Unformatted text preview: 6. (a) A wire, 4 m long and 0.3 mm in diameter, is stretched by a force of 800 gm wt. If the extension in length amounts to 1.5 mm, calculate the energy stored in the wire. (b) Find the work done in Joules in stretching a wire of cross-section 1 mm 2 and length 2m through 0.1 mm if Young’s modulus for the material of the wire is 2x10 12 dynes/cm 2 . 7. The young’s modulus of a metal is 2X10 11 N/m 2 and its breaking stress is 1.078 X 10 9 N/m 2 . Calculate the maximum amount of energy per unit volume which can be stored in the metal when stretched. 8. Calculate the work done per unit volume in stretching a uniform metal wire of area of cross section 10-6 m 2 and length 1.5 m through 4x 10-3 m. Given, Y= 2X10 11 N/m 2 . 9. Find the work done in stretching a uniform metal wire of 1 sq mm cross section and 2 m long through 0.1 mm. Given, Y = 2×10 11 N/m 2 . 1...
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- Spring '11