Names (LAST) ______, ______, ______NO MORE THAN THREE! Date: ___/___/______Block 1 2 3 4 5 6 7 8 Spring Semester – Lab Final Percent of Final Exam grade: Seniors, 100%; Juniors 50%

Rubric, Lab Final Prelab assignment: 70% Assigned item brought to class: 30%

Prelab: Show all work on this document. When finished, print double sided and turn in. All graphs (appropriately scaled, with dialogue boxes shown) should be electronically copied into this document. Do not print the data or post lab pages. 1. (20) A data table is attached. This is for the data collected when using a hand crank mixer. The radius of the crank arm was 0.16 m and the crank was turned once per second. a. (5) Graph this data using LoggerPro. b. (5) Calculate the area between the curve and the x-axis. What is the unit for the area under this plot? c. (10) Calculate the work done. Review the sections of the text on work, especially those that deal with graphing force vs. position. How “far” did you crank [apply a force] in one minute?

2. (20) A data table is attached. This is data collected for the electric mixer. The potential was 120 V. a. (5) Graph this data using LoggerPro. Stop at 2160 s. b. (5) Determine the area between the curve and the x-axis. What units is Ampere equivalent to? What units is Volt equivalent to?What is the unit for the area under this plot? c. (10) Calculate the work done. What is the unit for work?

3. (10) Compare and/or contrast the work done by the two differing machines. Explain any differences, including where the excess energy goes.

4. (5) What type of energy is utilized by: a. The hand crank mixer? b. The electric mixer?

5. (5) Determine how the ice cream froze: slowly or suddenly. Explain how you know this. Explain why this happens in this way. a. Slowly or suddenly? b. How you know? c. Why this happens?

6. (5) Salt was added to the ice surrounding the mixing tub. a. What effect did the salt cause? Look up “colligative property”. Spark Notes is good. b. Why is this effect important?

7. (5) The freezing of the ice cream mixture, as all freezing events, is an exothermic process. a. What does exothermic mean? b. What were the surroundings that absorbed this energy? c. What physical change in the surroundings absorbed this energy?

00d8b28166ddb2e5864e059bbc78141e.doc 5/9/2011 09:10:00 AM Page 1 of 2 Names (LAST) ______, ______, ______NO MORE THAN THREE! Date: ___/___/______Block 1 2 3 4 5 6 7 8 Data Hand Crank: Electric: Time Force Time Current Notes minutes Newtons minutes Amperes 0 5.0 0 1.80 1 5.2 1 1.80 2 5.5 2 1.75 3 5.5 3 1.80 4 5.5 4 1.80 5 5.7 5 1.85 6 5.7 6 1.85 7 5.7 7 1.85 8 5.7 8 1.85 9 5.8 9 1.85 10 6.0 10 1.85 11 6.0 11 1.80 12 6.0 12 1.80 13 6.2 13 1.80 14 6.4 14 1.80 15 6.5 15 1.80 16 6.6 16 1.80 17 6.8 17 1.80 18 7.3 18 1.85 19 8.0 19 1.80 20 10.0 20 1.85 21 12.0 21 1.80 22 14.0 22 1.85 23 14.0 23 1.85 24 15.0 24 1.85 25 15.2 25 1.85 26 15.2 26 1.90 27 16.0 27 1.90 28 18.0 28 1.90 29 18.5 29 2.00 30 19.0 30 1.90 31 20.0 31 2.10 32 2.20 33 2.20 34 2.40 35 2.50 36 2.80 37 3.50 Motor Stalled

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