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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?
An plane and pilot have a total mass of 168 kg. While executing a banked curve of radius 20 m at a speed of 12 m/s
A ball is thrown upward at 20 m/s from the top of a building, which is 100 meter high. Another ball is thrown downward from the top of the building at 15 m/s. What is their final speed when they hit the ground
A rocket of total mass 3180 kg is traveling in outer space with a velocity of 115 m/s toward the Sun. how much mass must be expelled
A generator rotates at 87Hz in a magnetic field of 9.0×10?2T . It has 600 turns and produces an rms voltage of 180V, find the area of each turn of the coil
The acceleration of gravity is 10 m/s2. What is the acceleration of a 39 kg pail of cement that is pulled upward (not sideways) with a force of 421 N? Answer in units of m/s2.
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Electromagnetic waves (light) can form standing waves. In a certain standing wave pattern formed by microwaves, What is the microwave frequency
A spinning flywheel has rotational inertia I = 403.9 kg · m2. What is the frictional torque acting
In order to decrease the intensity of a beam of unpolarized light to 10% of its original intensity using two polarizers, find the angle between the transmission axes of the two polarizers
As the refrigerant passes through the compressor, heat transfer to the surrounding occurs at a rate of 0.32 kJ/s. Determine at steady state the power input to the compressor, in kW.
I have a rectangular slab of aluminum that is in contact with a rectangular slab of copper and both slabs are 5.00 cm x 15.0 cm in area. how much energy would flow from one face to the other
A 6.00uC charge is placed at the origin and a second charge is placed on the x-axis at x=0.300m. what is the force on the charge at the origin
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