Do some internet research on the properties of composite materials. a) Compare the tensile strength of a typical glass fibre reinforced polymer with the tensile strength of a carbon fibre reinforced polymer. Make sure you the fibre lay-up is the same in your two examples and that you record what that is in your answer. Use data tables from reputable engineering or scientific web pages or material suppliers only and cite your reference(s).

Answer:....................................................................................................................... ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. b) Write a few lines about metal-matrix composites and how their properties compare with polymer based composites.

Answer:....................................................................................................................... ................................................................................................................................. ................................................................................................................................. .................................................................................................................................

Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with a velocity of 3.5 m/s. If the surface temperature of the sphere is constant at 80°C, determine the Reynolds number corresponding to the sphere, its average drag co-efficient, and the heat transfer rate from the sphere. The properties of air (1 atm) at the free stream temperature T_∞ = 20°C, ρ = 1.204 kg/m³, k = 0.02514 W/m∙K, μ = 1.825 × 10⁻⁵ kg/m∙s, and Pr = 0.7309. At the surface temperature T_s= 80°C: μ_s = 2.096 × 10⁻⁵ kg/m∙s. At the film temperature T_f = (80°C + 20°C)/2 = 50°C: ρ = 1.092 kg/m³ and v = 1.798 × 10⁻⁵ m²/s. (Round the Reynolds number to the nearest whole number and other answers to two decimal places.)

Look up today’s wholesale prices of natural gas in Texas (4.74 Dollars per thousand cubic feet) Calculate how much a kWh of electricity should cost, if it is being produced from (a) natural gas and (b) wind. You will need to worry about efficiency of combustion, energy content of natural gas, conversion of joules in kWh, etc. You will also need to figure out how to price wind, which of course blows for free.

For each of the product applications below answer the material design, requirement and selection questions using the following format.

a) List the desired material properties (not limited to mechanical properties) for the intended application

b) What are the typical materials that are used for the intended application? If you are unable to find an exact answer, predict the material category (such as metals/alloys, ceramics, polymers, composites etc.) that you would select.

c) What mechanical property would you test and using what choice of test (s) – both for checking the suitability of your chosen material and for product safety.

1) Turbine blades for a jet engine

2) Axle for Baja vehicle

3) Non-stick coating for a cooking pan

4) Protective cover/coating for a smart phone

5) Gears for wind turbine

6) Bearings

7) Bleachers

8) Body armor hard plates

9) Hockey puck

10) Underground fiber optic cables

11) Protective sheath for underground cables

Comparisons of quality aspects of metal casting processes . 

What happens to a gas when it expands, specifically how do its properties change, include at least temperature, pressure, volume, enthalpy, entropy?

What are the materials that improved water accessibility? How did it improve water accessibility?

(Can you please not answer handwriting type it)

Exercise

Estimate the requirements of steam and heat transfer surface, and the evaporating temperatures in each effect, for a triple effect evaporator evaporating 500 kg h^-1 of a 10% solution up to a 30% solution. Steam is available at 200 kPa gauge and the pressure in the evaporation space in the final effect is 60 kPa absolute. Assume that the overall heat transfer coefficients are 2270, 2000 and 1420 J m^-2 s^-1 °C^-1 in the first, second and third effects respectively. Neglect sensible heat effects and assume no boiling-point elevation, and assume equal heat transfer in each effect.

Answer. A₁ = 2.4 m² = A₂ = A₃

Steam consumption: 0.35kg steam/kg water evaporated.

Note: Trial and error solution is not required here.

A strain hardened 360 brass sample that has been cold worked and than placed into a furnace at 480 degrees C for 40 minutes. cooled than poslished and etched.
What is the mechanism that allows for a change in microstructure and mechanical properties due to annealing and recrystallization?

1. Determine Atomic Packing Factor for HCP when atomic radius is r (show all works for full credits)

2. Determine Atomic Packing Factor for Rhombohedral when atomic radius is r and gamma (angle) is 120 degree (see slide 31, ch 4)

3. Determine Max Linear Densities for BCC and FCC (there are multiple)

4. Determine Max Planar Densities for BCC and FCC (there are multiple)

5. Determine Max Linear Densities on the max Planar Density planes from Q4, then compare them to Max Linear Densities from Q3. Explain.

Define fatigue. Mention some of the important parameters by which fluctuating stress cycles are characterized.?

Part A: Define actual and theoretical mechanical advantage, using words as well as equations.

Part B: What law of physics forbids the efficiency of an actual machine from being equal to 1? (100% efficiency)

Part C: What is the efficiency of a wooden ramp (μ =0.2) at an angle of 39 degrees?

Part D: Is a screw an example of a wheel and axle, lever, or inclined plane?

Choose an occupational health hazard interest to you.

*********************** Do not copy write or just post something from google, you will get a thumbs down!!! please and thank you

***** do not hand write please

As a chemical engineer professional, if you were to encounter this hazard in a work environment or situation (thoroughly identify the hazard and describe the situation) describe how you would control the hazard for the workers working in the environment or situation you presented.

1. The following are economic criteria to evaluate an engineering project, except one. Which one?

Select One:

a) Maximum Profit

b) Minimum Profit

c) Maximum Rate of return

d) Minimum Pollution

e) Minimum Payback period

2. Engineers often use a common method used to resolve uncertainty, which is:

Select one:

a. risk analysis.

b. cash-flow analysis.

c. sensitivity analysis.

d. economic impact analysis.

e. marginal analysis.

3. If offered $100 today or $150 one year from now, you are being asked to:

Select one:

a. make a guess.

b. make a choice under uncertainty.

c. reveal your implied interest rate.

d. compare two values which are not comparable in principle.

e. reveal your private financial information.

An air compressor operating in adiabatic steady flow takes in air at 17 C, 200 kPa and discharges is at 1300 kPa. Calculate the minimum work required to drive the compressor assuming the compressor has

i) constant specific heats.

ii) non-constant specific heats.