Describe three general types of noise that have a different dependence on frequency. Give an example of the source of each kind of noise.
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Describe three general types of noise that have a different
dependence on frequency. Give an example of the source of each
kind of noise.
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- 10. The figure shows two loudspeakers (A) and (B), and a point (C) where a listener is positioned. The speakers vibrate out of phase and are playing a 63.0 Hz tone. The speed of sound is 342 m/s. The listener at point (C) hears the third destructive interference (not counting the point at infinity) at a distance 4.00 m as measured from speaker (A). What is the separation (d) between the two speakers? dbg70 dbg70 dbg70 dbg70 dbg7 A d dbg70 dbg dbg70 dbg70 dbg70 dbg70 bg70 dbg70Current Attempt in Progress An ambulance with a siren emitting a whine at 1740 Hz overtakes and passes a cyclist pedaling a bike at 2.53 m/s. After being passed, the cyclist hears a frequency of 1730 Hz. How fast is the ambulance moving? (Take the speed of sound in air to be 343 m/s.) Number Units eTextbook and MediaA spaceship moving at constant speed u relative to us broadcasts a radio signal at constant frequency f0. As the spaceship approaches us, we receive a higher frequency f; after it has passed, we receive a lower frequency. (a) As the spaceship passes by, so it is instantaneously moving neither toward nor away from us, show that the frequency we receive is not f0, and derive an expression for the frequency we do receive. Is the frequency we receive higher or lower than f0? (Hint: In this case, successive wave crests move the same distance to the observer and so they have the same transit time. Thus f equals 1/T. Use the time dilation formula to relate the periods in the stationary and moving frames.) (b) A spaceship emits electromagnetic waves of frequency f0 = 345 MHz as measured in a frame moving with the ship. The spaceship is moving at a constant speed 0.758c relative to us. What frequency f do we receive when the spaceship is approaching us? When it is moving away? In each case what…
- = If you are given two sound intensities, 65 db and 68 db, what will be the sound intensity level using rough calculations ? 10. = Using the same intensities, what will be the sound intensity level using the logarithmic calculations ? 9.A certain accelerometer consists essentially of a box containing a mass-spring system with a known natural frequency of 2200 Hz. The box is rigidly attached to a surface that is moving according to the equation y= δm sin wf t If the amplitude zm of the motion of the mass relative to the box times a scale factor wn2 is used as a measure of the maximum acceleration am = δmwf2 of the vibrating surface, determine the percent error when the frequency of the vibration is 600 Hz.For the beam deflection / beam bending experiment 1a- Briefly state the engineering research problem being addressed. 1b-Briefly explain how the experiment addresses the research problem. In a short parag 1c-State and explain the equations used and the key principles behind them in a short paragraph
- 4. When the total kinetic energy of a system is the same as before and after the collision of two bodies, what is it called? 6. A. Static collision 5. B. Elastic collision What is known as the periodic oscillations either A. Transverse harmonic motion B. Resonance What action does an impulse cause to an object's momentum? A. To change B. To decrease C. To increase C. Inelastic collision D. Plastic collision up or down or back and forth motion in a straight line? C. Rotational harmonic motion D. Translational harmonic motion D. To remain constant or conservedA stationary probe is placed in a fluid flow and measures pressure and temperature as functions of time at one location in the flow. Is this a Lagrangian or an Eulerian measurement? Explain.A bat is flitting about in a cave, navigating via ultrasonic bleeps. Assume that the sound emission frequency of the bat is 37.1 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.030 times the speed of sound in air. What frequency does the bat hear reflected off the wall? Number i Units
- 10 pts Question 4 What is the electric held strength in units of N/C if the flux through a 2.0m by 1.0m rectangular surface is 817 Nm2/C, if the electric field is uniform, and if the plane of the surface is at an angle of T/3 radians with respect to the direction of the field? No decimal is required and maximum of 5% of error is accepted in your answer.An air-conditioning chiller unit weighing 2,000 lb is to be supported by four air springs. Determine the stiffness of the air springs needed such that the natural frequency of vibration of the unit has an average of 7.5 rad/s 15.21 lb/in 291.1 lb/in 121.0 lb/in 72.78 lb/inIs the following statement true? For the false statement, explain why you think they are false:Feedback control theoretically can provide perfect control(i.e., no deviations from set point) if the process model used todesign the control system is perfect.