course PHY 231 001. Physics I
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19:28:57 Explain in your own words how the standard deviation of a set of numbers is calculuated.
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RESPONSE --> Standard deviation is the square root of the variance of a set of different variables. confidence assessment: 3
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19:30:18 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 --> One must look at the points and decide if all the points are within a descent range of the average if not then it may be necessary to throw out some points, especially if they throw off your slope and intercepts significantly. confidence assessment: 3
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19:31:22 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 simply speed but with direction. confidence assessment: 3
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19:31:50 ** 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 undertand that the velocity is the change in distance divided by the change in time. self critique assessment: 2
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19:32:34 Given average speed and time interval how do you find distance moved?
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RESPONSE --> Simply multiply the average speed by the amount of time changed and you will get the distance traveled. confidence assessment: 3
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19:32:43 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
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RESPONSE --> understood self critique assessment: 3
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19:33:26 Given average speed and distance moved how do you find the corresponding time interval?
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RESPONSE --> Divide the distance moved by the speed of the object and you should get the time interval required for the object to move that distance. confidence assessment: 3
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19:33:37 ** 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 --> understood self critique assessment: 3
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19:35:30 Given time interval and distance moved how do you get average speed?
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RESPONSE --> Divide the distance moved by the time interval and you should get the average speed. confidence assessment: 3
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19:35:41 ** 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 --> Understood self critique assessment: 3
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