> Average speed is calculated by dividing the distance by the time interval. avg s = d / t confidence assessment: 3
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16:06:32 ** 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 --> okay self critique assessment: 3
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