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Engineering

Special considerations must be given to systems using liquid hydrogen for fuel because of: A. Liquid hydrogen's low density B. Liquid hydrogen's low storage temperature C. The high flammability of hydrogen vapors D. All of the above

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Engineering

The way most recursive functions are written, they seem to be circular at first glance, defining the solution of a problem in terms of the problem itself ("A rose is a rose is a rose"). For example, a recursive function to compute the factorial of n might look like this:

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Jefferson Santana

Engineering

In 1903, Aegidius Elling of Norway designed and built an 11-hp gas turbine that used steam injection between the combustion chamber and the turbine to cool the combustion gases to a safe temperature for the materials available at the time. Currently, there are several gas-turbine power plants that use steam injection. Does steam injection improve the thermal efficiency of a gas-turbine power plant?

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Dakota Hutchinson

Engineering

How much a bitcoin today?

#blockchain #Timebit

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Engineering

7. D7 A cylindrical brass rod having a minimum tensile strength of 450 MPa (65,000 psi), a ductility of at least 13%EL, and a final diameter of 12.7 mm (0.50 in.) is desired. Some brass stock of diameter 19.0 mm (0.75 in.) that has been cold worked 35% is available. Describe the procedure you would follow to obtain this material. Assume that brass experiences cracking at 65%CW.

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Engineering

When an electrical signal travels through a conductive wire, it produces an electromagnetic (EM) field. Likewise, when an EM field encounters a conductive wire, it produces a proportional electrical current.

A. True

B. False

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Engineering

Liquid water enters an adiabatic piping system at 15°C at a rate of 8kg/s. If the water temperature rises by 0.2°C during flow due to friction, the rate of entropy generation in the pipe is?

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Engineering

What does stall mean?

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Engineering

A flow of 100 mgd is to be developed from a 190-mi^2 watershed. At the flow line the area's reservoir is estimated to cover 3900 acres. The annual rainfall is 40 in. the annual runoff is 14 in. and the annual evaporation is 49 in.

1. Find the net gain or loss in storage this represents.

2. Calculate the volume of water evaporated in acre * ft and cubic meters.

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Engineering

The ducts of an air heating system pass through an unheated area. As a result of heat losses, the temperature of the air in the duct drops by 4°C. If the mass flow rate of air is 125 kg/min, determine the rate of heat loss from the air to the cold environment. The constant pressure specific heat of air at room temperature is cp = 1.005 kJ/kg·K.

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Engineering

A steel ring with a 2.5000-in. inside diameter at 20.0 ∘C is to be warmed and slipped over a brass shaft with a 2.5020 in. outside diameter at 20.0 ∘C.

(a) To what temperature should the ring be warmed?

(b) If the ring and the shaft together are cooled by some means such as liquid air, at what temperature will the ring just slip off the shaft?

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Engineering

A satellite would have a mass of 270 kg on the surface of Mars. Determine the weight of the satellite in pounds if it is in orbit 15,000 miles above the surface of the Earth.

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Engineering

Explain why it is important to understand hydrostatic forces on surfaces when designing scuba gear, particularly oxygen tanks, for deep sea divers.

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Gwendolyn Moran

Engineering

2. A trapezoidal channel has a bottom width of 4 m and side slopes of 2:1 (H:V). If the flow rate is 50 m3/s at a depth of 3.6 m, report whether the flow is subcritical or supercritical. Also determine the alternate depth (for the same specific energy). Also determine the critical depth.

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Engineering

A square steel bar has a length of 7.2 ft and a 2.5 in by 2.5 in cross section and is subjected to axial tension. The final length is 7.20532 ft. The final side length is 2.49946 in. What is Poisson's ratio for the material? Express your answer to three significant figures.ν = 0.292Part A - Calculate Poisson's ratio A square steel bar has a length of 5.3 ft and a 2.1 in by 2.1 in cross section and is subjected to axial tension. The final length is 5.30470 ft. The final side length is 2.09929 in. What is Poisson's ratio for the material?

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