Assignment 2 quiz

course phy 201

september 8,2009 around 6 pm

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 standard deviation of a set of numbers is calculated by taking the square root of the square of that set.

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:

In the processes of fitting a straight line to a graph of y vs. x data is to find the points that are most closely to the number of data. It is possible that more then two straight lines are form in a particular graph in that case will encounter the one which is more close to the data points.

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:

The total displacement of the object divided by the total time taken by the object is called the velocity.

Velocity = displacement/ time

As rate is a change in something divided by a change in something else. So in case of velocity the change in distance divided by change in time we are fulfilling the definition of the rate so we can say that velocity is an example of rate.

confiden ng: 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):2

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

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Your solution:

As average speed is = distance /time so, in case of finding the distance we will rearrange the equation as following:

Distance = Average 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):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:

By dividing the distance with average speed as following:

Time = distance/ 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):3

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

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Your solution:

By dividing the distance with time interval.

Average 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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&#Good responses. Let me know if you have questions. &#