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All Textbook Solutions for Physics: Principles with Applications

59GP 60GP 61GP 62GP 63GP 64GP 65GP 66GP 67GP 68GP 69GP 70GP 71GP 72GP 73GP 74GP 75GP 76GP 77GP 78GP 79GP 80GP 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q 9Q 10Q 11Q 12Q 13Q 14Q 15Q 16Q 17Q 18Q 19Q 20Q 21Q 22Q 23Q 24Q 1P 2P 3P 4P 5P 6P 7P 8P 9P 10P 11P 12P 13P 14P 15P 16P 17P 18P 19P 20P 21P 22P 23P 24P 25P 26P 27P 28P 29P 30P 31P 32P 33P 34P 35P 36P 37P 38P 39P 40P 41P 42P 43P 44P 45P 46P 47P 48P 49P 50P 51P 52P 53P 54P 55P 56P 57P 58P 59P 60P 61P 62P 63GP 64GP 65GP 66GP 67GP 68GP 69GP 70GP 71GP 72GP 73GP 74GP 75GP 76GP 77GP 78GP 79GP 80GP 81GP 82GP 83GP 84GP 85GP 86GP 87GP 88GP 1. Is the acceleration of a simple harmonic oscillator ever zero? If so. where? 2Q How could you double the maximum speed of a simple harmonic oscillator (SHO)?For a simple harmonic oscillator, when (if ever) are the displacement and velocity vectors in the same direction? When are the displacement and acceleration vectors in the same direction?Two equal masses are attached to separate identical springs next to one another. One mass is pulled so its spring stretches 40 cm and the other is pulled so its spring stretches only 20 cm. The masses are released simultaneously. Which mass reaches the equilibrium point first?S. What is the approximate period of your walking step?What happens to the period of a playground swing if you rise up from sitting to a standing position?Is the frequency of a simple periodic wave equal to the frequency of its source? Why or why not?9Q What kind of waves do you think will travel along a horizontal metal rod if you strike its end (a) vertically from above and (b) horizontally parallel to its length?Since the density of air decreases with an increase in temperature, but the bulk modulus Bis nearly independent of temperature, how would you expect the speed of sound waves in air to vary with temperature?How did geophysicists determine that part of the Earth's interior is liquid?13Q 14Q 15Q 16Q 17Q 18Q Why do the strings used for the lowest-frequency notes on a piano normally have wire wrapped around them?20Q 21Q 22Q 1P 2P 3P 4P 5P 6P 7P 8P 9P 10P 11P 12P 13P 14P 15P 16P 17P 18P 19P 20P 21P 22P 23P 24P 25P 26P 27P 28P 29P 30P 31P 32P 33P 34P 35P 36P 37P 38P 39P 40P 41P 42P 43P 44P 45P 46P 47P 48P 49P 50P 51P 52P 53P 54P 55P 56P 57P 58P 59P 60P 61P 62P 63P 64P 65P 66P 67GP 68GP 69GP 70GP 71GP 72GP 73GP 74GP 75GP 76GP 77GP 78GP 79GP 80GP 81GP 82GP 83GP 84GP 85GP 86GP 87GP 88GP 1Q 2Q 3Q When a sound wave passes from air into water, do you expect the frequency or wavelength to change?What evidence can you give that the speed of sound in air does not depend significantly on frequency?6Q How will the air temperature in a room affect the pitch of organ pipes?8Q 9Q 10.A noisy truck approaches you from behind a building. Initially you hear it but cannot see it. When it emerges,and you do see it, its sound is suddenly 'brighter—you hear more of the high-frequency noise Explain. [Hint:See Section 11-14on diffraction] 11Q 12Q Traditional methods of protecting the hearing of people who work in areas with very high noise levels have consisted mainly of efforts to block or reduce noise levels. With a relatively new technology, headphones are worn that do not block the ambient noise Instead, a device is used which detects the noise, inverts it electronically, then feeds it to the headphones in addition to the ambient noise. How could adding morenoise reduce the sound levels reaching the ears?14- Consider the two waves shown in Fig. 12-31.Each wave can be thought of as a superposition of two sound waves with slightly different frequencies as in Fig. 12-18 .In which of the waves, (a) or (b), are the two component frequencies farther apart? Explain. Figure 12-31 Is there a Doppler shift if the source and observer move in the same direction, with the same velocity? Explain 16Q 17Q 1P 2P (a) Calculate the wavelengths in air at 20°C for sounds in the maximum range of human hearing, 20 Hz to 20,000 Hz. (b) What is the wavelength of an 18-MHz ultrasonic wave?4P What is the intensity of a sound at the pain level of 120 dB? Compare it to that of a whisper at 20 dB 6P 7P What is the sound level of a sound whose intensity is 1.5 x 10-6 W/m2?At a rock concert, a dB meter registered 130 dB when placed 2.5 m in front of a loudspeaker on stage. (a) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air? (b) How far away would the sound level be 85dB?10P 11P 12P 13P 14P 15P 16P 17P 18P 19P 20P 21P 22P 23P 24P 25P 26P 27P 28P 29P 30P 31P 32P 33P 34P 35P 36P 37P 38P 39P

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