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A room has two opposing walls which are tiled. The remainingwalls, floor, and ceiling are lined with sound-absorbent material. The lowest frequency for which the room is acoustically resonant is50Hz.
a) A complex noise occurs in the room which excites only thelowest two modes, in such a way that each mode has its max.amplitude at t = 0. Sketch the appearance, for each mode seperatly,of the displacement versus x at t = 0, t = 1/200 sec, and t = 1/100sec.
b) It is observed that the max. displacement of dust particlesin the air(which does not necessarily occur at the same time ateach position!) at various points between walls is asfollows: x L/4 L/2 3L/4 ? max +10? +10? -10? What are the amplitudes of each the two seperate modes?
You have a string with a mass of 0.0141 kg. You stretch the string with a force of 9.09 N, giving it a length of 1.81 m. What is the wavelength of the standing wave
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A rigid tank contains 1.50 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 27.4 atm to 4.30 atm
Suppose two vectors each have length 3.0 units. if the two vectors are perpendicular to each other, what is the resultant vector length
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
An astronaut travels at a speed of 0.93c from the Earth to a distant star that is 4.5e+17 m away. how old is she when she arrives at the star
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A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. how fast will the disk be turning
An electric vehicle starts from rest and accelerates at a rate of 2 m/s2 in a straight line until it reaches a speed of 25.00 m/s. The vehicle then slows at a constant rate of 1.1 m/s2 until it stops. (1) How much time elapses from start to stop? ..
Light of wavelength 624 nm is incident perpendicularly on a soap film suspended in air. Assume the soap film has n = 1.33. What are the smallest two thicknesses of the film for which reflections from the film undergo fully constructive interference?
The most abundant isotope of lithium, Li-7, contains three protons and four neutrons and has a mass of 7.01600 u. What is the mass defect for this nucleus in atomic mass units
A capacitance C and an inductance L are operated at the same angular frequency. A) At what angular frequency will they have the same reactance? Express your answer in terms of the variables C and L. B) If L = 5.30mH and C = 3.40\mu F , what is the nu..
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