Q3/ A copper fin k =390 W/m2. °C 2.0 mm thick and 15 mm long protrudes from a wall as in Figure below. The base is maintained at 300 C, and the ambient temperature is 45 °C with h=10 W/m2. °C. Calculate the heat loss from the fin per .unit depth of material T = 45 °C T= 300 °C h = 10 W/m. °C t= 2 mm L= 15 mm

Q3/ A copper fin k =390 W/m2. °C 2.0 mm thick and 15 mm long protrudes from a wall as in Figure below. The base is maintained at 300 C, and the ambient temperature is 45 °C with h=10 W/m2. °C. Calculate the heat loss from the fin per .unit depth of material T = 45 °C T= 300 °C h = 10 W/m. °C t= 2 mm L= 15 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

Find the minimum amount of diameter for the insulation of a spherical water tank? Radius of the tank is 10 m, thermal conductivity is 25 W/(m^2*K) and convective coefficient is 5 W/(m*K)
. A circular fin has D = 1 cm, L = (15) cm, k = 100 W/mK, and h = 25 W/m2 K. Find finefficiency.
Steel railroad reels 15 m long are laid with a clearance of 5 mm at a temperature Ti = 34 °C. Assume α = 11.7 μm/(m·°C) and E = 200 GPa. At what temperature in °C will the rails just touch?
An elastic rod with a cross-sectional area A = 2mm2 is stretched from an intial legth of 1.0m to a final legth of 1.1m at a constant tempreture of 15 degrees celcius . Calculate the heat exchanged between the elastic rod and its surroundings if it is made of a material with a isothermal Youngs modulus ET = 150GPa and a linear expansivity at constant tension af = 15 x 10 -6 K-1. a) 129.6675 J b) -129.6675 J c) -6.75 J d) 6.75 J
Two cylinders, 0.75 m in diameter (upper cylinder is 1.5 m long, k = 0.5 W/m-K; lower cylinder is 1.1 m long, k = 1.3 W/m-K) are inside a frustum of a square pyramid (k = 0.053 W/m-K) as shown in the diagram. The upper face is at 250 oC and the lower base is at 100 oC. Calculate the resistance in A (in K/W).
The steel rails of a railroad are 12 m with a clearance of 3 mm at 15 oC. Calculate: 1.1 The change in temperature that will cause the rails to touch. 1.2 The stresses that would be induced at this new temperature if there were no initial clearance (E = 200 GPa and α = 12 × 10-6 /oC).
A 540-N uniform rectangular sign 4.00 m wide and 3.00 m high is suspended from a horizontal, 6.00-m-long, uniform, 140-N rod as indicated in the figure below. The left end of the rod is supported by a hinge and the right end is supported by a thin cable making a 30.0° angle with the vertical. (Assume the cable is connected to the very end of the 6.00-m-long rod, and that there are 2.00 m separating the wall from the sign.) (a) Find the (magnitude of the) tension T in the cable.N(b) Find the horizontal and vertical components of the force exerted on the left end of the rod by the hinge. (Take up and to the right to be the positive directions. Indicate the direction with the sign of your answer.) horizontal component _____N vertical component _____N
The two cylindrical rod segments shown in the figure below (Figure 1) are fixed to the rigid walls such that there is a gap of 0.01 in. between them when T1=75 degrees F . Each rod has a diameter of 1.5 in. Take αal=13(10^-6)/∘F ,Eal=10(10^3)ksi, (σY)al=40ksi, αcu=9.4(10^−6)/∘F, (σY)cu=50ksi, and Ecu=15(10^3)ksi. a) What larger temperature T2 is required in order to just close the gap? b) Determine the magnitude of the average normal stress in each rod if T2=350∘F
A 200 kg load is hung on a wire of length 4 m, cross sectional area of 0.2 x 10 -4 m2 and Young’s modulus of 8 x 1010 Pa. What is its increase in length?
A 1.5-m-diameter cylindrical tank is formed of 6-mm-thick sheet steel (E = 200 Gpa, ν = 0.3). The maximum shear strain occurring in this tank when the contents pressure is 1 MPa, is:
A 10 kg axial load is uniformly carried by an aluminum alloy pipe with an outside diameter of 10 cm and an inside diameter of 9.6 cm. The pipe is 1.2 m long, Young's modulus for the aluminum alloy is 75 GPa. How much is the pipe compressed?
A shaft having length equal to 10 m and diameter equal to 70mm is simply supported at both ends. The shaft carries four masses 170 kg, 220 kg, 270kg and 320 kg. These masses are located at a distance of 1.5 m, 2.5 m, 5.5 m and 7.5 m from the left hand side support, respectively. The modulus of elasticity, E, for the material of the shaft is 200 GN/m2 and mass density for the shaft material is 7500 kg/m3. Determine critical speed of the shaft in revolutions per minute for the following two cases: Effect of the mass of the shaft is neglected. Effect of the mass of the shaft is considered. What is the usefulness of the answers determined in this problem?