The figure below shows four
heat conductors made of the same type of material. Choose the
correct arrangement for the heat conductors (using the letters) to
their thermal conductivity from large to small (i.e. from large
thermal conductivity to small thermal conductivity).
(D) > (A) > (B) > (C)
(C) > (A) > (D) > (B)
(B) > (C) > (D) > (A)
(A) > (D) > (C) > (B)
(A) > (D) > (B) > (C)
(D) > (B) > (C) > (A)
Homework Answers
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The figure below shows four
heat conductors made of the same type of material. Choose the...
The figure 4 below shows three conductors made from the same material and have different cross-sectional...
The figure 4 below shows three conductors made from the same material and have different cross-sectional areas and lengths. Rank the three conductors according to their resistance, greatest first. (b) (c)
The figure below shows a hollow sphere made of a material with a temperature-dependent conductivity. The...
The figure below shows a hollow sphere made of a material with a temperature-dependent conductivity. The conductivity of the material is given by: k=bT where b = 0.01 W/m-K and T is the temperature in K. TH Tc Tout The sphere is used to contain liquid neon; therefore, the inner surface of the sphere at rin = 2 cm is held at Tc = 30 K. The outer surface of the sphere is exposed to ambient temperature; therefore, the temperature...
18. A cylinder of radius r and made of a material of thermal conductivity kiis surrounded...
18. A cylinder of radius r and made of a material of thermal conductivity kiis surrounded by a cylindrical shell of inner radius r and outer radius 2r. This outer shell is made of a material of thermal conductivity k2. The two ends of the combined system are maintained at two different temperatures. Under steady state conditions and no loss of heat across the cylindrical surface, the effective thermal conductivity of the arrangement would be: (a) k,+k2 (6) kk kitk,...
[VI] The figure shows three wires, made of the same material, with their cross-sectional areas and...
[VI] The figure shows three wires, made of the same material, with their cross-sectional areas and lengths. The resistance of each wire is as labeled in the figure. Which of the following statements is correct? L 1.5L L/2 AR A/2 R A/2 O Ri=R2 = R3 OR] >R2>R3 OR1 = R2>R3 OR2>R1 = R3
Please provide a step-by-step solution to this problem. Heat Transfer 1. The material should be f...
Please provide a step-by-step solution to this problem. Heat
Transfer 1. The material should be from the textbook (Fundamentals
of Heat and Mass Transfer) or similar
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw 0.58 kg/s. At the given position along the...
2. (60 points) Material A is generating heat at a rate of 11.25 x 103Wm and...
2. (60 points) Material A is generating heat at a rate of 11.25 x 103Wm and is 40 cm thick and has a thermal conductivity of 10 W/mK Material B is 50 cm thick and has a thermal conductivity of 116.8W/mK. Material C is 30 cm thick and has an unknown thermal conductivity. The structure is cooled by a fluid at 25°C with a heat transfer coefficient of 100 A. (30 points) If the maximum temperature occurs 8.89cm from the...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
Four lenses are shown below. All four lenses are made of the same transparent material, all...
Four lenses are shown below. All four lenses are made of the
same transparent material, all curved surfaces have the same
magnitude of radius of curvature, and all four lenses are shown to
the same scale.
Rank the four lenses in order of their focal
length, from most positive to most negative.
Four lenses are shown below. All four lenses are made of the same transparent material, all curved surfaces have the same magnitude of radius of curvature, and all...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the oute...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw-0.58 kg/s. At the given position along the pipe the bulk temperature of the air, Ta-100°C, and the bulk temperature of the water, Tw- s 10°C. The thermal conductivity of stainless steel, kss 15 W/mK....
Four long, parallel conductors carry equal currents of I = 4.21 A. The figure shown below...
Four long, parallel conductors carry equal currents of I = 4.21 A. The figure shown below is an end view of the conductors. The direction of the current is into the page at points A and B (indicated by the crosses) and out of the page at C and D indicated by the dots). Calculate the magnitude and direction of the magnetic field at point P, located at the center of the square with edge of length 0.200 m. 5.95...
The figure 4 below shows three conductors made from the same material and have different cross-sectional areas and lengths. Rank the three conductors according to their resistance, greatest first. (b) (c)
The figure below shows a hollow sphere made of a material with a temperature-dependent conductivity. The conductivity of the material is given by: k=bT where b = 0.01 W/m-K and T is the temperature in K. TH Tc Tout The sphere is used to contain liquid neon; therefore, the inner surface of the sphere at rin = 2 cm is held at Tc = 30 K. The outer surface of the sphere is exposed to ambient temperature; therefore, the temperature...
18. A cylinder of radius r and made of a material of thermal conductivity kiis surrounded by a cylindrical shell of inner radius r and outer radius 2r. This outer shell is made of a material of thermal conductivity k2. The two ends of the combined system are maintained at two different temperatures. Under steady state conditions and no loss of heat across the cylindrical surface, the effective thermal conductivity of the arrangement would be: (a) k,+k2 (6) kk kitk,...
[VI] The figure shows three wires, made of the same material, with their cross-sectional areas and lengths. The resistance of each wire is as labeled in the figure. Which of the following statements is correct? L 1.5L L/2 AR A/2 R A/2 O Ri=R2 = R3 OR] >R2>R3 OR1 = R2>R3 OR2>R1 = R3
Please provide a step-by-step solution to this problem. Heat
Transfer 1. The material should be from the textbook (Fundamentals
of Heat and Mass Transfer) or similar
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw 0.58 kg/s. At the given position along the...
2. (60 points) Material A is generating heat at a rate of 11.25 x 103Wm and is 40 cm thick and has a thermal conductivity of 10 W/mK Material B is 50 cm thick and has a thermal conductivity of 116.8W/mK. Material C is 30 cm thick and has an unknown thermal conductivity. The structure is cooled by a fluid at 25°C with a heat transfer coefficient of 100 A. (30 points) If the maximum temperature occurs 8.89cm from the...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
Four lenses are shown below. All four lenses are made of the
same transparent material, all curved surfaces have the same
magnitude of radius of curvature, and all four lenses are shown to
the same scale.
Rank the four lenses in order of their focal
length, from most positive to most negative.
Four lenses are shown below. All four lenses are made of the same transparent material, all curved surfaces have the same magnitude of radius of curvature, and all...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw-0.58 kg/s. At the given position along the pipe the bulk temperature of the air, Ta-100°C, and the bulk temperature of the water, Tw- s 10°C. The thermal conductivity of stainless steel, kss 15 W/mK....
Four long, parallel conductors carry equal currents of I = 4.21 A. The figure shown below is an end view of the conductors. The direction of the current is into the page at points A and B (indicated by the crosses) and out of the page at C and D indicated by the dots). Calculate the magnitude and direction of the magnetic field at point P, located at the center of the square with edge of length 0.200 m. 5.95...
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