Answered: What is the shape factor F12 for the…

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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(6) If a room is to be heated to 70° F. when it is 10° F. outside, (a) what will be the design temperature of an adjacent unheated room, and (b) what will be the value of d?
The diagram below shows a microscopic metal rod with a single crystal structure whose orientation is indicated by the inset. A force of F = 15.7 N is applied to the rod. The cross-sectional area is 1.3 mm2. Calculate the shear stress along the close-packed direction.
Advanced hybrid materials technology has been used in automotive applications. A good example is engine block made of aluminum body with cast iron liner as shown in Figure. Please explain its advantages and possible disadvantages
An external load caused tensile stress is imposed along the [001] of a BCC single crystal. The initial yielding of the crystal causes the coordinate motion of atoms along the direction with how many degrees with respect to the direction of the tensile stress.
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Turbine blades used in jet engines can be made from such materials as nickel-based superalloys. We can, in principle, even use ceramic materials such as zirconia or other alloys based on steels. In some cases, the blades also may have to be coated with a thermal barrier coating to minimize exposure of the blade material to high temperatures. What design parameters would you consider in selecting a material for the turbine blade and for the coating that would work successfully in a turbine engine? Note that different parts of the engine are exposed to different temperatures, and not all blades are exposed to relatively high operating temperatures. What problems might occur? Consider factors such as temperature and humidity in the environment in which the turbine blades must function.
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A current problem in the U.S. Air Force is the neck/shoulder fatigue experienced by pilots. To be able to fly missions at night, the pilots wear night vision goggles, which are attached to the front of the helmet. Unfortunately, these are heavy, causing a large downward torque of the head, which must be counteracted by the neck muscles, which then fatigue. To alleviate this problem, many pilots have started attaching random lead weights to the back of the helmet. Find the appropriate weight that would best balance the head and minimize neck fatigue – You must show your free body diagram. Assumptions: a) center of gravity of goggles is 20 cm in front of neck pivot point, b) load of goggles1.0 kg mass, c) center of gravity of lead weight is 10 cm behind neck pivot point, d) load of bare helmet 3 kg mass, e) center of gravity of helmet is 2 cm in front of neck pivot, f) load of head 4.0 kg mass, and g) center of gravity of head is right at neck pivot point. Answer: ___________________
A cylindrical specimen having a cross-section of radius, r, is subjected to a uniaxial tensile force, F, as shown in the accompanying figure. Establish a criterion for the selection of light and stiff materials for this bar (Hints: You need to develop an expression for the mass of material required in terms of tension, bar length, density, and stiffness of the material). M
Question (3): At a temperature of 5°C, 3 mm gap exists between two polymer bars and rigid support, as shown in the (Fig.3). Bar (1) is 50 mm wide and 20 mm thick [E = 800 Mpa, a = 140 x 10-6/°C ]. Bar(2) is 75 mm wide and 25 mm thick [E = 2.7 Gpa, a = 67 x 10-6/°C]. The supports at A and C are rigid. Determine the lowest temperature at which the 3mm gap is closed, the normal sresses in the bars(1) & (2) and the normal strains in the bars (1) & (2). 3 Best wishes Fig. 3 (1) 3-mm gap 50 mm 700 mm 2 B 75 mm 400 mm (2) C
If the plate thickness in the previous problem were 1 cm, would the thickness be sufficient for a JIC test? Assume these material properties: E = 205 GPa, v = 0.25.

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What is the shape factor F12 for the situation shown in Fig. 1 below ? O 1.1 2m 2 m 0.001 O 0.33 3 m Fig. 1 (careful with labelling!) 0.105 0.205 1 Don't know. 2 5m 90°