query 1

course phy 201

ph1 query 1vvvv

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

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Your solution: the first thing you do is take the average then you then you act like the number is on the zero on the number line to find the positive and negative deviation. After you get your deviations square the numbers so the numbers will be positive. Next you take the sum of the numbers and divide it by on one less than the than the number of deviations then you take the square root.

confidence rating:

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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:

You have to find the line of best fit which is not always as easy as it sound. One person might see it one way while somebody else might see it a different way so come up with 2 different lines of best fit for the same set of points.

confidence rating:

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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 how fast and in what direction an object is going the reason velocity is a rate of change is because it’s the change in distance/change in time

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):

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

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Your solution: distance = speed *time

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):

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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: to find time you take distance / 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):

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

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Your solution: speed = distance / time

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. **

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