A rectangular nylon [E = 8 GPa; v=0.35; a = 34 x 10-6/°C] plate has a circular hole in its center. At an initial temperature of T₁ = 23°C, the plate width is b = 380 mm, the plate height is h = 220 mm, the diameter of the central hole is d = 60 mm, and the thickness of the plate is t = 28 mm. At a final temperature of T₁ = 58°C, determine (a) the diameter d of the central hole. (b) the thickness t of the plate. b Answers: (a) df = i (b) t= i mm mm

A rectangular nylon [E = 8 GPa; v=0.35; a = 34 x 10-6/°C] plate has a circular hole in its center. At an initial temperature of T₁ = 23°C, the plate width is b = 380 mm, the plate height is h = 220 mm, the diameter of the central hole is d = 60 mm, and the thickness of the plate is t = 28 mm. At a final temperature of T₁ = 58°C, determine (a) the diameter d of the central hole. (b) the thickness t of the plate. b Answers: (a) df = i (b) t= i mm mm

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

See similar textbooks

Similar questions

Two flat infinite slabs, each 5 m thick, are each initially uniform in temperature, with one being at 0° and the other at 20°. At t=0, the two slabs are stacked together (the warmer one at larger y) and both the top and bottom surfaces of the stack are kept at 0°. Find the temperature in the stacked slabs as a function of y and t for t > 0. Write out the heat flow equation, find the general solution, and the specific solution for this arrangement.
Find the steady-state temperature distribution in a (very long) solid cylinder if the boundary temperatures are T(s=0, θ, z)=0 and T(s, θ, z=0)=s*sinθ
An insulated vertical cylindrical vessel of cross- sectional area A = 0.12 m² contains 20 mol of He gas at To = 300 K and Po= 0.5 bar. It is capped by a movable piston of mass m = 150 kg supported from the ceiling by a wire. The top of the vessel is open to the atmosphere (Patm= 1 bar, Tatm= 300K). The wire is cut and the weight falls and com- presses the gas. Patm 160 E Wir og SLOWA He gas 1019 (a) Obtain the pressure and temperature of the gas a short time after the wire has been cut, when a negligible amount of heat transfer has taken place. Comment on whether your solution takes into account the inevitable oscillations of the piston around its equilibrium position before it comes to rest. mut Ispl (b) After a long time, the He gas thermally equilibrates with the environ- ment by heat transfer through the piston. How much heat is exchanged with the environment during this process? Helium can be considered an ideal gas at all conditions of interest, with C₁=3R/2. INST
Solve it
None
3-52 A 4-m-high and 6-m-wide wall consists of a long 18-cm X 30-cm cross section of horizontal bricks (k = 0.72 W/m . °C) separated by 3-cm-thick plaster layers (k = 0.22 W/m . °C). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m - °C) on the inner side of the wall. The indoor and the outdoor temperatures are 22°C and −4°C, and the convec- tion heat transfer coefficients on the inner and the outer sides are h₁ = 10 W/m² . °℃ and h₂ = 20 W/m². °C, respectively. Assuming one-dimensional heat transfer and disregarding radi- ation, determine the rate of heat transfer through the wall. Foam Plaster Brick 1+₂+18 2 FIGURE P3-52 18 cm N 1.5 cm 30 cm 1.5 cm
3- Derive the rule-of-mixtures equation (a₂ = a{V₁ + amVm) for the coefficient of thermal expansion α₂
The composite wall which is composed of 10 cm brick (k=0.40 W/m2-C), 2 cm cellotex (k=0.03 W/m2- OC), and 6 cm (k=0.30 W/m2-OC),has an outer (brick) temperature T=23 OC and an inner (plaster)temperature T=90 OC. Find the temperature between the cellotex andplaster in OC.
At a given moment in time, the temperature distribution inside an infinite homogeneous body is given by the function T(x, y, z) = x² – 2y² – xy + 2yz. Considering constant properties and no heat generation inside the body, determine the regions where the temperature varies over time
An open cylinder of air has a radius of 38.0 cm and a height of 50.0 cm, as shown in figure (a). 50.0 cm The air pressure is 1.00 atm and the temperature is 13.5°C. A 25.0 kg piston is then lowered onto the cylinder, forming an airtight seal, as shown in figure (b). The air inside is compressed until the piston reaches equilibrium (mechanical and thermal), and at this point the piston is a height h; from the bottom of the cylinder. Lastly, a 27.5 kg dog steps onto the piston, and the air in the cylinder again compresses, as show in figure (c). After reaching equilibrium, the air inside is again at 13.5°C, and the height of the piston decreases a distance Ah as shown. (a) What is the distance Ah (in mm) that the piston moves when the dog is on it? mm (b) To what temperature (in °C) should the gas be warmed to raise the piston and the dog back to h;? °C