College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 11, Problem 24P

When a driver brakes an automobile, the friction between the brake drams and the brake shoes converts the car’s kinetic energy to thermal energy. If a 1 500-kg automobile traveling at 30 m/s comes to a halt, how much does the temperature rise in each of the four 8.0-kg iron brake drums? (The specific heat of iron is 448J/kg · °C.)

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When a driver brakes an automobile, the friction between the brake drums and the brake shoes converts the car’s kinetic energy to thermal energy. If a 1500-kg automobile traveling at 30 m/s comes to a halt, how much does the temperature rise in each of the four 8.0-kg iron brake drums? (The specific heat of iron is 448 J/kg . °C.)
A window glass that is 0.5 cm thick has dimensions of 3 m by 1.5 m. The thermal conductivity of this glass is 0.8 W/m ∙ K. If the outside surface of the glass is at -10°C and the inside surface is at 20°C, how much thermal energy is transferred through the window in every hour by heating?
What is the heat current due to conduction through the air layer in a double paned window if the two glass windows are 1 mm apart. The surface area of the windows is 0.5 m², the inner glass is 72 degrees C and the outer glass is -20 degrees C. The thermal conductivity of air is 0.024 W/mK. 1104 J/s 248 J/s 624 J/s 43 J/s

Chapter 11 Solutions

College Physics

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