Chapter 18, Problem 058
A solid cylinder of radius r1 = 3.0 cm, length h1 = 4.6 cm, emissivity 0.73, and temperature 21°C is suspended in an environment of temperature 65°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.43 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
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A solid cylinder of radius r1 = 2.2 cm, length h1 = 4.7 cm, emissivity 0.82,...
A solid cylinder of radius r1 = 2.2 cm, length h1 = 4.7 cm, emissivity 0.82, and temperature 25°C is suspended in an environment of temperature 55°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.51 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
A solid cylinder of radius r1 = 2.2 cm, length h1 = 5.9 cm, emissivity 0.91,...
A solid cylinder of radius r1 = 2.2 cm, length h1 = 5.9 cm, emissivity 0.91, and temperature 38°C is suspended in an environment of temperature 70°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.55 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment...
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?
+-/1 points My Notes 6. A sphere of radius 0.500 m, temperature 27.3°C, and emissivity 0.873...
+-/1 points My Notes 6. A sphere of radius 0.500 m, temperature 27.3°C, and emissivity 0.873 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? W (c) What is the sphere's net rate of energy exchange?
4. Mixed-Mode Heat Transfer - A transistor capsule is roughly spherical with a 1 cm diameter,...
4. Mixed-Mode Heat Transfer - A transistor capsule is roughly spherical with a 1 cm diameter, covered by a very thin dielectric coating with radiation emissivity E 0.85 The transistor surface is at 60 °C and the surrounding air is at 30°C. The transistor is contained by the black walls of a spherical case with temperature 35 °C, where the case walls are located at a distance H 10 cm from the transistor capsule wall. a) Find the rate of...
A cold beverage can be kept cold even a warm day if it is slipped into...
A cold beverage can be kept cold even a warm day if it is slipped into a porous ceramic container that has been soaked in water. Assume that energy lost to evaporation matches the net energy gained via the radiation exchange through the top and the side surfaces. The container and beverage have temperature T = 16°C, the environment has temperature Tenv = 32°C, and the container is a cylinder with radius r = 2.42 cm and height 11 cm....
A cold beverage can be kept cold even a warm day if it is slipped into...
A cold beverage can be kept cold even a warm day if it is slipped into a porous ceramic container that has been soaked in water. Assume that energy lost to evaporation matches the net energy gained via the radiation exchange through the top and the side surfaces. The container and beverage have temperature T = 16°C, the environment has temperature Tenv-32°C, and the container is a cylinder with radius r = 2.42 cm and height 11 cm. Approximately the...
The answer is 7.06g If liquid water is open to the environment, evaporation can happen at...
The answer is 7.06g
If liquid water is open to the environment, evaporation can happen at any temperature, with 539 calories being absorbed for every gram of water that evaporates. One way to keep a can of soda cold on a summer day is to fit it with a thin jacket of material that is soaked in water and covers it on all sides. Consider the can to be a cylinder with a radius of 3 cm and a height...
At a certain time of the year, the thermal radiation from the sun (radius of 6.955x10^8...
At a certain time of the year, the thermal radiation from the sun (radius of 6.955x10^8 m) has an intensity of 1.23x10^3 W/m^2 when it reaches the Earth. The surface temperature of the Sun is 5778K and its emissivity is 1.00. i. Calculate the rate energy transfer from the surface of the Sun. Express your answer in W. ii. Use the above information to estimate the distance from the earth to the sun, in meters.
Chenical reaction, Figure 1: Two end of the rods are maintained at different temperatures A chemically...
Chenical reaction, Figure 1: Two end of the rods are maintained at different temperatures A chemically reacting mixture is stored in a thin-walled spherical container of radius 1 200 mm, and the exothermic reaction generates heat at a uniform, but temperature-dependent volumetric rate of q exp( A/T ), where如= 500 W/m3. A = 75 K. and To IS the mixture teinperature in kelvins. The vessel is enclosed by an insulating material of outer radius r2, thermal conductivity k, and emissivity...
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?
+-/1 points My Notes 6. A sphere of radius 0.500 m, temperature 27.3°C, and emissivity 0.873 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? W (c) What is the sphere's net rate of energy exchange?
4. Mixed-Mode Heat Transfer - A transistor capsule is roughly spherical with a 1 cm diameter, covered by a very thin dielectric coating with radiation emissivity E 0.85 The transistor surface is at 60 °C and the surrounding air is at 30°C. The transistor is contained by the black walls of a spherical case with temperature 35 °C, where the case walls are located at a distance H 10 cm from the transistor capsule wall. a) Find the rate of...
A cold beverage can be kept cold even a warm day if it is slipped into a porous ceramic container that has been soaked in water. Assume that energy lost to evaporation matches the net energy gained via the radiation exchange through the top and the side surfaces. The container and beverage have temperature T = 16°C, the environment has temperature Tenv-32°C, and the container is a cylinder with radius r = 2.42 cm and height 11 cm. Approximately the...
The answer is 7.06g
If liquid water is open to the environment, evaporation can happen at any temperature, with 539 calories being absorbed for every gram of water that evaporates. One way to keep a can of soda cold on a summer day is to fit it with a thin jacket of material that is soaked in water and covers it on all sides. Consider the can to be a cylinder with a radius of 3 cm and a height...
Chenical reaction, Figure 1: Two end of the rods are maintained at different temperatures A chemically reacting mixture is stored in a thin-walled spherical container of radius 1 200 mm, and the exothermic reaction generates heat at a uniform, but temperature-dependent volumetric rate of q exp( A/T ), where如= 500 W/m3. A = 75 K. and To IS the mixture teinperature in kelvins. The vessel is enclosed by an insulating material of outer radius r2, thermal conductivity k, and emissivity...
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