Ch13_TestBank - Chapter 13, Vibrations and Waves CHAPTER 13...

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Chapter 13, Vibrations and Waves 182 C HAPTER 13 13.1 Hooke’s Law 1. The SI base units for spring constant are which of the following? a. kg·s 2 b. kg/m 2 c. kg/s 2 d. kg·m 2 2. A large spring requires a force of 150 N to compress it only 0.010 m. What is the spring constant of the spring? a. 125 000 N/m b. 15 000 N/m c. 15 N/m d. 1.5 N/m 3. A 0.20-kg object is attached to a spring with spring constant k = 10 N/m and moves with simple harmonic motion over a horizontal frictionless surface. At the instant that it is displaced from equilibrium by - 0.050 m, what is its acceleration? a. 1 000 m/s 2 b. - 40 m/s 2 c. 0.1 m/s 2 d. 2.5 m/s 2 4. Tripling the weight suspended vertically from a coil spring will result in a change in the displacement of the spring’s lower end by what factor? a. 0.33 b. 1.0 c. 3.0 d. 9.0 5. Tripling the displacement from equilibrium of an object in simple harmonic motion will bring about a change in the magnitude of the object's acceleration by what factor? a. 0.33 b. 1.0 c. 3.0 d. 9.0
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Chapter 13, Vibrations and Waves 183 6. A tiny spring, with a spring constant of 1.20 N/m, will be stretched to what displacement by a 0.005 0-N force? a. 4.2 mm b. 6.0 mm c. 7.2 mm d. 9.4 mm 7. A mass of 0.40 kg, attached to a spring with a spring constant of 80 N/m, is set into simple harmonic motion. What is the magnitude of the acceleration of the mass when at its maximum displacement of 0.10 m from the equilibrium position? a. zero b. 5 m/s 2 c. 10 m/s 2 d. 20 m/s 2 8. A mass of 4.0 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 20 N/m and on the left to a horizontal spring with spring constant 50 N/m. If this system is moved from equilibrium, what is the effective spring constant? a. 30 N/m b. –30 N/m c. 70 N/m d. 14 N/m 9. Suppose there is an object for which F = + kx . What will happen if the object is moved away from equilibrium ( x = 0) and released? a. It will return to the equilibrium position. b. It will move further away with constant velocity. c. It will move further away with constant acceleration. d. It will move further away with increasing acceleration. 10. Which is not an example of approximate simple harmonic motion? a. A ball bouncing on the floor. b. A child swinging on a swing. c. A piano string that has been struck. d. A car's radio antenna as it waves back and forth. 11. If it takes 4.0 N to stretch a spring 6.0 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 3.0 cm? a. 2.0 N b. 4.0 N c. 8.0 N d. 16 N
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Chapter 13, Vibrations and Waves 184 12. Three identical springs each have the same spring constant k . If these three springs are attached end to end forming a spring three times the length of one of the original springs, what will be the spring constant of the combination? a.
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Ch13_TestBank - Chapter 13, Vibrations and Waves CHAPTER 13...

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