Physics Query 1

course Phy 121

9/15 9

ph1 query 1*********************************************

Question: `qExplain in your own words how the standard deviation of a set of numbers is calculated.

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Your solution:

The standard deviation of a set of numbers comes from taking the square root of the average of all the squared deviations of those numbers in the set from their mean.

confidence rating: 3

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Question: 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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Your solution:

First you need to guess at a best fit line and from that take the farthest coordinate from the left of the line and the farthest from the right of the line. Then find the slope between these two points and then guess at the vertical intercept. Plug all these numbers into the y = mx + b and you have your equation.

confidence rating: 3

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Question: Briefly state what you think velocity is and how you think it is an example of a rate.

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Your solution:

Velocity is represented as distance divided by time and this is a prime example of a rate. To find velocity, you are finding how far something travels in a certain amount of time which is finding the rate at which it is moving.

confidence rating: 3

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Given Solution:

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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Self-critique (if necessary): OK

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

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Your solution:

If you have average speed and the time it took, then just multiply the speed by the time and you will have the distance moved.

confidence rating: 3

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Given Solution:

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

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

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Self-critique (if necessary): 3

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

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Your solution:

All you have to do is divide the distance moved by the average speed.

confidence rating: 3

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Given Solution:

** 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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Self-critique (if necessary): OK

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

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Your solution:

All you have to do is just divide distance moved by the time interval.

confidence rating:: 3

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Given Solution:

** 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. **

&#Your work looks very good. Let me know if you have any questions. &#