Lab 5 - Pressure

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Community College of Denver *

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105

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Mechanical Engineering

Date

Dec 6, 2023

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pdf

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Lab 5 – Under Pressure N ame: _____________________ Objective Determine the relationship between pressure, depth, and density via simulation. Using this knowledge, the density of an unknown fluid will be determined. Submission This lab will be a remote lab, to be submitted under the assignments page on D2L AS A SI N GLE PDF DOCUME N T . For submission, you have a couple options: 1. Complete this worksheet on your computer, filling in each section through a Microsoft Word editor or marking it up with a PDF editor, or whichever digital method is most convenient. 2. Print out this sheet, write up the lab as usual, then scan with a phone app or other scanner and submit. 3. If you have no printer or laptop, you can view the assignment and complete on a separate blank sheet of paper (clearly labelling each section you are answering), then scanning with your phone or scanner and submitting. Materials and Setup 1. Open the “Under Pressure” PHET Simulation - https://phet.colorado.edu/sims/html/under-pressure/latest/under-pressure_en.html 2. Explore the simulation’s controls. 3. Select the “Reset” button on the bottom right. 4. Select the “Grid” option on the top right. 5. Using the pump, fill the water up to the 0-meter reference line noted on the Grid. Instructions 1. Use pressure gauge to measure the pressure in the water at every 0.50 m from the surface to the bottom. Record your results on the table below. Convert your measurements to Pascals (use scientific notation). p = E directly Purpotional to F ↓ weight of flood indirectly p . to A 9 , 8 ~quavity nowe it und density flurtical n p = po + Pg po= 101KPA . Puree W

Depth (m)Pressure (Pa = N/m 2 ) 2. Use Excel, or similar, to make a graph of pressure vs depth. Do a linear best fit and include the equation on the graph . Copy and paste your graph and equation found from this linear best fit below. a. What is the physical meaning of the slope? _____________________________________________________________________ _____________________________________________________________________ b. What is the physical meaning of the y-intercept? _____________________________________________________________________ _____________________________________________________________________ 3. Now, pick a depth and vary the fluid density from 700 to 1,400 kg/m 3 . Record your results on the table below. Note that the simulation will give you kPa. Once again, convert to Pascals before entering the values on the table and use scientific notation. My chosen depth was: ______ . Density (kg/m 3 )Pressure (Pa = N/m 2 ) Slope reprents a trend in pressure. As we get deeper, pressing increases Atmospherical pressure S We I - 2 d

4. Use Excel, or similar, to make a graph of pressure vs density. Do a linear best fit and include the equation on the graph . Copy and paste your graph and equation below. a. What is the physical meaning of the slope? _____________________________________________________________________ _____________________________________________________________________ b. What is the physical meaning of the y-intercept? _____________________________________________________________________ _____________________________________________________________________ 5. How would your two graphs differ if you gathered data from Mars? Jupiter? Make a prediction below before adjusting the simulation. Prediction: _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 6. Now, change the acceleration due to gravity. Interpret the results – how does this compare with your prediction? Results and Interpretation: _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 7. Click on the icon with the question mark on the sink to access the mystery fluid portion. Determine the density of a mystery fluid. If your last name starts with A-H, test Fluid A. If your last name starts with I-N, test Fluid B. If your last name starts with O-Z, test Fluid C. Describe your method and results below. _____________________________________________________________________ _____________________________________________________________________ Atmospherical pressure How pressure changes with density. Increase of pressure when we have an increase of pressure For number 5, I was correct. The change in atmospherical pressure, would change depending on the velocity different planets had compared to earth. Which causes a change in slope. S ~ our graphs world differ if information was gathered from Mars or Jupiter due to a diffrence in atmospherical pressure (increase or decreases Change in slope of graph

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_____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ Density Results: ________________kg/m 3 8. Based on what you learned in this activity, what is the formula for determining the pressure in a fluid? State what each of the symbols mean. _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ (Credit – this lab was adapted from: Palmquist, B. (2018). PhET Interactive Simulations. Retrieved October 07, 2020, from https://phet.colorado.edu/en/contributions/view/4747 ) 2 e = -PA equation used Fluid C 1174 Food pressure ; Prot leptnl Inlight ot Atmosphere - artical distance pressure = density - D C - n I = 10 +1 un gravity po 101 KPA + 101 , 000 Pa g 9 81 = 10 m/s