39. An observer stands 25 m behind a marksman practicing at a riflerange. The marksman fires the rifle horizontally, the speed of the bul-lets is 840 m/s, and the air temperature is 20 °C. How far does eachbullet travel before the observer hears the report of the rifle? Assumethat the bullets encounter no obstacles during this interval, and ignoreboth air resistance and the vertical component of the bullets' motion.

Speed: v=distancetime Given: Distance between marksman and observer, d=25 m Speed of bullet, vb=840…

Answered: 39. An observer stands 25 m behind a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Pr5. Two identical loudspeakers are located at points (-10,0,0) and (0,0, 10) of our coor- dinate system, where the numbers in the brac- kets correspond to the (r, y, z) coordinates of the points, expressed in meters. The loudspeakers are driven by the same oscillator with a frequ- ency of 170 Hz. The speed of sound in air can be considered 340 m/s. a) Give the coordinates of those points loca- ted on the positive r axis where the sound waves coming from the two loudspeakers interfere con- structively. b) A receiver is started to move slowly from the origin (0,0,0) along a path lying in the r-y plane so that it receives constant sound intensity throughout its slow motion. What is the shape of the path the receiver should take?
A violin string of length 32.8 cm that sounds the note is under a tension of 50 N and has a mass per length of 0.6 grams per meter. How many round trips are completed per second? This tells you the frequency of the sound produced by the string.
The auditory canal of the outer ear acts as a closed end resonator which has a natural frequency of around 3500 Hz. This canal serves to amplify sounds with frequencies around this value, thus making us more sensitive to such frequencies. If the speed of waves inside the canal is 350 m/s, then what is the estimated length of the canal?
A projectile is approaching you at 50 m/s and whistling with a frequency of 300 Hz if heard by an observer on the projectile. You are running away from the projectile at 10 m/s. You hear a frequency Group of answer choices 300 Hz. varying about 300 Hz. lower than 300 Hz. higher than 300 Hz. which is that of your scream.
Two progressive waves yj = A sin( 4 x - ot) and y2 = A sin( 2" x – ot – 5) travel in the same direction. Calculate the velocity of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 =8.7 m and w =12.7 rad/s (radian per second). Give your answer in Sl units.
While running on the sidewalk at 5.2m/s , you hear an ambulance approaching you from behind. It is traveling at 27.8m/s with respect to the road. If the ambulance has a siren with a frequency of 2.30x10°Hz and the speed of sound is 343m/s , at what frequency do you hear the siren?
An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 8 s?
The vehicle's 6-cylinder engine speed is 3200 RPM. What frequency does the engine produce in the opinion of a stationary observer when the vehicle in question is moving away from him at a speed of 100 km / h? Give the answer in Hertz with integer precision. The speed of sound in the air is 340 m / s.
18. A sound wave s(r, t) = sm Cos(ka – wt +o) travels at 343 m/s through air in a long horizontal tube. At one instant, air molecule A at r = 2.00 m is at its maximum positive displacement of 6.0 nm and air molecule B at r = a positive displacement of 1.5 nm. All the molecules between A and B arc at intermediate displacements. What is the 2.05 m is at frequency of the wave? (1) 1400 Hz (2) 1300 Hz (3) 1200 Hz (4) 1100 Hz (5) 1000 Hz
A steel cable 3.0cm in diameter is kept under a tension of 10kN. The density of steel is 7.8g /cm 3. With what speed would transverse waves propagates along the cable?
The range of human hearing extends from approximately 20 Hz to 20000 Hz. Find the wavelengths of these extremes at a temperature of 38°C. 20 Hz m 20000 Hz m
Consider the sound created by resonating the tube shown below. The air temperature is TC = 30.00°C . What are the wavelength, wave speed, and frequency of the sound produced?

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