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Engineering

Lyric Jenkins

When they say in the United States that a car's tire is filled "to 32 lb," they mean that

its internal pressure is 32 lbf/in² above the ambient atmosphere. If the tire is at sea level,

has a volume of 3.0 ft³, and is at 75°F. Estimate the total weight of air, in lbf, inside the tire

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Engineering

Kinsley Butler

A geothermal power plant uses geothermal water extracted at 150°C at a rate of 210 kg/s as the heat source and produces 8000 kW of net power. The geothermal water leaves the plant at 90°C.

If the environment temperature is 25°C, determine

(a) the actual thermal efficiency,

(b) the maximum possible thermal efficiency,

(c) the actual rate of heat rejection from this power plant.

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Engineering

Adan

A liquid drug, with the viscosity and density of water, is to be administered through a hypodermic needle. The inside diameter of the needle is 0.27 mm and its length is 50 mm. Determine (a) the maximum volume flow rate for which the flow will be laminar (Re < 2300), (b) the pressure drop required to deliver the maximum flow rate, and (c) the corresponding wall shear stress

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Engineering

Deacon Wheeler

All circuits need three basic parts: an energy source, wires, and the object that is going to change the electrical energy into another form of energy called

A. load

B. form

C. frame

D. none of the above

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Engineering

Karsyn Jefferson

How did Atlantis benefit from lessons learned in construction of earlier orbiters?

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Engineering

Akira Townsend

Significant figures are an indicator of accuracy. a) True b) False

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Engineering

Jade Goodman

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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Engineering

Moises Huber

The rate at which velocity changes is called?

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Engineering

Danny Horn

Indicate whether the following statements are true or false for a reversible process: (A) Q=0. (B) Work may be calculated using the equation of state. (C) The total entropy change of the system and the surroundings is zero.

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Engineering

Aydan

Lot ABCD between two parallel street lines is 350.00 ft deep and has a 220.00-ft frontage (AB) on one street and a 260.00-ft frontage (CD) on the other. Interior angles at A and B are equal, as are those at C and D. What distances AE and BF should be laid off by a surveyor to divide the lot into two equal areas by means of a line EF parallel to AB?

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Engineering

Sydney Montes

What are some of the symptoms of a faulty speaker?

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Engineering

Kelton Monroe

We discover a nearby star with two planets. The first planet has an orbit period of 10 years and is in a circular orbit with radius 106 km. The second planet has an orbit period of 15 years. What is its orbit radius? You may assume it is also in a circular orbit.

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Engineering

Tobias Arnold

Refrigerant-134a is throttled from the saturated liquid state at 800 kPa to a pressure of 140 kPa. Determine the temperature drop during this process and the final specific volume of the refrigerant.

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Engineering

Javion Juarez

How do you make a robotic dog

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Engineering

Danna Eaton

A three-phase 25-kVA, 480-V, 60-Hz alternator, operating under balanced steady-state conditions, supplies a line current of 20 A per phase at a 0.8 lagging power factor and at rated voltage.

Determine the power triangle for this operating condition.

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