Lab Assignment 1 Jerry Fu

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Virginia Tech *

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2216

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Mechanical_engineering

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May 31, 2024

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1.2. Activity: Measuring the Specific Heat of Brass In this activity, you will determine the specific heat of brass by placing hot brass into room- temperature water and measuring the temperature changes in both the brass and water. Procedure 1.2.1. Navigate to the window for the Lab 1a.cmbl LoggerPro experiment file. The workspace displays atemperature vs. time graph. 1. Click the Data Collection Button [ and set the Duration field to 120 seconds. Ensure the "Continuous Data Collection" box is unchecked. Pick up the brass cylinder and two insulating cups at your station, go to the counter in the back of the room, and do the following: 1. Using the digital scale, measure the mass of the brass cylinder. s of walr (wg> 00702 Mass of Brass Cylinder: 0.0 S_’ s (kg) 2. Pour a mass of room-temperature water equal to the mass of the brass cylinder into one insulating cup (Cold Cup). 3. Fill the second insulating cup (Hot Cup) with enough hot water to fill it halfway. Return to your station and do the following: 1. Place Probe 1, labeled "TP 1", in the Cold Cup. 2. Usingtongs, put the brass cylinder in the Hot Cup. (If the brass is not completely immersed, return to the back counter and add more hot water to the Hot Cup.) 3. Keepthetong tips immersed in the hot water. 4. Place Probe 2, labeled "TP 2", in the hole in the center of the brass cylinder. In LoggerPro, begin collecting data from the temperature probes by clicking the Collect Button ll. 1. Wait ten seconds and then use the tongs to lift both the brass cylinder and Probe 1 out of the Hot Cup and place them into the Cold Cup. Don't let the tongs contact the water in the Cold Cup. Lab 1: Heat and Internal Energy 1-4 B e NG

1. Click on the plot you want to annotate. 2. Then,click Insert in the top menu bar and choose Text Annotation. An annotation box will appear on the graph. 3. If you need to move the annotation box or its line, hover the mouse over it until the ¥ cursor appears. Then, click and drag the box to the desired location. 4. Screenshot your plot. Take a screenshot of your plot using the Snipping Tool in Windows and save the screenshot to the Downloads folder. Include this screenshot in your assignment submission. Question 1.1: Use either the Statistics ¥2 or Examine Tool f to measure the following quantities from your temperature vs. time plot. (To apply the Statistics Tool to a specific region of a plot, first click and drag the cursor across that region, which will highlight it in grey. Then click the Statistics Tool.) Initial temperature of the room temperature water: 2 ' . S L) Final temperature of the water: 1.1 (ce) Initial temperature of the brass in the hot water: 4 L 6 (°C) Final temperature of the brass: 2 ”l 2E) _ "T?*"E

— Question 1.2: Calculate the specific heat of brass using your temperature and mass ' measurements. Show your work. (The specific heat of water is cyqter = 4186 J/kg°C) M= 06§ ]2 Co.0512) (1 Lo oI 4 (-23.1) Speatic hut of M&:}()Sq.oﬂld/ I(JOC Question 1.3: Compare the value you calculated in Question 1.2 with the known specific heat of brass: cprass = 385 J/kg°C. If there is a discrepancy, discuss it and its possible sources. ( Clmss -‘—355\)/6"( The ettt [OM'A [‘m'(, Ao the ‘&"Td""{"? s '“f —faanqts ‘fou&"@ . all ‘ Boin sl DAL

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Question 1.4: When you transferred the brass from the Hot Cup to the Cold Cup, we instructed you not to let the tongs contact the water in the Cold Cup. Explain why thiswas a necessary step for this experiment. %B i a mw(fir 4 +th hat o~ e fwys 0({0(9"( Flt‘[(({ e menrrnd. T vt dd ke led e htd i A Tangs uckd #e Vet Lab 1: Heat and Internal Energy 1-8

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Massoflce: 2.6 5 0' (kg) 2. Add enough room-temperature water to the insulating cup so the cup is about = full. S 3 Use a digital scale to measure mass of the water. Record that value below. Mass of Water: 0.7 b (kg) Return to your station and do the following: ’ 3. Close the open end of the metal container with the rubber stopper. | 4. Thread Probe 1 through the hole in the stopper. Ensure the probe extends about % ' into the container. It should be in contact with the ice but not with the bottom of the container. 5. Place Probe 2 in the room-temperature water in the insulating cup. In LoggerPro, begin recording data by clicking the Collect Button ] 6. Place the metal container with Probe 1 into the water in the insulating cup. 7. Continuously but gently stir the water in the cup using Probe 2. | 8. When the ice and the water reach thermal equilibrium, stop data collection by clicking | the Stop Button | = | Clean up your station by e emptying the water from the metal container and cup into the sink at the front of the room and e placing the metal container and rubber stopper ona dry paper towel at your station. Modify, annotate, and save the plot by doing the following: Scale your plot automatically by clicking on the Auto Scale Button EA or manually by using the Graph Options window. 2. Label your plot using either the Graph Options window or Insert>Text. | 3. Annotate your plots using Insert>Text Annotation. Indicate o Which curve represents the temperature response of the ice, | o Which curve represents the temperature response of the water, and y o When you placed the metal container into the water in the cup. Take a screenshot of your plot using the Snipping Tool in Windows and save the _- screenshot to the Downloads folder. Include this screenshot in your assignment 3 submission.

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Question 1.5: How do your predicted and measured temperature vs. time plots compare? If there are discrepancies, discuss them. Was there anything wrong with your assumptions or reasoning? Explain. |\/\7 Prod{tb‘m was d(,)() Lué W st -H»’? Al il Th a(faal PL% wAS s)iJW/ poty cotwdl whk Wmike ws B live il A om0, e i bt it

Question 1.6: Use either the Statistics Y or Examine Tool K to measure the following guantities from your temperature vs. time plot. (To apply the Statistics Tool to a specific region of a plot, first click and drag the cursor across that region, which will highlight it in grey. Then click the Statistics Tool.) Initial temperature of the ice in the metal container: 0. 3 (CC) Initial temperature of the water in the insulating cup: 45. 5 (°C) Final temperature of ice/water in the metal container: 2 | (°C) Question 1.7: Calculate the latent heat of fusion for ice using your data. Show your work. (The specific heat of water is ¢ yqser = 4186 1/kg°C) ’__)(/Z. 0.2b Oyj 486- (7). (- 0.3) :m ‘W(ﬂ

Question 1.8: Explain how your mathematical procedure is consistent with the temperature- versus-time plot for the ice and water. (For instance, are there any differences between the temperature responses of the ice and the water? If so, how are these differences reflected in your calculations and the equations you chose to use?) M*I (a’m‘a'fi‘h) Plblx-u( a SLMr Question 1.9: Compare the value you calculated in Question 1.7 with the known latent heat of fusion for ice: L, yater = 3-35 X 10°J/kg. If there is a discrepancy, discuss it and its possible loss than e g [ sources. M/ Nsalt Tl‘\l A‘SC'TT(M(\/ [M’/ 17( AAe b th L ptrant ’7 h, (;crcnw{/ Prewncturely. ﬂ\"‘ ) 5‘60?])”/ -é,%@ 7 in (MSU'finc)()' &M ‘a( ‘fw,,rm{,\m ey mstead ot l‘)«um ent>rs AArfi the €>?C\‘f*l»'(. ‘ﬂaé l‘laf v’F —f;{.‘». ‘ i /4-13 FANN |

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I £029-Cey

Lab Assignment 1 Jerry Fu

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