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Chapter 19: Q. 11 (page 543)
500 J of work are done on a system in a process that decreases the system’s thermal energy by 200 J. How much heat energy is transferred to or from the system?
The value of heat is -700J
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A gas is compressed from 600 cm3 to 200 cm3 at a constant pressure of 400 kPa. At the same time, 100 J of heat energy is transferred out of the gas. What is the change in thermal energy of the gas during this process?
The sun's intensity at the distance of the earth is . of this energy is reflected by water and clouds; is absorbed. What would be the earth's average temperature (in ) if the earth had no atmosphere? The emissivity of the surface is very close to 1 . (The actual average temperature of the earth, about , is higher than your calculation because of the greenhouse effect.)
a. 100 J of heat energy are transferred to 20 g of mercury. By how much does the temperature increase?
b. How much heat is needed to raise the temperature of 20 g of water by the same amount?
A 5.0 g ice cube at -20°C is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam at 200°C? Steam has CV = 1500 J/kgK and CP = 1960 J/kgK
10 g of aluminum at 200°C and 20 g of copper are dropped into 50 cm3 of ethyl alcohol at 15°C. The temperature quickly comes to 25°C. What was the initial temperature of the copper?
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