Lab 10 - Mechanical Equivalent of Heat

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School

Dallas County Community College *

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1415

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Mechanical Engineering

Date

Dec 6, 2023

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docx

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Lab 10: Mechanical Equivalent of Heat Name: _______________________________ _ Mechanical Equivalent of Heat In this virtual lab activity, we will obtain an experimental value for the mechanical equivalent of heat. We use the term mechanical equivalent of heat for the conversion factor or the equivalence between kilocalorie and Joule, and the accepted value for it is 4184 J/kcal. Click on the following link to access the simulation we need for this lab: http://www.thephysicsaviary.com/Physics/Programs/Labs/MechanicalEquivalentOfHeatLab/ 1. Click on “Begin”. Write down on the Experimental Data section the following values: initial temperature T i (upper left of the screen), volume of water V in the calorimeter (container in center of screen), mass of hanging mass m h (upper right of the screen), and initial height H of the hanging mass (measured at bottom of hanging mass). 2. Click on the “Start” button and wait for the hanging mass to arrive to its lowest final position (which should be 0 m). 3. Write down the final temperature T f (upper left of the screen). 4. Calculate the mass of the water m w by using the equation m w = (V)(1 g/mL), where 1 g/mL is the density of water. Convert this value to kg and write it down in the Experimental Data section. 5. Calculate the heat transferred to the water Q w using the equation Q w = m w c w (T f – T i ), where c w is the specific heat of water c w = 1.00 kcal/kg  °C. Write this value in the Experimental Data section. 6. Calculate the initial potential energy of the hanging mass U i using the equation U i = m h gH , where g = 9.81 m/s 2 . Write this value in the Experimental Data section. 7. Obtain your experimental value for the mechanical equivalent of heat MEH exp by using the equation MEH exp = U i /Q w . Write this value in the Experimental Data section. AGB_DallasCollege

Lab 10: Mechanical Equivalent of Heat Name: _____________________________________ EXPERIMENTAL DATA Initial temperature T i = ___________________ °C Volume of water V = _____________________ mL Mass of hanging mass m h = _____________________ kg Initial height of hanging mass H = ____________________ m Final temperature T f = _______________________ °C Calculated quantities: Mass of water m w = __________________ kg Heat transferred to water Q w = _________________ kilocalorie Initial potential energy of the hanging mass U i = _____________________ Joule Experimental value for mechanical equivalent of heat MEH exp = ___________________ J/kcal AGB_DallasCollege

Lab 10: Mechanical Equivalent of Heat Questions 1 . The accepted value for the mechanical equivalent of heat is 4184 J/kcal. Calculate the percent of error of your experimental value for the mechanical equivalent of heat MEH exp relative to the accepted value. 2a . If this experiment was conducted in the real world, what would be one of the main sources of error? 2b . If this experiment was conducted in the real world, would the experimental value for the mechanical equivalent of heat be larger or smaller than the one obtained in this virtual experiment? Explain. AGB_DallasCollege

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