EXERCISE 4.21. Three long parallel wires equal in length are supporting a rigid bar connected at their bottoms asshown in Fig. 4.15. If the cross-sectional area of each wire is 100 mm“, calculate the stresses ineach wire. Take E, = 100 GPa and E, = 200 GPa.[Ans. O, = 25 MPa ; o, = 50 MPa]10 kN220 kNFig. 4.15Fig. 4.162. Three wires made of copper, zinc and aluminium are of equal lengths and have cross-sectionalareas of 100, 150 and 200 square mm respectively. They are rigidly connected at their ends asshown in Fig. 4.16. If this compound member is subjected to a longitudinal pull of 220 kN,estimate the load carried on each wire. Take E = 130 GPa, E, = 100 GPa and E, = 80 GPa.[Ans. Pe= 65 kN, P,= 75 kN, P= 80 kN]3. Two steel rods and one copper rod each of 20 mm diameter together support a load of 50 kN asshown in Fig.4.17. Find the stresses in each rod. Take E for steel and copper as 200 GPa and[Ans. o. = 39.8 MPa ; o, = 59.7 MPa]100 GPa respectively.60 I Strength of Materials50 kNCopper wire1.6 mm oSteel wire0.9 mm o4.5 m1.5 m500 mm2 m200 NFig. 4.17Fig. 4.184. Two vertical wires are suspended at a distance of 500 mm apart as shown in Fig. 4.18. Theirupper ends are firmly secured and their lower ends support a rigid horizontal bar, which carriesa load of 200 N. The left hand wire has a diameter of 1.6 mm and is made of copper, and theright hand wire has a diameter of 0.9 mm and is made of steel. Both wires, initially, are 4.5metres long. Determine :(a) Position of the line of action of the load, if both the wires extend by the same amount.(b) Slope of the rigid wire, if the load is hung at the centre of the bar. Neglect weight of the bar.[Ans. 170 mm ; 0.15°]Take E for copper as 100 GPa and E for steel as 200 GPa.CopperSteel

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1. Three long parallel wires equal in length are supporting a rigid bar connected at their bottoms as shown in Fig. 4.15. If the cross-sectional area of each wire is 100 mm, calculate the stresses in each wire. Take E, = 100 GPa and E, 200 GPa. (Ans. O, = 25 MPa ; o, = 50 MPa] %3D

1. Three long parallel wires equal in length are supporting a rigid bar connected at their bottoms as shown in Fig. 4.15. If the cross-sectional area of each wire is 100 mm, calculate the stresses in each wire. Take E, = 100 GPa and E, 200 GPa. (Ans. O, = 25 MPa ; o, = 50 MPa] %3D

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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