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Engineering

What's the difference between quality and quantity

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Engineering

Which atom bond in atomic interaction combines electrons, filling its valence zone a) Van der Vaals bond; b) a covalent bond; c) ionic bond; d) metallic bond.

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Leonardo Nelson

Engineering

Describe the common heat treatment for gears and gear teeth.

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Frances Garrison

Engineering

given the classes above, what output is produced by the following code? meg[] elements = {new Lois (), new Stewie (), new Meg (), new Brian () }; for (int i = 0; i

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Engineering

Why might construction crews want to install pipes before the foundation is poured

A. Pipes form an important component of the structural integrity of a foundation.

B. All utilities, including electrical and HVAC, are installed before the foundation is laid.

C. Plumbing must feed into municipal water and sewer lines buried below the foundation.

D. Plumbing crews are more expensive than concrete masons; therefore it is cheaper if they do their work first.

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Engineering

How does the thermal efficiency of an ideal cycle, in general, compare to that of a Carnot cycle operating between the same temperature limits?

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Engineering

What effect does friction have on a flexible system?

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Engineering

Engine oil (unused) flows at 1.81 x 10^-3 kg/s inside a 1-cm diameter tube that is heated electrically at a rate of 76 W/m. At a particular location where flow and heat transfer are fully developed, the wall temperature is 370K. Determine:

a. The oil mean temperature.

b. The centerline temperature.

c. The axial gradient of the mean temperature.

d. The heat transfer coefficient.

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Engineering

At a certain elevation, the pilot of a balloon has a mass of 120 lb and a weight of 119 lbf. What is the local acceleration of gravity, in ft/s2, at that elevation? If the balloon drifts to another elevation where g = 32.05 ft/s2, what is her weight, in lbf, and mass, in lb?

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Lilliana Barrett

Engineering

The total energy of a system remains unchanged during a cycle. a) - True b) - False

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Engineering

An adiabatic heat exchanger is to cool ethylene glycol (cp = 2.56 kJ/kg ºC) flowing at a rate of 2 kg/s from 80 to 40 ºC by liquid water that enters at 20 ºC and leaves at 55 ºC. Determine:

(a) the rate of heat transfer between the water and the ethylene glycol and

(b) the rate of entropy generation in the heat exchanger

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Engineering

Technician A says some coolant recovery systems are pressurized. Technician B says the coolant recovery system is used to keep air in the system. Who is right?

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Engineering

Water initially a saturated liquid at 150°C is contained within a piston-cylinder assembly. The water undergoes a process to the corresponding saturated vapor state, during which the piston moves freely in the cylinder. There is no heat transfer with the surroundings. If the change of state is brought about by the action of a paddle wheel, determine the net work per unit mass, in KJ/Kg, and the amount of entropy produced per unit mass in KJ/Kg*K.

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Engineering

Bridge A is the longest suspension bridge in a Country. Bridge B is 5555 feet shortershorter than Bridge A. If the length of Bridge A is m feet, express the length of Bridge B as an algebraic expression in m. Write an expression representing the length of Bridge B in terms of m.

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Engineering

A copper alloy cylinder 1.17 m long with a diameter of 32.39 mm is subjected to a tensile stress of 1,302 psi along its length. Assuming this applied stress is purely elastic calculate the diameter, in mm, of the cylinder under this load. For copper, the elastic modulus is 1,206,172 psi and the Poisson's ratio is 0.42.

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