course Phy 201 êÖ¡wxÆÇžô—–¿¬IÒ‘òå¦Û´±÷’›Ûassignment #001
......!!!!!!!!...................................
17:35:21 Explain in your own words how the standard deviation of a set of numbers is calculuated.
......!!!!!!!!...................................
RESPONSE --> You take the deviations from the mean of each of the samples. You then square these deviations. You then average these deviations by dividing by one less than the total number of samples. You then take the square root of this answer confidence assessment: 2
.................................................
......!!!!!!!!...................................
17:37:07 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.
......!!!!!!!!...................................
RESPONSE --> You want a line that doesn't necessarily have to intesect any points but should have the slope closest possible and should intersect the y axis as close to the actual as possible. There are many uncertainties such as estimating the acutal points on the graphs. two people might say that the x point and the y point of a certain point are different. confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:37:40 Briefly state what you think velocity is and how you think it is an example of a rate.
......!!!!!!!!...................................
RESPONSE --> I think velocity is the average rate or speed of an object. This is rate because it is a change in distance over a change in time confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:37:53 ** 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. **
......!!!!!!!!...................................
RESPONSE --> ok self critique assessment: 3
.................................................
......!!!!!!!!...................................
17:38:38 Given average speed and time interval how do you find distance moved?
......!!!!!!!!...................................
RESPONSE --> d=rt given r multiply by the time interval. this will give you distance traveled confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:38:45 06-08-2008 17:38:45 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
......!!!!!!!!...................................
NOTES -------> ok
.......................................................!!!!!!!!...................................
17:38:47 ** You multiply average speed * time interval to find distance moved. For example, 50 miles / hour * 3 hours = 150 miles. **
......!!!!!!!!...................................
RESPONSE --> self critique assessment: 3
.................................................
......!!!!!!!!...................................
17:39:07 Given average speed and distance moved how do you find the corresponding time interval?
......!!!!!!!!...................................
RESPONSE --> d=rt divide distance by speed and you will get time interval confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:39:14 ** 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. **
......!!!!!!!!...................................
RESPONSE --> ok self critique assessment: 3
.................................................
......!!!!!!!!...................................
17:39:29 Given time interval and distance moved how do you get average speed?
......!!!!!!!!...................................
RESPONSE --> divide distance by time and you will get speed or rate confidence assessment: 3
.................................................
......!!!!!!!!...................................
17:39:34 ** 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. **
......!!!!!!!!...................................
RESPONSE --> ok self critique assessment: 3
.................................................