205M_test2_version1_S10_solution

205M_test2_version1_S10_solution - Do not write in this...

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Do not write in this table Prob. 1-10 11 12 Pts. 50 30 20 Score Total Answer Problems 1 through 10 on the bubble sheet. Problem 1 (5 pts) Tin has a Young’s modulus of 5 . 0 × 10 9 N/m 2 . A mass of 2.0 kg is attached to a 70 cm long tin wire with a cross sectional area of 8 × 10 7 m 2 . How much does the wire stretch? A. 0 . 34 m B. 3 . 4 × 10 3 mC . 3 . 9 × 10 9 m D. 5 . 6 × 10 9 mE . 4 . 5 × 10 15 m Problem 2 (5 pts) A metal has a density ρ (in kg/m 3 ) and an atomic (molar) mass of M (in kg/mol). Which of the following expressions gives the average length of the interatomic bond in the metal? ( N A =6 × 10 23 in the expressions below.) A. ± M ρ ² 1 / 3 B. ( N A ρ M ) 1 / 3 C. ± M N A ρ ² 1 / 3 D. ( N A ρM ) 1 / 3 E. ± M N A ρ ² Problem 3 (5 pts) Nickel has a Young’s modulus of 2 × 10 11 N/m 2 , an atomic diameter (bond length) of 2 . 2 × 10 10 m ,andanatom icmasso f58 . 7 grams/mol. Consider an atom of nickel in a solid that is oscillating back and forth (as a sound wave travels through the metal, for example). What is the period of the osciallation of this atom? A. 2 . 1 × 10 13 sB . 7 . 3s C .6 . 5 × 10 23 s D. 3 . 0 × 10 13 sE . 9 . 4 × 10 12 s Problem 4 (5 pts) What is the kinetic energy of a proton (mass of 1 . 7 × 10 27 kg)mov ingataspeedo f0 . 95 c ?
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This note was uploaded on 04/18/2010 for the course PY 205M taught by Professor Brown during the Spring '08 term at N.C. State.

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205M_test2_version1_S10_solution - Do not write in this...

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