Lab 01 - Physics 7BLab 1 Thermodynamics(v.2.5)Page 1 NAME...

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Physics 7B—Lab 1: Thermodynamics (v.2.5)Page 1 NAME: _____________________ SECTION DAY/TIME: _____________________________ GSI: ___________________________ LAB PARTNER: ____________________________ Lab 1: Thermodynamic cycles and engines Introduction As presented in textbooks, heat engines and refrigerators can seem very theoretical. The point of this lab is thus to help you draw connections between abstract p V diagrams and real life. We want p V diagrams and cycles to make sense, both mathematically and physically. Equipment and useful information Cylindrical piston (Radius = 0.014 meters. Mass of piston & cup = 0.100 kg.) Beakers of hot and cold water. Ten 10-gram masses. Never put more than 100 grams onto the piston, or else air may leak out. Air pressure = 1.00 × 10 5 N/m 2 .
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Physics 7B—Lab 1: Thermodynamics (v.2.5)Page 2 Pre–lab Questions [Do 1a and 1b before coming to lab. Your GSI will initial these pre–lab questions when you arrive in lab.] 1. This question gives you a sense of the pressure differences we’ll see in this experiment. (a) When no masses are placed in the cup, what is the pressure of the air inside the piston? Show your work here. (b) When 100 grams are piled into the plate, what is the pressure of the air inside the piston? GSI Initials: ___________ The lab starts on the next page
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Physics 7B—Lab 1: Thermodynamics (v.2.5)Page 3 2. With everything at room temperature, place 100 grams in the cup. If necessary, remove the stopper from the air canister, let the piston slide down almost as far as it will go, and then replace the stopper (making it airtight!). We want the piston to start near the bottom. If the temperature of your hot water is below 50° C, scoop some hot water from one of the hot plates. If the water is boiling, dilute it with some cooler water in your beaker. The gas in the piston now corresponds to point a on this p V diagram. Here, you’ll figure out how to make the gas inside the piston undergo the cycle shown. Then, you’ll actually do it, and answer questions about each step.
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