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?
In: Mechanical Engineering
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.
In: Mechanical Engineering
2) Breifly discuss expected life for the journal bearings from H10 problem 2) compared to equivalent ball bearings from problem 1) above.
In: Mechanical Engineering
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?
In: Mechanical Engineering
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).
In: Mechanical Engineering
In aircraft accident investigation, an Air Detective Tip alluded to the investigative risk of “hindsight bias”. What does this mean and how could it have an effect on discovery of causations?
In: Mechanical Engineering
What on-scene observations may yield clues that separate the difference between an aircraft in-inflight fire from a ground fire? Why then is this difference important to note?
In: Mechanical Engineering
1. What is a fluid? How does it differ from a solid? How does a gas differ from a liquid?
2. What is the no-slip condition? What causes it?
3. What is a boundary layer? What causes a boundary layer to develop?
4. What is a Newtonian fluid? Give an example.
5. Consider two identical small glass balls dropped into two identical containers, one filled with water and the other with oil. Which ball will reach the bottom of the container first? Why?
In: Mechanical Engineering
Select the best answer for the question. 8. A/An _______ fuel-injection system uses individual pumps that are contained within a single injection pump housing. A. individual pump B. multiple-plunger, inline pump C. common rail D. distributor pump
In: Mechanical Engineering
For laminar flow in a circular pipe of diameter
, at what distance from the centerline is the actual velocity equal to the average velocity? Answer as a decimal version of the fraction of . For instance, for enter 0.25.
In: Mechanical Engineering
1)What does the conservation of energy state?
2)What are Sir Newton’s three laws of motion?
3)What are the differences between a liquid and a gas?
4)What are the different types of flow? Describe each type of flow?
5)What is Pascal’s Law?
6)What principle does a pump operate on?
7)What are the two board categories of pumps? Describe each.
8)Name three types of directional control valves and describe each.
9)What is pump cavitation? What rules should be followed to prevent/eliminate cavitation?
10)Differentiate between energy and power.
In: Mechanical Engineering
Design a four stroke cycle for SI engine using crankcase compression. Draw schematics of the six basic process: intake, compression, combustion, expansion, blowdown and exhaust. Describe fully the intake of air, fuel and oil.
In: Mechanical Engineering
I have a question for the effect and difference on a DC motor for the speed( rad/s) in time (sec) if you apply:
1. Nothing (so no charge in the circuit only the mecanic charge of the generator)
2. A resistant charge (only the resistant is plug in with the generator)
3. Short circuit (No exterior electric charge but the terminals are bounds together so an excessive amount of current flow into the circuit)
4. Capacitive charge (only the capacitor is plug in with the generator)
I would like to know a simple explaination of every result to know why it does that compared to the others please.
In: Mechanical Engineering
How much relative pressure can be achieved with a flat elbow design with baffles compared to a stacked elbow without baffles?
In: Mechanical Engineering
Write an abstract about hardness test of metal, also Rockwell Hardness test and Vickers Hardness Test?
* please do not write it with hand.
In: Mechanical Engineering