Airflow through a long, 0.15-m-square air conditioning duct maintains the outer duct surface temperature at 10°C. If the horizontal duct is uninsulated and exposed to air at 35°C in the crawlspace beneath a home, what is the heat gain per unit length of the duct? Evaluate the properties of air at 300 K. For the sides of the duct, use the more accurate Churchill and Chu correlations for laminar flow on vertical plates.

What is the Rayleigh number for free convection on the outer sides of the duct? 7709251

What is the free convection heat transfer coefficient on the outer sides of the duct, in W/m²·K? 4.87

What is the Rayleigh number for free convection on the top of the duct? 965073

What is the free convection heat transfer coefficient on the top of the duct, in W/m²·K? NEED HELP HERE

What is the free convection heat transfer coefficient on the bottom of the duct, in W/m²·K? NEED HELP HERE

What is the total heat gain to the duct per unit length, in W/m? NEED HELP HERE

I cant figure out 4,5 and 6. I swear they are correct but the online homework won't take it.

Part 1. Select an object from your everyday life that GD&T could be applied to. Attach a graphic image of it (a photograph, a scanned sketch or a computer generated drawing) in JPEG format here.

Part 2. Identify two primary functions of this part (e.g. must assemble to other part(s), smooth rolling, must not wobble when placed on a flat surface). Briefly describe the functions (maximum of 200 words).

Part 3. Assign a minimum of two geometric tolerances (including at least one that requires the use of datums) to the part to ensure that the part will successfully achieve its two primary functions. Assign datums as necessary. Create a sketch or drawing to show where the datums and tolerances will be applied. Assign values for the tolerances, however you will not be marked on the magnitude of the tolerances.

Part 4. Briefly describe (maximum of 150 words) how the part would be inspected to verify that it meets the geometric tolerances.

Write a program usingif-elseif-else statements to calculate the real roots of a quadratic equation ax^2+bx+c=0

The data file contains displacement (in mm)-load (in N) data for a mechanical test that was conducted on an unknown metal. The initial length and diameter of the specimen are also given.

a. (5 pts.) Using the data and a computer program (such as Excel), create an engineering stress-engineering strain graph with proper labels. The stress axis should be in the units of MPa. You do not need to show your spreadsheet or software code used to make the graph. Just provide the resultant graph.

b. (3 pts. each) Using the resultant stress-strain graph determine the following: 1. Young’s modulus 2. 0.2% offset yield strength 3. Ultimate tensile strength 4. Strain at fracture 5. Plastic strain after fracture

DATA:

1) Identify the type of steel (alloy?) with values similar to the following:

Modulus of Elasticity = 189.75 MPa

Ultimate Tensile Strenght (UTS) = 740.05 MPa

Cup Cone Fracture

Toughness = 4.84 MPa

2) Identify the type of treated steel(alloy?) with values similar to the following:

Modulus of Elasticity = 326.07 MPa

Ultimate Tensile Strenght (UTS) = 408.97 MPa

Cup Cone Fracture

Toughness = 140.91 MPa

My guess is that this one is some type of heat treated steel, the steel being the same type as 1) but I do not know how to identify it.

3) Identify the type of brass (alloy?) with values similar to the following:

Modulus of Elasticity = 84.88 MPa

Ultimate Tensile Strenght (UTS) = 480.34 MPa

Diaginal, Rough Fracture

Toughness = 76.47 MPa

All of these values have been calculated from a Tensile Test machine and by hand so there is room for error.

A pipe carries a mixture of, by kmols, 15%C₅H₁₂, 25% C₈H₁₈, 50% C₁₆H₃₄, 10% C₃₂H₄₀. What is the percentage of C₅H₁₂ by mass?

what is vrv system?

Buckling is a problem for sheet metal used on aircraft skins and wings. Traditionally the skin has been riveted to the structure; however, there are manufacturing methods that allow bonding of skin composite panels. Select an aircraft: narrow-body or wide-body and if aluminum or composite skin used, discuss how this will affect the buckling mode and ultimately the service life.

A pipe is carrying liquid at 60 degrees C, that fluctuates in pressure from 0 to 60,000 kPa (non-capped). The inside diameter of the pipe is 20 mm and the wall thickness is 1 mm and is made out of 1095 carbon steel, has a yield strength of 813 MPa and an ultimate tensile strength of 1260 MPa. Using the "Modified-Goodman" failure criteria and a reliability factor of 99%, determine the number of cycles till failure on the inside wall. You can assume that the pipe will have a machined surface finish.?

Consider an airfoil in a high-­?speed wind tunnel. At the minimum-­?pressure point on the wing, the velocity is 900 ft/s. If the test section flow velocity is 750 ft/s at standard sea-­? level conditions:

a) Calculate the pressure coefficient at this point on the wing.

b) Calculate the critical pressure coefficient corresponding to this flight condition.

c) Comparing your answers from parts (a) and (b), what conclusion can you make as to the nature of the flow over the wing? What is the significance of this conclusion with respect to the drag on the airfoil?

A historically devastating environmental event occurred in 2010. System failures in a British Petroleum (BP) oil platform in the Gulf of Mexico led to the release of significant amounts of oil into the Gulf of Mexico. The explosion of the Deepwater Horizon platform seems to be caused by faulty engineering. The spill was one of the worst environmental disasters in North American history. Eleven people were killed and it took almost three months to stop the oil flow.

Discuss how each of the human-centered and nature-centered ethical theories would interpret the moral issues involved in this case, and apply your own environmental ethic to the case.

2) Breifly discuss expected life for the journal bearings from H10 problem 2) compared to equivalent ball bearings from problem 1) above.

Polypropylene (PP)

Polypropylene Homopolymer (PP Homo)

High Impact Polystyrene (HIPS)

High-Density Polyethylene (HDPE)

Linear Low-Density Polyethylene (LLDPE)

Extruded Nylon (Nylon 6/6)

Glass Fiber (30%) Filled Nylon 6 (GF Nylon 6)

Acrylonitrile-Butadiene-Styrene (ABS)

Which of the above material is reinforced material, and which is not?

3a. Identify a real world problem that you are familiar with that can be modeled as a TSP. State the

      problem. Set-up the distance/cost/penalty matrix and solve it using the TSP model provided by

     the Lingo software. You need to define the number of cities and the distance matrix only in the

     model and run it.

     Interpret the optimal solution and comment on the solution. Try to select a problem with 6 to 8

     Tasks(cities).