Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 23, Problem 7PLA
A 250.0 g sample of metal shot is heated to a temperature of 98.0°C. It is placed in 100.0 g of water in a brass calorimeter cup with a brass stirrer. The total mass of the cup and the stirrer is 50.0 g. The initial temperature of the water, stirrer, and calorimeter cup is 20.0°C. The final equilibrium temperature of the system is 30.0°C. What is the specific heat of the metal sample? (The specific heat of brass is 0.092 cal/g-C°.) Show your work.
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Water is placed into an iron container. They are thermally isolated.The iron container has a mass of 600. g and is initially at 90.0 degrees Celsius. The water has a mass of 180. g and is initially at 30.0 degrees Celsius.What is the temperature of the container and water once they reach thermal equilibrium?
A lab instructor performs an experiment using an aluminum container, with a mass of 0.150 kg, that contains 0.285 kg of water, all initially at 28.0°C. The lab instructor then adds a sample of an unknown substance to the water. The sample has a mass of 1.3 kg and an initial temperature of 91.0°C. After waiting until the entire system reaches thermal equilibrium, the lab instructor measures a final temperature of 32.0°C. What is the specific heat (in J/(kg · °C)) of the unknown substance? You may assume the thermal energy transferred to the environment during the experiment is negligible.
? J/(kg · °C)
An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Two metallic blocks are placed into the water. One is a 50.0-g piece of copper at 80.0°C. The other has a mass of 70.0 g and is originally at a temperature of 100°C. The entire system stabilizes at a final temperature of 20.0°C. (a) Determine the specific heat of the unknown sample. (b) Using the data as shown, can you make a positive identification of the unknown material? Can you identify a possible material? (c) Explain your answers for part (b).
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Physics Laboratory Manual
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