Experiment 3: Buoyant Force and Archimedes PrincipleIn this experiment, you will investigate the effect fluids have of the weight of submerged objects.Materials(1) 250 mL Beaker1 Catch Pan(1) 100 mL Graduated Cylinder(1) 250 g Hanging Mass(1) # 6 Rubber Stopper5 N Spring Scale Short StringVernier Caliper*Paper Towels*Water*You Must ProvideProcedure1. Use the Vernier caliper to measure the diameter and height of the 250 g hanging mass. Record the values in Table 2. 2. Place the 250 mL beaker on the catch pan. 3. Fill a 250 mL beaker to the brim with water. Be careful not to spill any water in the catch pan. If water does spill, use a paper towel to clean it up and make sure the beaker is completely full of water. 4. Tie one end of a string to the 250 g hanging mass and the other end to the spring scale. Suspend the hanging mass in air and record its weight in Table 3. 5. Slowly submerge the hanging mass under water being careful not to let the hanging mass touch the sides or bottom of the beaker. The water will overflow into the catch pan. 6. Try to keep your hand as stable as possible to keep the hanging mass stationary in thewater. Record the weight of the mass in water in Table 3. 7. Slowly raise the mass out of the water. Be sure not to spill any extra water into the catch pan. Set the hanging mass down away from the catch pan and remove the beaker from the catch pan. 8. Carefully pour the water into the 100 mL graduated cylinder and record the volume ofdisplaced water. Dry off the catch pan to be used again. 9. Repeat Steps 2 - 8 for the rubber stopper. © 2014 eScience Labs, LLC.All Rights ReservedTable 2: Dimensions of 250 g Hanging MassDiameter (cm) Height (cm)1.5 5.5Table 3: 250 g Hanging Mass Buoyancy DataObjectWeight in Air(N)Weight inWater (N)BuoyancyForce (N)VolumeDisplaced (mL)250 g HangingMass 3.1 N 2.6 N -.05 65 mLRubber Stopper .3 N 1 N .0784 8 mL Post-Lab Questions1. What happens to the apparent weight when the objects are submerged in water?The apparent weight is the true weight minus the buoyant force. It is less than the true weight, hence we can say that it decreases.2. Use the value of the buoyant force to calculate an experimental value of the volume of all of the objects in kg/m3 (Fb = ρLVD g). Show your work.250 g mass-0.05 = 1000 * V * 9.8V = -0.05/ 9800V = 5.102 x 10^-6 m^33. Use the measured dimensions of the 250 g mass to calculate the volume of the mass,Show your work.V = A* hV = 0.015^2*0.055 = 1.24*10^-5 m^3© 2014 eScience Labs, LLC.All Rights Reserved4. Determine the percent difference between the measured volume of the cylinder and the value calculated from the buoyant force measurement. Show your work.% difference = (1.24 x 10^-5 - 5.102 x 10^-6)/5.102 x 10^-6 = 1.43%5. Using the fact that 1 mL = 1 x 10-6 m3, compare the volume of the displaced water to the calculated volume of the mass from Post-Lab Question 3 with a percent differencecalculation. Show your work.Volume of displace water as given , Calculate volume of mass , = 12.4Percentage error = =424.19%6. Are the experimental values of the volume of the 250 g mass (from Archimedes’ Principle) larger or smaller than the calculated value using the caliper measurements?Why? Which of the three values for volume is more accurate? Which of the two experimental volumes are more accurate? Explain.Experimental value = 5.102Measured value = 12.4Experimental value is much smaller than the measured volumeValue taken by direct measurement is more correct because it is not obtained by interpreting other concepts or principle; it is directly taken from instrumentAmong the two experimental values direct measurement value is more correct.7. Use the true weight and experimental volume of the rubber stopper to calculate the density of the cylinder, . Show your work.© 2014 eScience Labs, LLC.All Rights Reserved8. Look up the density of rubber and compare your measured value of the density with the values listed. Density of rubber = 1200 kg/m^39. Does the data support Archimedes’ Principle? Why or why not?Yes the data must be in agreement with the Archimedes' principle.The reason why a buoyant forces acts upwards on an object that is submergedin water is because the object's weight is pushing it downwards. This is scientifically called displacing.10. Identify two possible sources of error in the experiment? How could the procedure berevised to remove these potential errors?© 2014 eScience Labs, LLC.All Rights
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