The length of an aluminum pipe at 40°C is 24.5 cm. What is its length at...
The length of an aluminum pipe at 40°C is 24.5 cm. What is its length at 71°C? State your answer to nearest 0.001 cm, follow the standard rounding rules in stating answer, and do not attempt to write the units. Take the thermal expansion coefficient of aluminum to be 24x10-6 /K, and take the absolute zero to be -273 °C.
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The length of an aluminum pipe at 40°C is 24.5 cm. What is its
length at...
Determine the density of oxygen at 156,000 Pa pressure and Temperature = -8 °C. State your...
Determine the density of oxygen at 156,000 Pa pressure and Temperature = -8 °C. State your answer to nearest 0.001 kg/m3, follow the standard rounding rules in stating answer, and do not attempt to write the units. Take the molar mass of molecular oxygen to be 32 g/mol, R=8.31 JK-1mol-1 and take the absolute zero to be -273 °C.
1. Thermal Expansion Af 20°C, an aluminum cube has an edge length of 20 cm. What...
1. Thermal Expansion Af 20°C, an aluminum cube has an edge length of 20 cm. What is the increase in the surface area of the cube when it is heated from 20°C to 100°C? Your answer should be in units of cm
You want to insert an aluminum rod, which at 20°C has a radius of 1.00020 cm...
You want to insert an aluminum rod, which at 20°C has a radius of 1.00020 cm into a copper tube which has a radius of 1.00010 cm at the same temperature. You decide to put both of them in the refrigerator. At what temperature will the rod just fit if both are cooled to the same temperature? The coefficient of thermal expansion for aluminum is 2.4 × 10-5 K-1, and that of copper is 1.7 × 10-5 K-1.
10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4...
10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4 m., are placed end to end as shown in the figure. The thermal conductivities of the bars are 450 W/mK) and 905 l/s.m.K), respectively. The left end of bar Ais maintained at 373 Kwhile the right end of Bis maintained at 273 K. What is the temperature at the interface between A and B? Please round your answer to the nearest whole number B...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
A pin fin is made of an Aluminum (k=235W/m K) rod length 68 cm and diameter...
A pin fin is made of an Aluminum (k=235W/m K) rod length 68 cm and diameter 10 mm. If the heat transfer coefficient is 10 W/m2 K, calculate the fin efficiency. a. 27% b. 46% c. 35% d. 56% e. 97% f. None of them A 2-m-high, 3-m-wide, and 120-cm-thick wall of a house has a thermal resistance of 0.0124 ºC/W. The thermal conductivity of the wall is a. 0.72 W/mºC b. 1.1 W/mºC c. 1.6 W/mºC d. 16 W/mºC...
LT An aluminum rod of diameter D 2.5 cm and of length from a wall maintained at T, 300"C. The.coovective heat coefficient h 17 W/m2-K with an ambie.t air temperature T Thermal conductivity k =...
LT An aluminum rod of diameter D 2.5 cm and of length from a wall maintained at T, 300"C. The.coovective heat coefficient h 17 W/m2-K with an ambie.t air temperature T Thermal conductivity k = 204 WmK. Assume there is e luid by convection from the end of the rod, which is at temperature Ta. Using 2. -38c. nergy transfer to the a finite difference method, with Ax = 5 cm, the fo be derived for the solution of the...
Question 15 2 pts By what length will a slab of concrete that is originally 18...
Question 15 2 pts By what length will a slab of concrete that is originally 18 m long contract when the temperature drops from 24°C to -16°C? The coefficient of linear thermal expansion for this concrete is 1.0 x 10-5 K-1 0.72 cm O 1.5 cm 0.50 cm 1.2 cm Question 23 4 pts The figure shows a pV diagram for 8.3 g of ideal nitrogen gas N2 in a sealed container. The temperature of state 1 is 59°C, the...
1. Is the floe within the pipe turbulent or laminar? Justify your answer 2. What is the average N...
1. Is the floe within the pipe turbulent or laminar? Justify
your answer
2. What is the average Nusselt number and heat transfer
coefficient in the pipe? You can assume that the flow is fully
developed
3. What length of pipe is required to achieve the desired exit
temperature?
4. Was your assumption of fully developed flow justified?
Explain why or why not. How much error did this assumption
introduce into calculation of nusselt number? Do you need more or...
1. The temperature changes from 3S°F during the night to 75°F during the day. What is...
1. The temperature changes from 3S°F during the night to 75°F during the day. What is the temperature change on the Celsius scale? A)720 B)40°C Answer: D C) 32°C D) 22°C The coefficient of linear expansion of steel is 12 X 10-6 K', what is the change in length of a 25-m steel bridge span when it undergoes a temperature of 40 K? A) 1.2 cm Answer: A 2. B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0...
1. Thermal Expansion Af 20°C, an aluminum cube has an edge length of 20 cm. What is the increase in the surface area of the cube when it is heated from 20°C to 100°C? Your answer should be in units of cm
10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4 m., are placed end to end as shown in the figure. The thermal conductivities of the bars are 450 W/mK) and 905 l/s.m.K), respectively. The left end of bar Ais maintained at 373 Kwhile the right end of Bis maintained at 273 K. What is the temperature at the interface between A and B? Please round your answer to the nearest whole number B...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
LT An aluminum rod of diameter D 2.5 cm and of length from a wall maintained at T, 300"C. The.coovective heat coefficient h 17 W/m2-K with an ambie.t air temperature T Thermal conductivity k = 204 WmK. Assume there is e luid by convection from the end of the rod, which is at temperature Ta. Using 2. -38c. nergy transfer to the a finite difference method, with Ax = 5 cm, the fo be derived for the solution of the...
Question 15 2 pts By what length will a slab of concrete that is originally 18 m long contract when the temperature drops from 24°C to -16°C? The coefficient of linear thermal expansion for this concrete is 1.0 x 10-5 K-1 0.72 cm O 1.5 cm 0.50 cm 1.2 cm Question 23 4 pts The figure shows a pV diagram for 8.3 g of ideal nitrogen gas N2 in a sealed container. The temperature of state 1 is 59°C, the...
1. Is the floe within the pipe turbulent or laminar? Justify
your answer
2. What is the average Nusselt number and heat transfer
coefficient in the pipe? You can assume that the flow is fully
developed
3. What length of pipe is required to achieve the desired exit
temperature?
4. Was your assumption of fully developed flow justified?
Explain why or why not. How much error did this assumption
introduce into calculation of nusselt number? Do you need more or...
1. The temperature changes from 3S°F during the night to 75°F during the day. What is the temperature change on the Celsius scale? A)720 B)40°C Answer: D C) 32°C D) 22°C The coefficient of linear expansion of steel is 12 X 10-6 K', what is the change in length of a 25-m steel bridge span when it undergoes a temperature of 40 K? A) 1.2 cm Answer: A 2. B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0...
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