Unformatted text preview: modulus for its material be 12.5x10 11 dynes/cm 2 and σ for it equal to 0.26, calculate the lateral compression produced. 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 crosssection 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 in stretching a uniform metal wire of area of cross section 106 m 2 and length 1.5 m through 4x 103 m. Given, Y= 2X10 11 N/m 2 ....
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 Spring '11
 dr.sohrabuddin
 Orders of magnitude

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