1)please type do not write

. How do you test if a property is intensive or extensive? Using density and volume of a system as examples, explain whether these are extensive.

please type do not write

You are looking to start a business after you inherited a rolling setup, like the one from problem 2. You did a test run and measured P = 250kW, you will use this next. Also, you call you local power provider in Colorado and fin that the energy cost is 11.2 cents/kWh.

From a metal producer, you can buy 3/8” thick by 12” wide 6061 aluminum in 36 ft lengths. These are delivered to your warehouse at a cost of $1169 each.

You decide to buy the 38” sheet and roll it into 1/4” a sheet. You hire a shop worker to do this and he charges $35/hr. You also need to add $20/hr overhead.

You want to sell 4 feet long sheet and you shop worker needs 2mins to cut the rolled sheet into the 4 feet lengths and place then on a pallet for shipment.

Question: McMaster-Carr sells 1/4” x 12” x 48” sheets for $93.79, will you be able to sell yours for less? What is your cost per 1/4” plate? Show your work.

In an experiment the sample mean of a set of measurement is 10 mm and the sample standard deviation is 4 mm for a sample size of 36. Using sketch indicate where we can expect the location of population mean

3

a. Using energy storage in mechanical and electrical elements as a guide, if inductance L and mass m are analogous, what is the mass velocity ??? analogous to in the electrical circuit?

c. State the equations for the capacitance equivalent for “n” capacitors in series and for “n” capacitors in parallel.

d. What are the energy storage and power dissipative elements and their equations in an electrical circuit?

1. Engine oil (cp = 2100 J/kg-°C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cmdiameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfg = 2174 kJ/kg).

a. For an overall heat transfer coefficient of 650 W/m2 -°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0 m)

b. What would the tube length have to be if we wanted to heat the oil to 100 °C in the same 2-cm diameter tube and at the same flow rate? How about heating to 120 °C?

list the material selection criteria for a newly developed part?

In a controlled experiment, it takes 3700 J to melt the amount of metal that is in a weld bead with a cross-sectional area of 6.0 mm2 that is 150.0 mm long. (a) Using Table 28.2, what is the most likely metal? (b) If the heat transfer factor is 0.85 and the melting factor is 0.55 for a welding process, how much heat must be generated at the welding source to accomplish the weld?

Q2. Two kilograms of air within a piston-cylinder configuration execute a Carnot power cycle between temperatures 750 K and 300 K. The isothermal expansion is associated with a release of 60 kJ of heat into the surroundings. The volume after expansion has occurred isothermally is 0.4 m3 . Assuming air behaves as an ideal gas, calculate: (i) thermal efficiency for the cycle (ii) pressure and volume at the beginning of the isothermal expansion, in kPa and m3 , respectively. (iii) the work and heat transfer for each of the four processes, in kJ.

write a conclusion and recommendations about Vibrational and Acoustical analysis of a vacuum brush? how to improve it ?

Engine oil (raffinate) with a flow rate of 5 kg/s will be cooled from 60°C to 40°C by sea water at 20°C in a double-pipe heat exchanger. The water flows through the inner tube, whose outlet is heated to 30°C. The inner tube outside and inside diameters are do = 1.315 in. (= 0.0334 m) and di = 1.049 in. (= 0.02664 m), respectively. For the annulus, Do = 4.5 in. (= 0.1143 m) and Di = 4.206 in. (= 0.10226 m). The length of the hairpin is fixed at 3 m. The wall temperature is 35°C. The number of the tubes in the annulus is 3. The thermal conductivity of the tube wall is 43 W/m ? K. Calculate: a. The heat transfer coefficient in the annulus b. The overall heat transfer coefficient c. The pressure drop in the annulus and inner tube (only straight sections will be considered) d. What is your decision as an engineer? How can you improve the design?

Describe the difference between spectral and total blackbody emissive power.

The clausius statement of the second law denies the possiblity of transferring energy by heat from a cooler to a hotter body. I think it true because the statement says that " no process is possible in which the sole result of it would be the transfer of heat from a cooler to a hotter body" However, the textboox solution says otherwise. can somebody explain

Thermodynamics

Air at 40 degrees C is humidified by flowing over a 1-m-long container filled with water. The surface area of container is 0.5m^2.The interfacial temperature is 20 degrees C. If the initial humidity of the air is 0% and its velocity is 0.5 m/s, calculate the mass flow rate of vapor evaporated.

Compute the maximum thrust density, power density and specific impulse for a 3-grided ion engine, having an acceleration voltage of 2000 V, and a voltage difference of 2500 V and a gap of 1.5 mm between the plasma and the first acceleration screens. Compute the propulsive parameters for the following propellants: xenon, argon, and molecular hydrogen.