You are conducting a post-blast analysis of acommand-detonated IED attack. The f

Question

You are conducting a post-blast analysis of acommand-detonated IED attack. The firing circuit consisted of a 6.3V battery, firing wire, a switch, and an electric blasting cap.Blasting caps have a resistance of 1.6 and require a currentof 0.45 A to detonate. The resistivity of the firing wire is1.7 x 10-8 *m and the diameter of the wire is1.1 mm. Calculate the maximum length of firing wire that would justallow the blasting cap to still detonate. Answer: 690 m You are conducting a post-blast analysis of acommand-detonated IED attack. The firing circuit consisted of a 6.3V battery, firing wire, a switch, and an electric blasting cap.Blasting caps have a resistance of 1.6 and require a currentof 0.45 A to detonate. The resistivity of the firing wire is1.7 x 10-8 *m and the diameter of the wire is1.1 mm. Calculate the maximum length of firing wire that would justallow the blasting cap to still detonate. Answer: 690 m

Explanation / Answer

first find the resistance of the wire: .     total voltage = totalresistance * current .        6.3  =   (1.6 + R) * 0.45 . R =    12.4 ohms . Then find the cross section area of the wire:   A = r2 = * (0.00055)2 =   9.50334 x 10-7 . Then use resistance of a wire:     R = L / A      or .    L = R A / = 12.4 *9.50334 x 10-7 / 1.7 x 10-8  =   693 meters ˜   690 meters . Then use resistance of a wire:     R = L / A      or .    L = R A / = 12.4 *9.50334 x 10-7 / 1.7 x 10-8  =   693 meters ˜   690 meters

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