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Chapter 19: Q. 2 (page 543)
How much work is done on the gas in the process shown in Figure EX19.2?
The amount of work done energy is 60J
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Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the body鈥檚 surface temperature is 35掳C, what is the net rate of heat loss on a chilly 5掳C day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.
|| A 10 m14 m house is built on a 12-cm-thick concrete slab.
What is the heat-loss rate through the slab if the ground temperature
is 5C while the interior of the house is 22C?
A container holds 1.0 g of oxygen at a pressure of 8.0 atm.
a. How much heat is required to increase the temperature by 100掳C at constant pressure?
b. How much will the temperature increase if this amount of heat energy is transferred to the gas at constant volume?
A scientist whose scale is broken but who has a working
2.5 kW heating coil and a thermometer decides to improvise
to determine the mass of a block of aluminum she has recently
acquired. She heats the aluminum for 30 s and finds that its
temperature increases from 20 C to 35 C. What is the mass of the
aluminum?
Shows two different processes taking an ideal gas from state i to state f.
a. Is the temperature change 鈭員 during process A larger than, smaller than, or equal to the change during process B? Explain.
b. Is the heat energy added during process A greater than, less than, or equal to the heat added during process B? Explain.
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