Recent questions in Engineering

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What is referred to as "Pyroelectric" materials?

Jonathan Smith asked Oct 3, 2020

by Jonathan Smith

6.0k points

1 answer

2 votes

82.7k views

Refrigerant-134a enters an adiabatic compressor as saturated vapor at -24°C and leaves at 0.8 MPa and 60°C. The mass flow rate of the refrigerant is 1.2 kg/s. Determine: (a) The power input to the compressor,

Helmisek asked Oct 3, 2020

by Helmisek

4.8k points

1 answer

5 votes

212k views

Use Euler’s Method: ????????????????=???? ????????????????=−????????−????3+????cos(????) ????(0)=1.0 ????(0)=1.0 ????=0.4 ????=20.0 ℎ=0.01 ????=10000 ▪ Write the data (y1, y2) to a file named "LASTNAME_Prob1.

David Gard asked Oct 3, 2020

by David Gard

5.5k points

1 answer

2 votes

92.0k views

Calculate the change in the enthalpy of argon, in kJ/kg, when it is cooled from 75 to 35°C. If neon had under-gone this same change of temperature, would its enthalpy change have been any different?

Hridya Pv asked Oct 3, 2020

by Hridya Pv

6.2k points

1 answer

4 votes

46.4k views

A rigid, sealed cylinder initially contains 100 lbm of water at 70 °F and atmospheric pressure. Determine: a) the volume of the tank (ft3 ). Later, a pump is used to extract 10 lbm of water from the cylinder.

Ibe asked Oct 3, 2020

by Ibe

6.5k points

1 answer

4 votes

170k views

What's the monomer? Show the structure.

Blessing asked Oct 3, 2020

by Blessing

5.1k points

1 answer

0 votes

74.0k views

A 150-lbm astronaut took his bathroom scale (a spring scale) and a beam scale (compares masses) to the moon where the local gravity is g = 5.48 ft/s^2. Determine how much he will weigh (a) on the spring

Haschibaschi asked Oct 2, 2020

by Haschibaschi

5.8k points

1 answer

2 votes

3.0k views

An electric power generation station, produce 0.8 MW of power. If the coal releases 8*10^6 k/h of energy, determine the rate at which heat is rejected from the power plant. (i) -1422.2 (ii) -802.2 (iii)

Yuliet asked Oct 2, 2020

by Yuliet

5.9k points

1 answer

3 votes

190k views

What is the De Broglie wavelength of an electron under 150 V acceleration?

Cletus asked Oct 2, 2020

by Cletus

6.6k points

2 answers

4 votes

159k views

Oil is graded by the A. Society of Automotive Teachers B. Society of Automotive Engineers C. League of Automotive Gurus D. Bureau of Automotive Technicians

Seidah asked Oct 2, 2020

by Seidah

6.2k points

2 answers

5 votes

151k views

A 1-kW electric resistance heater submerged in 10-kg water is turned on and kept on for 15 min. During the process, 400 kJ of heat is lost from the water. The temperature rise of water is : (a) 21.50 (b)

Horatius asked Oct 2, 2020

by Horatius

5.3k points

1 answer

4 votes

14.8k views

The disk of radius 0.4 m is originally rotating at ωo=4 rad/sec. If it is subjected to a constant angular acceleration of α=5 rad/sec, what is the magnitudes of the normal component of acceleration of

GordonShumway asked Oct 2, 2020

by GordonShumway

5.7k points

1 answer

1 vote

17.8k views

Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet

Timur asked Oct 2, 2020

by Timur

5.7k points

1 answer

3 votes

97.0k views

Calculate the approximate mass of the steel pipe. Length of pipe = 4m. Inside radius =130mm. Outside radius = 150mm

Filiph asked Oct 2, 2020

by Filiph

5.8k points

1 answer

2 votes

51.1k views

The melting point of Pb (lead) is 327°C, is the processing at 20°C hot working or cold working?

Artyom Kiriliyk asked Oct 2, 2020

by Artyom Kiriliyk

6.4k points

1 answer

5 votes

122k views

Which part does NOT rotate when the engine is running and the clutch pedal is depressed? Question 4 options: A) Pressure plate B) Clutch disc C) Flywheel D) Pilot bearing

Nikola Irinchev asked Oct 2, 2020

by Nikola Irinchev

6.4k points

1 answer

0 votes

152k views

What is the angular velocity (in rad/s) of a body rotating at N r.p.m.?

Nicholas Murray asked Oct 1, 2020

by Nicholas Murray

6.3k points

1 answer

3 votes

83.1k views

The black grille on the back of a refrigerator has a surface temperature of 35°With a total surface area of 1m2. Heat transfer to the room air at 20°C takes place with an average convective heat transfer

Daniel Ezra asked Oct 1, 2020

by Daniel Ezra

5.6k points

1 answer

3 votes

86.8k views

A rigid tank that contains 4.0 kg of N2 at 25°C and 550 kPa is connected to another rigid tank that contains 6.0 kg of O2 at 25°C and 150 kPa. The valve connecting the two tanks is opened, and the two

CrouZ asked Oct 1, 2020

by CrouZ

5.9k points

1 answer

2 votes

104k views

Which of the following quenching materials is LEAST severe in its quenching action (slowest cooling)? a. Air b. Brine c. Oil d. Water

Vivek Goel asked Oct 1, 2020

by Vivek Goel

7.0k points

1 answer

4 votes

233k views

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