Assign1  Open Query

course phy 201

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:

We find the mean of a sample, then take the individual numbers and find how much they differ from the mean. We take these numbers and square them, then divide them by the total number of individuals – 1. the square root of this is the standard deviation.

Confidence Assessment: 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:

Confidence Assessment:

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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 far you travel in a given amount of time. It is a rate because it is the distance traveled per unit of time (one quantity divided by another)

Confidence Assessment: 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. **

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:

We multiply the average speed and time interval

Confidence Assessment: 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. **

Self-critique (if necessary): ok

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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:

We divide distance by the average speed

Confidence Assessment: 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?

Your solution:

We divide distance by the time interval.

Confidence Assessment: 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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