5. Material Time to reach equilibrium A 5 minutes B 30 minutes C 110 minutes In
ID: 1397636 • Letter: 5
Question
5.
Material
Time to reach equilibrium
A
5 minutes
B
30 minutes
C
110 minutes
In an experiment, a thin sheet of material A, B, or C was used to divide two objects of different temperature. In each trial, the conditions were identical except for the material of the thin sheet. The data table shows the times in which the objects reached thermal equilibrium.
Which material, if any, is the best thermal conductor?
material C
material A
All three conduct heat equally well.
material B
6.
What is the SI unit of heat?
joule
kelvin
British Thermal Unit
calorie
7.
348 kJ
2900 kJ
599 kJ
471 kJ
8.
Deodorants use materials that sublime easily. Why does the rate of sublimation of these materials increase after they are applied to the human body?
Sweat from the body decreases the vapor pressure above the materials.
Sweat from the body mixes with the materials, increasing their surface area.
The body absorbs heat from the materials.
The body supplies the heat that is needed for sublimation to occur.
9.
410 K
690 K
378 K
157 K
10.
A sphere has surface area 1.25 m2, emissivity 1.0, and temperature 100.0°C. What is the rate at which it radiates heat into empty space? The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2 ? K4).
3.7 W
9.9 mW
7.1 W
1.4 kW
0.71 mW
11.
Conduction will occur between objects at different temperatures that are _____.
in contact with each other, but not separated
in contact with each other or separated
separated, but not in contact with each other
5.
Material
Time to reach equilibrium
A
5 minutes
B
30 minutes
C
110 minutes
In an experiment, a thin sheet of material A, B, or C was used to divide two objects of different temperature. In each trial, the conditions were identical except for the material of the thin sheet. The data table shows the times in which the objects reached thermal equilibrium.
Which material, if any, is the best thermal conductor?
material C
material A
All three conduct heat equally well.
material B
6.
What is the SI unit of heat?
joule
kelvin
British Thermal Unit
calorie
Explanation / Answer
5) material A
6) joule
7) 471 kJ
8) The body supplies the heat that is needed for sublimation to occur
9) 378 K
10) 1.4 kW
11) in contact with each other, but not separated
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