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.

Explain the following observations, using diagrams to illustrate your answer wherever possible:

(a) Steel nails used to hold copper roofing sheet in position failed rapidly by wet corrosion.

(b) The corrosion of an underground steel pipeline was greatly reduced when the pipeline was connected to a buried bar of magnesium alloy.

(c) Mild-steel radiators in a central heating system were found to have undergone little corrosion after several years' service.
(d) A reaction vessel for a chemical plant was fabricated by welding together stainless steel plates containing 18% chromium, 8% nickel and 0.1% carbon. During service, it was observed that the vessel corroded badly near the welds.

A five metre tall, 1 m diameter Flettner rotor mounted on a small cargo vessel, spins at 50 rpm in a steady beam breeze of 15 knots. What is the thrust generated by the rotor? The air density and viscosity may be assumed constant at 1.22 kg/m3 and 1.79 x 10‐5 Pa.s respectively. Note also that 1 knot = 0.514 m/s.   Which direction must the rotor spin to produce forward thrust?

Describe a typical polymer molecule in terms of its chain structure and repeat units. Use a specific example polymer other than polyethylene to illustrate the ideas

The origins of stiffness

Explain the relationship between the cohesive energy of bonding and the observed stiffness of individual bonds.

How does the stiffness of individual bonds in a solid affect the overall stiffness and elastic modulus of the material?

What is the atomic level mechanism of elastic deformation? In other words, what is occurring within a solid when it is elastically deformed?

(Amorphous vs semi-crystalline)

Using words and visuals, describe the amorphous and semi-crystalline arrangements of polymer chains when forming a solid. Using examples of specific polymers, explain why some types of polymer chains do not readily align and tend to be amorphous while others readily form semi-crystalline structures.