# L41 - Remember:ThisWeek CAPA assignment#14 is due...

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Remember: This Week CAPA assignment #14 is due thisevening at 10 PM, to be done on -line. Read: Ch. 11: Vibrations and Waves. Ch. 11.1-11.4, 11.7, 11.8, 11.11-11.13. Also Ch. 12.1 &12.4 on sound waves. Also Read: Ch. 13-2, 13-4, 13-7, 13-9, 14-1, 14-2 through 14-5. FINAL EXAM: TWELVE DAYS FROM TODAY! Wednesday May 5, G1B20 & G1B30, 4:30 – 7:00 PM L41 F 4/23/10 1 Physics 2010

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Extra Problems from Giancoli Ch. 9, Statics: p. 247-254; 7, 15, 18, 23, 31. Ch. 10, Fluids: p. 281-285; 3, 5, 9, 11, 22, 25, 29, 36, 37, 38. Ch. 11, Vibrations & Waves: p. 316-321; 3, 7, 11, 17, 22, 29, 33, 37, 52, 53, 56, 61. L41 F 4/23/10 2 Physics 2010
L41 F 4/23/10 Physics 2010 3 Simple Harmonic Oscillator F = ma = kx (Hooke's Law) x = A sin ω t = A sin(2 π ft ) = A sin(2 t / T ) = k m f = 2 = 1 2 k m T = 1 f = 2 m k

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L41 F 4/23/10 Physics 2010 4 Simple Harmonic Oscillator Note: E tot = KE + PE KE = ½ mv 2 PE = ½ kx 2 E tot = ½ kA 2 = ½ mv 2 max v max = A (k/m) 1/2 E tot = ½ mv 2 + ½ kx 2 = ½ kA 2 a = -(k/m)x (acceleration and displacement are “out of phase” by 180 degrees.) velocity and displacement are out of phase by 90 degrees. F = ma = kx (Hooke's Law)
The position of a mass on a spring as a function of time is shown below. When the mass is at point P on the graph, which of the following statements about velocity and acceleration are true?

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L41 - Remember:ThisWeek CAPA assignment#14 is due...

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