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Engineering

Barr

Ai r is compressed by a 30-kW compressor from P1 to P2. The air t emperature i s maintained constant at 25oC during thi s process as a result of heat t ransfer to the surroundings medium at 17oC. Determine the rate of entropy change of the air. State the assumptions made in solving this problem.

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Engineering

Guest

What is a Mollier diagram?

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Engineering

Trystan Jimenez

Write a program that adds the numbers 1 through 5 into the numbers ArrayList and then prints out the first element in the list.

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Engineering

Carlen

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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Engineering

Madilynn Hunter

The crash rate per mile is.

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Engineering

Caitlyn Bonilla

In Illinois, once a person has obtained their boating education certificate what is the minimum age to operate a motorized vessel without adult supervision?

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Engineering

Jonathon Dixon

Describe the importance of ferrite and austenite stabilizing elements in steels

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Engineering

Jace Blackburn

Compute the electrical resistivity of a cylindrical silicon specimen 7.0 mm (0.28 in.) diameter and 57 mm (2.25 in.) in length in which a current of 0.25 A passes in an axial direction. A voltage of 24 V is measured across two probes that are separated by 45 mm (1.75 in.).

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Engineering

Harper Wang

Catch of the day:

what fruit does monkeys eat that most humans eat

a. apple

b. banana

c. orange

d. grapes

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Engineering

Devon Cherry

Coils of various dimensions designed to introduce specified amounts of inductance into a circuit are called (a) semiconductors (b) superconductors (c) electromagnets (d) inductons

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Engineering

Koen Rush

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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Engineering

Jordyn Mcintosh

Zona intermedia de pozos

Y

Efecto de inavasion

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Engineering

Belinda Cherry

500 flights land each day at San Jose's airport. Assume that each flight has a 5% chance of being late, independently of whether any other flights are late. Using Excel, calculate the probability of the following events. Turn in your spreadsheet. (a) 15 or fewer flights are late. (b) 30 or more flights are late. (c) Exactly 26 flights are late. (d) Between 10 and 20 flights are late. (e) Does our assumption of independence seem reasonable to you? Why or why not?

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Engineering

Deangelo Mckinney

An automobile travels along a straight road at 15.65 m/s through a 11.18 m/s speed zone. A police car observed the automobile. At the instant that the two vehicles are abreast of each other, the police car starts to pursue the automobile at a constant acceleration of 1.96 m/s2. The motorist noticed the police car in his rear view mirror 12 s after the police car started the pursuit and applied his brakes and decelerates at 3.05 m/s2. (Hint: The police will not go against the law.) a) Find the total time required for the police car to overtake the automobile. (12 marks) b) Find the total distance travelled by the police car while overtaking the automobile. (2 marks) c) Find the speed of the police car at the time it overtakes the automobile

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Engineering

Mylee Avila

A 2-kg plastic tank that has a volume of 0.2 m3 is filled with liquid water. Assuming the density of water is 1000 kg/m3, determine the weight of the combined system. The weight of the combined system is N.

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