**33. ssm A solid cylinder is radiating power. It has a length that is ten timesits radius. It is cut into a number of smaller cylinders, each of which has thesame length. Each small cylinder has the same temperature as the originalcylinder. The total radiant power emitted by the pieces is twice that emittedby the original cylinder. How many smaller cylinders are there?

Given data: The radius of cylinder is, r. The length of the cylinder is, l = 10r. The initial…

Answered: **33. ssm A solid cylinder is radiating…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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PART ( D & E) Only SOLVE CAREFULLY!! Please Write Clearly and Box the final Answer(s) Label them
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31
The rate of radiation heat transfer per unit area from a black surface is directly proportional to the fourth power of the absolute temperature of a surface. A. Boltzmann’s Law B. Kirchoff’s Law C. Newton’s Law of Coding D. Fourier’s Law
1. This problem concerns the difficulty of directly detecting Earth-like planets.The Bond albedo for the Earth is 0.29. Calculate the fraction of the total emitted light fromthe Sun that is reflected by the Earth.
An industrial engineer designed a workstation where the seeing task was difficult because of the size of the components going into the assembly. The desired brightness was 150 foot Lamberts and the workstation was painted a medium green having a reflectance of 52%. fc (Please keep as an integer) (2) By referring to the table in slide 7 (lecture 5), please estimate the required illumination if you repainted the workstation with a light cream paint: (1) What illumination would be required at this workstation to provide the desired brightness ? fc (Please keep as an integer)
Derive the expression for radiation heat exchange between two gray surfaces connected by single refractory surface.
3. How to use radiation in food preservation process. What is the health issue related consumption of radiated foods?. 4. Compare the rapid and slow freezing in details .
You can neglect radiation at the bottom of the plate; the bottom side of the plate has water flowing underneath it. Often, when dealing with liquids (rather than gases), one can neglect radiation because heat transfer due to convection is so much larger (liquids tend to have higher convection coefficient values than gases).
A 3-in-diameter cylindrical wire is coated in 3 inches of polyethylene insulation. The wire can be modeled as a grey body with an emissivity of .85. Due to the electrical resistance, the wire is at a temperature of 300 degrees Celsius. The insulation is also a great body with an emissivity of .95, at a temperature of 40 degrees Celsius. (Assume F12=1). What is the heat flux (W/m^2) of the energy going from the wire to the insulation?
•• ENGINEERING APPLICATION An optical fiber allows rays of light to propagate long distances by using total internal reflec- tion. Optical fibers are used extensively in medicine and in digital communications. As shown in Figure 31-58 the fiber consists of a core material that has an index of refraction n, and radius b sur- rounded by a cladding material that has an index of refraction n< n,. The numerical aperture of the fiber is defined as sin e,, where 0, is the angle of incidence of a ray of light that impinges on the center of the end of the fiber and then reflects off the core- cladding interface just at the critical angle. Using the figure as a guide, show that the numerical aperture is given by sin0, = Vn3 – n? assuming the ray is initially in air. Hint: Use of the Pythagorean theorem may be required. 44 Incident ray n3- n2 a 10, 0 2 b FIGURE 31- 58 Problems 44, 45, and 46 •• ENGINEERING APPLICATION Find the maximum angle of incidence 0, of a ray that would propagate through an…

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