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An initially cold T1(t = 0), pure aluminum spherical particle is rolling over a hot surface of temperature Ts at a constant speed ub and is heated through a contact conduction resistance Rk,c. This is shown in Figure Pr. 3.70.
(a) Draw the thermal circuit diagram.
(b) Is the assumption of a uniform temperature valid? Use Rk,1 = 1/(4πD1k1) for the internal conduction resistance.
(c) Determine the length L the ball has to travel before its temperature reaches Tf . Assume that the contact conduction is the only surface heat transfer (surfaceconvection and radiation heat transfer are assumed negligible).
A 55 KG bungee jumper leaps from a bridge. She is tied to a bungee cord that is 12 m long when unstretched, and falls a total of 31 m. Calculate the spring constant of the bungee cord assuming Hooke's law applies.
The developer hires you to conduct a soils investigation as part of the due diligence process. Describe how you would conduct this investigation.
A 45 W electric mixer is operated for 5 minutes while mixing a 2 kg shake. Assume Csubv=4200 J/kg-K for the liquid. Determine the temperature rise (in degrees C) of the milk shake.
An electric power plant consumes 2.5 million gallons per day of cooling water. To control bacterial growth (slime), 2.0 mg/L of chlorine (measured as Cl2) is injected into the make-up water fed to the system.
The road is in good, dry conditions until 160 ft before the stalled car where it is wet and stays wet for the remaining length. What is the minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitt..
Determine the maximum hoop stresses on the inside fibers of a rifle barrel which is 3 feet long with an O.D. = 3.0" and an I.D. = 1.0". The internal pressure = 10,000 psi. Use the F.E. reference manual for determining these stresses.
Consider a rectangular wastewater treatment cell having a length of 100ft, width of 20ft and depth of 20ft. If the flow into the cell is 50ft^3/min, calculate the residence time of the treatment cell.
Head loss and sunshine striking a pipeline cause the temperature of the water flowing inside to rise by 2 degrees Celsius between two measuring points. Find the heat gain in J/N and cal/N.
A floor slab has a fundamental bending frequency of 10Hz. A shaker is placed at the centre of the slab for a dynamic testing. The tests confirm that the slab displays a damping ratio of 2% of critical.
Which software do we use to calculate force and moment, and draw shear and moment diagram? I really need this software to design my structural project. Please helps me... thank you so much.
The radius of gyration of the torso about O is ko If the car is brought to a sudden stop with a constant deceleration α, determine the velocity v relative to the car with which the model's head strikes the instrument panel. Substitute the values m..
A particular project has 650,000 cubic yards of material weighing 2600 lb/cy. your company has given you up to 10 - 657G tandem powered auger loaded scrapers to use to move the material. the 657g scrapers cost 160/ea per hour to operate and maintain
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