11. An open air column of length 1.40 m is in air at 24.2 °C. What is the frequency of the third harmonic?
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- 10. An organ pipe is 118 cm long. What is the third audible harmonic if the pipe is open at both ends? The speed of sound in air is 345 m/s. HzProblem 2: When mass M is tied to the bottom of a long, thin wire suspended from the ceiling, the wire's second-harmonic frequency is 200 Hz. Adding an additional 1.0 kg to the hanging mass increases the second-harmonic frequency to 245 Hz. What is M?A person putting up power lines is told to stretch the wire between poles to a tension of about 800N. The person doesn't have a tension scale so they decide to measure the speed of a pulse created on the wire when they hit it with a wrench. The pulse travels from one pole 60m to another pole and back again in 2.6 s. The 60m long wire has a mass of 15kg. Should the wire be tightened or loosened? Explain how you decided. Thanks!
- 4. A tug boat horn emits a frequency of 250 Hz in 18 °C air, which has a speed of sound of 342 m/s. If the tug boat is moving away from a stationary observer at 15 m/s, what is the frequency that is observed? Sobs = ? Ssource= f = f obs VIV source V±V source source 5. A jogger runs at 9 m/s, and is trailed by a bumblebee moving at 5 m/s and emitting a frequency of 270 Hz. if the speed of sound in air was 336 m/s?What is the radius of a wire that has a wave velocity of 225m / s when stretched with a tension of 150 N? The density of the wire is 8.60x103 kg / m3.a. A wooden flute, open at both ends, is 0.5 m long. Determine its fundamental vibration frequency assuming the speed of sound in air is 340 m/s b. How far from one end should a finger hole be placed to produce a sound whose frequency is 44 times that calculated in the first part.
- 2. A hiker shouts and hears the echo reflected from a cliff wall 3.80 s later. If the air temperature is 20°C, how far is the hiker from the cliff? (Assume no wind.) m 2 W S X H 2 113 mand 3 E D . с $ 4 R F % 5 V T G 6 MacBook Pro B Y H 9 N U 00. 8 J I M ( 0. 9 K C O - V I дв H .C O L P command ill > **** x { E optionA 0.485-m-long brass pipe open at both ends has a fundamental frequency of 347 Hz. (The coefficient of linear expansion for brass is 19 ✕ 10−6 °C−1.) a) Determine the temperature of the air in the pipe. b) If the temperature is increased by 22.0°C, what is the new fundamental frequency of the pipe? Be sure to include the effects of temperature on both the speed of sound in air and the length of the pipe.4. For the following, identify the speed of the wave f(x, t) and the direction it is travelling. (a) f(x, t) = 10 cos(10x + 3t) (b) f(x, t) = −2 sin(2x − 4t — π)
- From 791. ssm At 20 °C the densities of fresh water and ethyl alcohol are, respectively, 998 and 789 kg/m³. Find the ratio of the adiabatic bulk modulus of fresh water to the adiabatic bulk modulus of ethyl alcohol at 20 °C.9. A steel piano wire is 70.0 cm long and has a mass of 2.90 g. If the tension of the wire is 590 N, what is the fourth harmonic frequency? Hz 136 36 skp1307 skp136 skp136 sk skp136