Question

rn A specimen of copper having a rectangular cross section 15.2 mm x 19.1 mm is pulled in tension with 44,500 N force, producing only elastic deformation. Calculate the resulting strain. Round off the answer to three significant figures. Answer: 1.394e-3 A cylindrical specimen of a nickel alloy having an elastic modulus of 207 GPa and an original diameter of 10.2 mm experiences only elastic deformation when a tensile load of 8900 N is applied. Compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm. Express the answer in mm to three significant figures. Answer 475 An aluminum bar 125 mm long and having a square cross section 16.5 mm on an edge is puled in tension with a load of 66,700 N and experiences an elongation of 0.43 mm. Assuming that the deformation is entirely elastic, calculate the modulus of elasticity of the aluminum. Express the answer in GPa to three significant figures. Answer: 69 Consider a cylindrical nickel wire 2.0 mm in dliameter and 3 x 101 mm long. Calculate its elongation when a load of 300 N is applied. Assume that the deformation is totally elastic. Express the answer in mm to three significant figures

Answer 1

ven Dimension ol rectanqular sur facIs.2 mm X 19.1 mm Force ap Led = 44500 N Now, Stress () ts defined as loadappied. by b cross seclional arca te Stress ( P Load applied Cross sedional area Also, strain (E)- AL Change" ผ้า lergth Original lengtb oung Modulus (y) e σ, e Stress Strain Calculating cross section area 15.2 mm x 19.1 mm 290.32 mnm 290 32 x 10-G. m2 young modulis of Copper - II7 x 109 Nm2 Substituting Ín "stress equation : Stress ( 44500 N 290-32 xlo-6

Question 02:

wen , F=8900 N For a clindrical specimen 0 equohion 6) Original length

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