A large body of lava from a volcano has stopped flowing and is slowly cooling. The interior of the lava is at 12 00 ° C , its surface is at 45 0 ° C , and the surroundings are at 27 .0 ° C . (a) Calculate the rate at which energy is transferred by radiation from 1 .00 m 2 of surface lava into the surroundings, assuming the emissivity is 1.00. (b) Suppose heat conduction to the surface occurs at the same rate. What is the thickness of the lava between the 45 0 ° C surface and the 12 00 ° C interior, assuming that the lava’s conductivity is the same as that of brick?
A large body of lava from a volcano has stopped flowing and is slowly cooling. The interior of the lava is at 12 00 ° C , its surface is at 45 0 ° C , and the surroundings are at 27 .0 ° C . (a) Calculate the rate at which energy is transferred by radiation from 1 .00 m 2 of surface lava into the surroundings, assuming the emissivity is 1.00. (b) Suppose heat conduction to the surface occurs at the same rate. What is the thickness of the lava between the 45 0 ° C surface and the 12 00 ° C interior, assuming that the lava’s conductivity is the same as that of brick?
A large body of lava from a volcano has stopped flowing and is slowly cooling. The interior of the lava is at
12
00
°
C
, its surface is at
45
0
°
C
, and the surroundings are at
27
.0
°
C
. (a) Calculate the rate at which energy is transferred by radiation from
1
.00
m
2
of surface lava into the surroundings, assuming the emissivity is 1.00. (b) Suppose heat conduction to the surface occurs at the same rate. What is the thickness of the lava between the
45
0
°
C
surface and the
12
00
°
C
interior, assuming that the lava’s conductivity is the same as that of brick?
Study of body parts and their functions. In this combined field of study, anatomy refers to studying the body structure of organisms, whereas physiology refers to their function.
(a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a 1.40-m2 surface area? Assume that the animal’s skin temperature is 32.0 °C , that the air temperature is −5.00 °C , and thatfur has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?
A parcel of air with a volume of 9.3 x 10 km that contains 4.8 x 10 kg of water vapor rises to an
altitude where all the water in the parcel condenses and then freezes. What is the change in temperature
of the parcel of air due to freezing? Assume the density of air at the condensation altitude is
7.2 x 10 g/m. The specific heat of air is 0.17 cal/g Co, the latent heat of vaporization of water is
540 cal/g, and the latent heat of fusion of water is 80 cal/g.) Express the answer in standard seientific
nötation.
AT=
x 10
A person inhales and exhales 2.00 L of 37.0C air, evaporating 4.00 X 10-2 g of water from the lungs and breathing passages with each breath. (a) How much heat transfer occurs due to evaporation in each breath? (b) What is the rate of heat transfer in watts if the person is breathing at a moderate rate of 18.0 breaths per minute? (c) If the inhaled air had a temperature of 20.0C, what is the rate of heat transfer for warming the air? (d) Discuss the total rate of heat transfer as it relates to typical metabolic rates. Will this breathing be a major form of heat transfer for this person?
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
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