Engineering » Page 48

Engineering

find magnitude of the resultant force, if 30N, 40N, 50N and 60N forces are acting along the line joining the centr of a square to its vertices

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Zechariah Preston

Engineering

Engineers are designing a ceramic component for a jet engine. The ceramic has a fracture toughness of 8 MPa m^1/2. The ceramic is subjected to a maximum tensile stress of 500 MPa. Calculate the maximum size of surface flaws that the part can have.

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Engineering

Explain why it is important for a power supply to match the electrical specifications of an electrical device?

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Engineering

The 10 and 2 o'clock hand position on the steering wheel is no longer recommend because

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Engineering

The heat rate is essentially the reciprocal of the thermal efficiency. a) - True b) - False

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Engineering

Which of the following is "invalid" assignment? name (x) < - c ("New York", "Seattle", "Los Angeles") names (x) < - c ("New York", "Seattle", "Los Angeles") x < - list ("Los Angeles" = 1, Boston = 2, London = 3)

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Engineering

is Compression ratio decreased when a large volume of combustion chamber deposits accumulate in the engine?

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Engineering

Define cooling tower "range" as it applies to cooling towers.

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Engineering

Steel balls 10 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 450 K in an air environment for which T[infinity] = 325 K and h = 25 W/m2 ·K. Assuming the properties of the steel to be k = 40 W/m·K, rho = 7800 kg/m3, and c = 600 J/kg·K, estimate the time required for the cooling process.

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Frederick Stein

Engineering

This report contains three fields: the label of the vending machine, what percentages of the beverages it was last stocked with are sold, and how many total dollars of sales has this generated. You will need to create a new dictionary where the keys are the vending machine labels, and the values are a new type of object called a 'MachineStatus'. For each instance, the 'MachineStatus' class should store:

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Engineering

A poorly educated engineer designs a chlorine disinfection tank as a CSTR rather than as a PFR. It has a detention time of 30 min.

(a) Calculate the reduction in bacteria [1 - (COUT/CIN) ]*100% that would be achieved using an ideal PFR with a 30 minute detention time operating at the design chlorine dose. The first-order rate constant K = 0.23/min.

(b) What reduction in bacteria does the CSTR achieve?

(c) The first-order rate of kill depends also on the chlorine concentration, k = K (Cl2), where k = new rate constant, K = constant at the design chlorine dose, and (Cl2) = multiple of the design chlorine concentrations.

How much would the chlorine have to be increased (by what multiple) to increase the rate so that the CSTR would reduce the bacteria from 100,000 cells/ml to 100 cells/ml? Assume K is linearly related to chlorine concentration.

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Cristopher Bruce

Engineering

What human behaviors (actions) contributed to past pandemics

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Engineering

Sometimes, steel studs may not be used on outside walls because they are?

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Engineering

1. On a 2001 Honda Civic, while replacing fuel injectors, what do you coat the new O-rings with?

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Engineering

The strength and stiffness of a properly constructed composite buildup depends primarily on?

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