Engineering » Page 57

Braylon Herrera

Engineering

A piece of corroded metal alloy plate was found in a submerged ocean vessel. It was estimated that the original area of the plate was 800 cm2 and that approximately 7.6 kg had corroded away during the submersion. Assuming a corrosion penetration rate of 4 mm/yr for this alloy in seawater, estimate the time of submersion in years. The density of the alloy is 4.5 g/cm3.

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Nathanial Carrillo

Engineering

Most hazardous waste can be disposed of in a landfill.

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Engineering

The in situ moist unit weight of a soil is 17.3 kN/m3 and the moisture content is 16%. The specific gravity of soil solids is 2.72. This soil is to be excavated and transported to a construction site for use in a compacted fill. If the specification calls for the soil to be compacted to a minimum dry unit weight of 18.1 kN/m3 at the same moisture content of 16%, how many cubic meters of soil from the excavation site are needed to produce 2000 m3 of compacted fill?

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Engineering

A cargo ship model 1000 ft long is to be modeled in a towing tank at a speed that will produce waves that are dynamically similar to those observed around a prototype. The tests are to represent the prototype moving at a speed of 26 knots (30 MPH, miles per hour). If the model length is 5 ft, the model speed (fts) that the tests need to be is most nearly

A. 0.945

B. 1.45

C. 2.12

D. 3.11

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Engineering

Nitrate salts (NO3-), when heated, can produce nitrites (NO2-) plus oxygen (O2). A sample of potassium nitrate is heated, and the O2 gas produced is collected in a 720 mL flask. The pressure of the gas in the flask is 2.9 atm, and the temperature is recorded to be 319 K. The value of R = 0.0821 atm L / (mol K)

How many moles of O2 gas were produced?

After a few hours, the 720 mL flask cools to a temperature of 293K.

Pnew = atm

What is the new pressure due to the O2 gas?

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Aubrey Carrillo

Engineering

In alternating current, how often does the current alternate between negative and positive? 120 times per second 60 times per second 90 times per second 180 times per second

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Quinten Parrish

Engineering

In vehicles equipped with an anti-braking system the drivers foot must remain firmly on the

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Zaniyah Montgomery

Engineering

5. A non-cold-worked brass specimen of average grain size 0.01 mm has a yield strength of 150 MPa. Estimate the yield strength of this alloy after it has been heated to 500°C for 1000 s, if it is known that the value of σ0 is 25 MPa.

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Engineering

An aluminum rod with a gauge length of 1.18 m undergoes thermal expansion from 20 oC to 92 oC. The thermal expansion coefficient and elastic modulus of aluminum are 22.2 * 10-6 K - 1 and 68.9 GPa respectively

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Engineering

Describe a physical meaning of velocity and acceleration.

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Engineering

Consider a large plane wall of thickness L = 0.4 m, thermal conductivity k = 2.3 W/m·K, and surface area A = 30 m2. The left side of the wall is maintained at a constant temperature of T1 = 90°C, while the right side loses heat by convection to the surrounding air at T[infinity] = 25°C with a heat transfer coefficient of h = 24 W/m2·K. Assuming constant thermal conductivity and no heat generation in the wall, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the wall, (b) obtain a relation for the variation of temperature in the wall by solving the differential equation, and (c) evaluate the rate of heat transfer through the wall. Answer: (c) 9045 W

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Engineering

What type of footwear protects your toes from falling objects and being crushed?

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Nathalie Warner

Engineering

List four (or more) issues addressed by Information Assurance that are often not addressed by Information Security.

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Engineering

1. You have a Co-Cr alloy with Young's Modulus: 645 MPa, Poisson ratio 0.28, and yield strength 501 MPa for that alloy when used in a medical device. From these data estimate the following for a 1 x 2 cm cross-section bar of the alloy having length 12 cm: a. The maximum tensile load that can be applied in the longitudinal direction of the bar without inducing plastic deformation. b. The length and cross-sectional area of the bar at its tensile elastic limit.

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Engineering

Create an ItemSold class for Francis Pet Supply. Fields include an invoice number, description, and price. Create get and set methods for each field. Create a subclass named PetSold that descends from ItemSold and includes three Boolean fields that indicate whether the pet has been vaccinated, neutered, and housebroken, and include get and set methods for these fields. Write an application that creates two objects of each class, and demonstrate that all the methods work correctly. Save the files as ItemSold. java, PetSold. java, and DemoItemsAndPets. java.

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