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Answer Problems 1 through 5 directly on the test page, not in the blue book. Problem 1 (5 pts) The speed of sound in a particular metal is 4900 m/s, the mass of one mole of these metal atoms is 24 grams, and the diameter of an atom in a solid block of this metal is 3 . 1 × 10 10 m. What is the effective stiffness of the interatomic bond in this metal, modeled as a spring? A. 32 N/m B. 6 N/m C. 20 N/m D. 10 N/m E. 16 N/m Problem 2 (10 pts) As shown in the diagram, a ball of mass 15 kg is suspended from a wire, with a compressed spring pushing it away from the wall. The angle θ is 113 degrees. θ wire spring (a, 5 pts) Which of the following diagrams correctly shows all the forces on the block due to objects in the surroundings? Circle your answer below. A. B. C. D. E. (b, 5 pts) What is the magnitude of the force exerted on the block by the spring? Circle your answer below. A. 147 N B. 62 N C. 57 N D. 346 N E. 53 N 3

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Problem 3 (10 pts) y x 1 2 3 The diagram above shows an electron (negatively charged) moving along the path shown from point 1 to 2 to 3 near a gold nucleus (positively charged).
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