The ends of a 20-cm-long, 2.0-cm-diameter rod are maintained at and by immersion in an ice-water bath and boiling water. Heat is conducted through the rod at 4.5 * 104 J per hour. Of what material is the rod made?
The material of which the rod is made is iron.
It can be found that the thermal conductivity of iron is
Therefore, the material is iron.
The burner on an electric stove has a power output of 2.0 kW. A 750 g stainless steel teakettle is filled with 20°C water and placed on the already hot burner. If it takes 3.0 min for the water to reach a boil, what volume of water, in cm3, was in the kettle? Stainless steel is mostly iron, so you can assume its specific heat is that of iron.
52. An ideal-gas process is described by , where is a CALC constant.
a. Find an expression for the work done on the gas in this process as the volume changes from to .
b. of gas at an initial temperature of is compressed, using this process, from to . How much work is done on the gas?
c. What is the final temperature of the gas in ?
The gas cylinder in Figure Q19.10 is well insulated except for the bottom surface, which is in contact with a block of ice.
The piston can slide without friction. The initial gas temperature is
a. During the process that occurs until
the gas reaches a new equilibrium, are
(i) , (ii) W, and (iii) Q greater than, less than, or equal to zero? Explain.
b. Draw a pV diagram showing the process.
A 50.0 g thermometer is used to measure the temperature of
200 mL of water. The specific heat of the thermometer, which
is mostly glass, is 750 J/kg K, and it reads 20.0C while lying
on the table. After being completely immersed in the water, the
thermometer’s reading stabilizes at 71.2C. What was the actual
water temperature before it was measured?
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