3. A jet aircraft has a drag polar CD = CD,0 + CL 2 /(?e?) = 0.02 + 0.04 CL 2 and wing area 500 m2 . Its initial weight is 3,000,000 N, which includes the fuel weight 1,000,000 N. The thrust specific fuel consumption is 0.9 (N of fuel) / (N of thrust ·hour). Find the maximum endurance of this aircraft.

This is a numerical methods question using MATLAB.

Which of the following code snippets finds the forward difference estimate of the derivative at each of the x values. Assume x and y have been previously defined, for example as

y=[10,20,25, 27.5, 30];
x = [0.3,0.5, 0.8, 0.9, 1];

(d is the derivative variable name)

Although not necessarily so, there may be more than one correct answer.

A wall is constructed of two layers of 2-cm-thick sheetrock (k = 0.17 W/m·K) separated by 16 cm by wood studs (k = 0.11 W/m·K) whose width is 5 cm. The studs are placed vertically 55 cm apart, and the space between them is filled with stagnant air (16 by 55 cm) as insulation (k = 0.026 W/m·K). Pay attention to the measurements!

The house is maintained at 20°C and the ambient temperature outside is ?9°C. Taking the heat transfer coefficients at the inner and outer surfaces of the house to be 8.3 and 34 W/m²·K, respectively, determine the thermal resistance of the wall in C/W considering arepresentative section (1m x 0.60 m) of the wall to three significant digits. That is from stud end to the other stud end...so a single stud in your section..see plan view below and an example to the right without the sheetrock.

Q] The historical actual sales of an item purchased by a factory is given below. What would have been the forecast had the manager a) used 3 period moving average to make the forecast in the past, and b) used exponential smoothing with alpha=0.2 to make the forecast in the past. Show all calculations. PLEASE PROVIDE TABULATED EXCEL CALCULATIONS.

Sub: Material Science

For a bolted assembly with six bolts, the stiffness of each bolt is kb = 4 Mlbf/in and the stiffness of the members is km = 16 Mlbf/in per bolt. A fluctuating external load applied to the entire joint cycles between 20,000 lbf and 40,000 lbf. Assume the load is equally distributed to all the bolts. It has been determined to use 3/8 in - 16 UNC grade 8 bolts with rolled threads. Assume the bolts are preloaded to 75% of the proof load.
(a) Determine the alternating stress and mean stress carried by a bolt.
(b) Determine the fatigue factor of safety for infinite life, using the Goodman criterion and a load line that assumes the preload is carefully applied and will not vary during operation.

If the valve face and valve seat do not contact each other evenly after reconditioning---. a. regrind the value with the same stone b regrind the seats with stones of different angles c. knurl the valve guide d. none of the above

6-A frame ^UF was moved along its own n-axis a distance of 5 units, then rotated about its o-axis an angle of 60⁰ , followed by a rotation of 60⁰ about the z-axis, then translated about its a-axis for 3 units, and finally rotated 45⁰ about the x-axis. Calculate the total transformation performed.

You decide to design a heating element using a piece of polished copper wire, 10mm in diameter with an emissivity of 0.08. It will maintain a constant surface temperature of 325°C when immersed inwater.

a. How did we know to apply film boiling to this scenario? (Hint–look at the boiling curve.)

b. What is the rate of heat transfer from the wire to the water per unit length ofwire?

Hint: The corrected total heat transfer due to a vapor film impeding radiation is: q(total) = q(film) + 3/4q(radiation)

Calculate the takt given the following information: ? Two shifts at 8 hours each shift ? Two 10-minute breaks per shift ? 25 minute lunchtime per shift ? There are a total of 8 holidays per year ? Normal work schedule is 5 days per week (Monday-Friday) ? Customer contract calls for 450,000 units/year (contractual agreement) You must show ALL your work/calculations in order to get full credit!

Common practice in chemical processing plants is to clad pipe insulation with a durable, thick aluminum foil. The functions of the foil are to confine the batt insulation and to reduce heat transfer by radiation to the surroundings. Because of the presence of chlorine (at chlorine or seaside plants), the aluminum foil surface, which is initially bright, becomes etched with in-service time. Typically, the emissivity might change from 0.12 at installation to 0.36 with extended service. For a 300-mm-diameter foil-covered pipe whose surface temperature is 90 C, will this increase in emissivity due to degradation of the foil finish have a significant effect on heat loss from the pipe? Consider two cases with surroundings and ambient air at 25 C: (a) quiescent air and (b) a cross-wind velocity of 10 m/s.

identify the stages in the appropriate order in the precipitation hardening of an aluminum alloy

Question 1c (0.5 pts): In a study published in 2016, a team of researchers found that tensile strain caused the valence band of an organic semiconductor to narrow and fall to lower energy levels without affecting the conduction band. What do you think this means for the electrical conductivity of the material when placed under tensile strain? Why do you think this occurs?

For a catapult project I must make a MATLAB code that should make use of the projectile motion equations so for a given input range R (horizontal distance from the catapult to the target), the code outputs the necessary velocity and firing angle of the catapult. I must be able to input ranges: 7ft, 8ft and 9ft and the output of the code should give me the possible velocities and theta of the catapult.

5. Explain how density is affected by crystal shape, i.e., BCC or FCC.

6. Why would you temper material such as steel? If not tempered, how does that influence its likely failure, what will happen?

7. What does a TTT diagram presentation, explain how it is used to determine the material property after cooling.

8. What are the advantages and disadvantages of case hardening and Nitriding?