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Chapter 17: Q72P (page 510)
A bullet is fired with a speed of . Find the angle made by the shock cone with the line of motion of the bullet.
Angle made by shock cone is
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When you 鈥渃rack鈥� a knuckle, you suddenly widen the knuckle cavity, allowing more volume for the synovial fluid inside it and causing a gas bubble suddenly to appear in the fluid. The sudden production of the bubble, called 鈥渃avitation,鈥� produces a sound pulse, the cracking sound. Assume that the sound is transmitted uniformly in all directions and that it fully passes from the knuckle interior to the outside. If the pulse has a sound level of at your ear, estimate the rate at which energy is produced by the cavitation?
A sinusoidal sound wave moves atthrough air in the positive direction of an xaxis. At one instant during the oscillations, air molecule Ais at its maximum displacement in the negative direction of the axis while air molecule Bis at its equilibrium position. The separation between those molecules is, and the molecules between Aand Bhave intermediate displacements in the negative direction of the axis. (a) What is the frequency of the sound wave?
In a similar arrangement but for a different sinusoidal sound wave, at one instant air molecule Cis at its maximum displacement in the positive direction while molecule Dis at its maximum displacement in the negative direction. The separation between the molecules is again, and the molecules between Cand Dhave intermediate displacements. (b) What is the frequency of the sound wave?
A sound wave in a fluid medium is reflected at a barrier so that a standing wave is formed. The distance between nodes is , and the speed of propagation is. Find the frequency of the sound wave.
A sound source moves along an xaxis, between detectors Aand B. The wavelength of the sound detected at Aisthat of the sound detected at B. What is the ratioof the speed of the source to the speed of sound?
In Fig. 17-45, sound wavesand, both of wavelength, are initially in phase and traveling rightward, as indicated by the two rays. Wave Ais reflected from four surfaces but ends up traveling in its original direction. What multiple of wavelengthis the smallest value of distancein the figure that puts Aand Bexactly out of phase with each other after the reflections?
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