Five kmol of oxygen (O2) gas undergoes a process in a closed system from p1 = 50 bar, T1 = 170 K to p2 = 25 bar, T2 = 308 K. Determine the change in volume, in m3.

A piston–cylinder assembly contains propane, initially at 27°C, 1 bar, and a volume of 0.1 m3. The propane undergoes a process to a final pressure of 4 bar, during which the pressure–volume relationship is pV1.1 = constant. For the propane, evaluate the work and heat transfer, each in kJ. Kinetic and potential energy effects can be ignored.

Refrigerant 22 undergoes a constant-pressure process within a piston–cylinder assembly from saturated vapor at 5.0 bar to a final temperature of 25°C. Kinetic and potential energy effects are negligible.

Evaluate the work and the heat transfer, each in kJ per kg of refrigerant.

list and explain the principles of behavior-based safety and why an employer should use this concept in the workplace

A Brinell hardness tester is used to determine the hardness of 1/2" thick steel plate. The specifications for the steel require that the steel have a tensile strength between 125 ksi and 150 ksi. A 3000 kg load is used for the test.

A. Calculate the minimum and maximum Brinell hardness of the steel.

B. If a hardness test reveals that the Brinell hardness of the steel plate is 260 BHN what is the diameter of the indention in the surface of the plate from the Brinell hardness test?

How many tons of refrigeration is required to cool 50 GPM of liquid from 110 F to 50 F ?

The liquid has a specific heat of 1.40 BTU/lb F and density of 9.2 lb/gal.

Note:

1 Ton refrigeration = 12,000 BTU/hr

What causes a percent error between the calculated value (done by a computer program like ANSYS) and the the theoretical value (done on paper) for bending stress?

An ideal Otto cycle uses air as the working fluid; its state at the beginning of the compression is 120 psia and 60°F, its temperature at the end of the combustion is 1500°F, and its compression ratio is 9. Use constant specific heats at room temperature. Determine the rate of heat addition and rejection for this ideal Otto cycle when it produces 120 hp. The properties of air at room temperature are R = 0.3704 psia·ft³/lbm·R, c_p = 0.240 Btu/lbm·R, c_v = 0.171 Btu/lbm·R, and k = 1.4.

The rate of heat addition is ____________ Btu/h.

The rate of heat rejection is ___________________ Btu/h.

In your opinion, how will the "car of the future" shape the automobile industry?

As a strategist, what would you recommend to industry's leaders in order to sustain in an impending changing environment?

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What does a Southwell plot tell us about column imperfections?

How do you solve this?

A thin-wall pressure vessel is shown below. Internal diameter=d, wall thickness=t.

In addition to the internal pressure p (p=100 psi), a torque T is applied. Assume d=20 inch (r=10 in), t=0.1 inch, T=502,640 in-lb. Determine the wall stress components. Assume that the longitudinal direction is labeled as x and the circumferential (hoop) direction is label as y.

Use Mohr's circle to determine the principle strains and maximum shear strain. Assume that E=10,000 ksi and Poisson's ratio v=0.3 and plane stress case.

Find epsilon x, y, and z. Find gamma xy

he path of motion of a 7-lb particle in the horizontal plane is described in terms of polar coordinates as r = (3 t + 1)ft and θ = (0.5 t2 − t) rad, where t is in seconds.Determine the magnitude of the unbalance force at t = 3.0 seconds.

Thermodynamics: You have a (mostly) insulated carafe in which you store your coffee. Coffee can be modeled as saturated water for this problem. The internal volume of your carafe is 1 L and you seal the lid when it contains 900 g of coffee (mostly liquid, some vapor) at 90 ◦C.

1. What is the mass [g] of water vapor in the carafe?

You are very busy at work and forget to drink your coffee. By the end of the day, it has cooled to 35 ◦C.

2. How much energy [kJ] was lost through the walls of the carafe?

3. What is the pressure [kPa] of your now barely warm coffee?

Material Science question

Rank the following elements with regard to how rapidly they will diffuse into FCC Iron (fastest to slowest). Indicate the diffusion mechanism for each.

1) Mo

2) C

3) Cr

4) W

A circular shaft, 100 mm diameter is subjected to combined bending moment and torque, the bending moment being 3 times the torque. If the direct tension yield point of the material is 300 MN/m2 and the factor of safety on yield is to be 4, calculate the allowable twisting moment by the three following theories of failure:
(a) Maximum principal stress theory
(b) Maximum shear stress theory
(c) Maximum shear strain energy theory.