Expectant parents are thrilled to hear their unborn baby’s heartbeat, revealed by an ultrasonic motion detector. Suppose the fetus’s ventricular wall moves in simple harmonic motion with amplitude 1.80 mm and frequency 115 beats per minute. The motion detector in contact with the mother’s abdomen produces sound at precisely 2 MHz, which travels through tissue at 1.50 km/s. (a) Find the maximum linear speed of the heart wall. (b) Find the maximum frequency at which sound arrives at the wall of the baby’s heart. (c) Find the maximum frequency at which reflected sound is received by the motion detector. (By electronically “listening” for echoes at a frequency different from the broadcast frequency, the motion detector can produce beeps of audible sound in synchrony with the fetal heartbeat.)

One end of a horizontal string is attached to a small- amplitude mechanical 60.0-Hz oscillator. The string's mass per unit length is 3.2 x10-4kg/m. The string passes over a pulley, a distance l = 1.50 m away, and weights are hung from this end. Assume the string at the oscillator is a node, which is nearly true. (Figure 1) Figure Oscillator -1.50 m 1 of 1 m What mass m must be hung from this end of the string to produce one loop of a standing wave? Express your answer to two significant figures and include the appropriate units. m1 = Submit Part B m2 = μA Value O Request Answer What mass m must be hung from this end of the string to produce two loops of a standing wave? Express your answer to two significant figures and include the appropriate units. μA Units Value ? Units ?

The windpipe of one typical whooping crane is 5.5 feet long. What is the fundamental resonant frequency of the bird's trachea, modeled as a narrow pipe closed at one end? (Assume a temperature of 34°C.)

Let (10000 Hz) be the frequency of the sound emitted by one of the audio CD equipment, where the drum rotates at a rate of (33.33 rev/ min) and that the distance between the edge of the drum and its center is (6 inch), the periodic time of the drum is: Not what was mentioned 1.08 s 1.8 s 18 s

A string with a length of 1.65 m is fixed at both ends. It is then allowed to oscillate transversely such that there are 1 nodes between the ends, with an amplitude of 16.6 cm. What is the maximum transverse displacement of the string 0.967 m from one end? Please give answer in units of cm.

The air pressure variations in a sound wave cause the eardrum to vibrate. A) Find the maximum velocity of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 Hz. m/s B) Find the maximum acceleration of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 Hz.in m/s^2 C) Find the maximum velocity of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 kHz. in m/s  D) Find the maximum acceleration of the eardrum for vibrations of amplitude 5.15 × 10−8 m at a frequency of 20.0 kHz. m/s^2

How long is this column of air if v = 354 m/s?

(a) Expectant parents are thrilled to hear their unborn baby's heartbeat, revealed by an ultrasonic motion detector. Suppose the fetus's ventricular wall moves in simple harmonic motion with an amplitude of 1.70mm and a frequency of 130. per minute. Calculate the maximum linear speed of the heart wall. Suppose the motion detector in contact with the mother's abdomen produces sound at 1910000Hz, which travels through tissue at 1.50km/s. (b) Calculate the maximum frequency at which the sound would be perceived at the wall of the baby's heart. (c) Calculate the maximum frequency at which reflected sound is received by the motion detector. (By electronically "listening" for echoes at a frequency different from the broadcast frequency, the motion detector can produce beeps of audible sound in synchronization with the fetal heartbeat.)

The equation of motion of a particle in simple harmonic motion is given by: x(t) = 0.3cos(wt), where x is in meters and t is in seconds. At x = 0, the particle's velocity is v = -1.256 m/s. The period of oscillation, T, equals: 1 sec 0.5 sec O 0.25 seC 1.5 sec O 3 sec The wavefunction of a mechanical wave on a string is described by y(xt) – 0.012cos(TtX-100tt+2rt/3), where x and y are in meters and t is in seconds. The transverse velocity of an element on the string at the left end (x = 0), at time t= 0 is:

A sound wave of wavelength 40 cm travels in air. If the difference between the maximum and minimum pressures at a given point is 1'0 x 10 'N/m, find the amplitude of vibration of the particles of the medium. The bulk modulus of air is 1'4 x 10 N/m.