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Note for PHYS 1101 with Professor Wood at UH

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This 2 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Houston taught by a professor in Fall. Since its upload, it has received 17 views.

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Date Created: 02/06/15
PHYS 1101 Rotational Dynamics Exp 6 STEP 11 11 In this last part you will use the computer to acquire the data used to calculate the acceleration Open activity Rotational Dynamics Release the disk click Start and after ve seconds click Stop The Data window should indicate that Run 1 is available for processing Use the angular position data to create a data set for displacement X Click on the Calculate button at the top of the screen In the Calculator window click on New type X deg 400360 under De nition Click Accept You should now be asked to de ne the variable deg To define deg simply click where it says Angular Position in the Data window drag and drop it where it says Please de ne variable deg under Variables If you see a rectangle enclosing the phrase Please de ne variable deg when the data is dragged it is ok to drop the data To set the units of X click Properties in the Calculator window then type mm under Units and under Variable Name erase Y and type X Click OK We now need to nd the instantaneous velocity as a function of time In the Calculator window click on New and under de nition type dX Xlast1X and click Accept If you are asked to de ne the variable X drag it to where it says Please import the variable X under Variables To set the units of dX click Properties in the Calculator window then type mm under Units and under Variable Name erase Y and type dX Click OK Similarly we are going to create the variable dt Click on New in the Calculator window Type dt tlast1t under de nition and click Accept If asked to de ne the t click on t timeofX in the Data window and drag it to de ne the variable To set the units of dt click Properties in the Calculator window Click on the drop down button besides Variable Name and select Y erase it and type dt then type s under Units Click OK Create the variable v by clicking New in the Calculate window and typing v dXdt under Definition To set the units of v click Properties in the Calculator window click the button besides Variable Name and select Y erase it and type v then type mms under Units 4 77 S Then click the button again this time select X erase it type time Then type under Units Click OK To plot the graph of V vs t drag v dXd on the Data window and drop it on Graph in the Display window The graph should be a straight line Eliminate the line connecting the data points by clicking Display on the menu at the top of your screen and selecting Settings Uncheck the box that says Connect Data Points and click OK You can expect a bit of scatter but the data should lie along a reasonably straight line Click Fit on the graph window and select Linear Fit a small window will appear with information the values of the tting parameters If you did not stop data collection soon enough there will be an obvious bend in the data In that case use the mouse to highlight the interval of data that you want to consider and then use Linear Fit Write down the value of the slope and print your graph showing the least squares t obtained and the vale of the parameters Slope What does this slope represents Using this slope determine the linear acceleration of the falling mass Show your work Acceleration of the falling mass Use equation 9 to nd the moment of inertia of the steel disk Show your work

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