Day 12, Physics 131.

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Presentation transcript:

Day 12, Physics 131

HW Problem 14-4 A tsunami traveling across deep water can have a speed of 750 km/hr and a wavelength of 310 km. ? What is the frequency of such a wave ?

HW Problem 14-14 A brother and sister try to communicate with a string tied between two tin cans. Given: the string is 9.5 m long, has a mass of 32 g, and is pulled taut with a tension of 8.6 N. ? How much times does it take for a wave to travel from one end of the string to the other ?

HW Problem 14-30 When you drop a rock into a well, you hear the splash 1.5 seconds later. ? (a) How deep is the well ? ? (b) If the depth of the well were doubled, would the time required to hear the splash be greater than, less than, or equal to 3.0 s ? Explain ??

HW Problem 14-3 In a pig-calling contest, a caller produces a sound with an intensity level of 110 dB. ? How many callers would be required to reach the pain level of 120 dB ? Prove it!

HW Problem 14-50 You hear the siren of an approaching fire truck, so you pull over and stop. As the truck approaches, you hear a tone of 460 Hz; as the truck recedes, you hear a tone of 410 Hz. ? How long will it take for the truck to get from your position to the fire 5.0 km away, assuming it maintains a constant speed ?

HW Problem 14-61 A pair of in-phase stereo speakers is placed side by side, 0.85 m apart. You stand directly in front of one of the speakers, 1.1 m from the speaker. ? What is the lowest frequency that will produce constructive interference at your location ?

HW Problem 14-72 A guitar string 66 cm long vibrates with a standing wave that has three antinodes. ? (a) which harmonic is this ? ? (b) What is the wavelength of this wave ?

HW Problem 4-80 Two tuning forks have frequencies of 278 Hz and 292 Hz. ? What is the beat frequency if both tuning forks are sounded simultaneously ?