assignment 1

course phy 231

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001.

Physics I

01-27-2008

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10:06:07

Explain in your own words how the standard deviation of a set of numbers is calculuated.

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RESPONSE -->

the standard deviation is obtained by subtracting the mean from each of the samples or numbers used.

confidence assessment: 3

the standard deviation is the square root of an average of the squared deviations from the mean

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10:15:36

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 -->

still abit unsure of this

confidence assessment: 0

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10:17:24

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 rate of change in a position. as it is a change from one point to another, rate deals with the relationship between these points.

confidence assessment: 3

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10:23:06

Given average speed and time interval how do you find distance moved?

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RESPONSE -->

speed is divided bythe time interval to get the distance moved

confidence assessment: 3

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10:23:48

** You multiply average speed * time interval to find distance moved.

For example, 50 miles / hour * 3 hours = 150 miles. **

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RESPONSE -->

again i forgot to multiply to find the average for distance.

self critique assessment: 2

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10:26:11

Given average speed and distance moved how do you find the corresponding time interval?

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RESPONSE -->

distance divided by speed would give you the time interval

confidence assessment: 3

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10:26:59

Given time interval and distance moved how do you get average speed?

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RESPONSE -->

distance divided by time would give you the avergae speed

confidence assessment: 3

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Review this and be sure you understand everything. If you still have questions, please sUbmit them.