paraphrase three lab reports

19mvmn
timer Asked: May 6th, 2015

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i need you to paraphrase three lab reports. each report is a page and a half.Lab7.docxLab8.docxLab9.docx

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Torques and Rotational Equilibrium of a Rigid Body *Experimental Procedure: 1- Balance the meter stick in the knife-edge clamp and record the position of the balance point. 2- Select two different masses (100 grams or more each) and using the meter stick clamps and weight hangers, suspend one on each side of the meter stick support at different distances from the support. Adjust the position so the system is balanced. Record the masses and positions. 3- Place the same two masses used above at different locations on the same side of the support and balance the system with a third mass on the opposite side. Record all three masses and positions. 4- Replace one of the above masses with an unknown mass. Readjust the positions of the masses until equilibrium is achieved, recording all values. 5- Place about 200 grams at 90 cm on the meter stick and balance the system by changing the balance point of the meter stick. 6- With the 200 grams still at the 90 cm mark, imagine that you now position an additional 100 grams mass at the 30 cm mar on the meter stick. Calculate the position of the center of gravity of this combination (two masses and meter stick). *Results and Discussion: - Results are attached using collected data theoretically and experimentally. *Conclusion: In all of our calculations in this lab, our results were always within 2-3 percent difference with an average percent difference of 1.2%. This clearly indicates that our method of experimentation was quite accurate. Another reason for this level of accuracy is that there is very little room for error in order to get the ruler to balance without tipping towards either side. Nevertheless, there was still error. Even though the ruler is perfectly balanced and is not tipping on either side, the ruler rests at a slight angle - even though it is not moving at all. Using torque, we were able to complete this lab and all of the calculations it required from determining the center of gravity of a system of masses to the conditions for rotational equilibrium of a rigid body. The Pendulum *Experimental Procedure: 1. Assemble the ring stand by attaching the pendulum rod to the stand. 2. Using a ruler, hang one of the bobs so that it is 100 cm from the bottom of the pendulum rod to the top of the bob. Tighten the screw on the pendulum rod to hold it in place. 3. Pull the bob up to one side of the pendulum so that it forms a 10° angle with the pendulum rod. 4. Release the bob and immediately begin timing using the laboratory timer. Stop timing when the bob goes through two periods (when the bob returns to its original position the second time). 5. Record the time from the laboratory timer in a data table. 6. Repeat steps 2-5, each time subtracting 10 cm to the length of the string. Do this until you record a time for a length of 10 cm. Note the weight was 200g at all tries. 7. Repeat these steps from 2-5 with fixed length of 100cm with starting weight of (50-100-200-500). 8. Record the time from the laboratory timer in the second data table. *Results and Discussion: - Results are attached using collected data from both tables in excel sheets with graphs showing the frequency. *Conclusion: We were able to successfully test three different variables and analyze their effect on the period of the pendulum. The only significant trend we found was between length of the pendulum and period. Our data showed that as the length of the pendulum increased, the period of the pendulum also increased. We found absolutely no correlation between the period and the mass. Simple Harmonic Motion—Mass on a Spring *Experimental Procedure: 1. Hang the spring on the horizontal rod. 2. Adjust the height of the clamp on the vertical rod until the zero mark of the meter stick is aligned with the bottom of the hanging spring 3. Place a hooked mass M of 0.050 kg on the end of the spring. Slowly lower the mass M until it hangs at rest in equilibrium when released. 4. Repeat step 2 by changing masses on the spring and measuring the displacement y of the spring. 5. Record all values of M and y in Data and Calculations Table 1. 6. Amplitude Variation: Displace the mass downward and let it oscillate. Measure the time for 10 complete periods and record it in Data Table 2 as Dt. Repeat the procedure two more times for a total of three trials at this amplitude. 7. Repeat Step 6 by changing masses. Record all results in Data Table 2. 8. Mass Variation: Displace the mass 0.0500m below the equilibrium. Release it, and let the system oscillate. Measure the time for 10 periods of the motion and record it in Data Table 3 as Dt. Repeat the procedure two more times for a total of three trials with this mass. 9. Repeat the procedure of Step 8 with the same A but changing masses and record the results in Data Table 3. *Results and Discussion: - Results are attached from date collected during the experiment. *Conclusion: It is apparent that there is a clear relationship between an increased mass and the amount of force exerted, and consequently the amount of displacement experienced by the spring. Also it was proved to be accurate that the relationship between the period, mass, and the spring constant were in fact T=2π √m/k.
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