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Write a two page paper, double-spaced and in your own words, describing why (or how) an FFT (Fast Fourier Transform) was used to "decode" the DTMF frequency code (pattern) used in telephones in the lab activity (performed by the class when you were absent, you can read about this in the lab manual). Please describe the main feature(s) of an FFT and what the DTMF is as a part of this. Be sure to include the following key words in your paper: frequency, frequency spectrum, harmonics, beats (of sound waves), beat frequency. Please be sure to cite your references, such as books you use, web addresses for the pages you used.
A 3-m boom is acted upon by the 4-kN force shown. Determine the tension in each cable and the reaction at the ball-and-socket joint at A.
A hot dog cooker heats hot dogs by connecting them to 120 V household electricity. A typical hot dog has a mass of 50g and a resistance of 130ohm . How long will it take for the cooker to raise the temperature of the hot dog from 20c to 80c ? The ..
A length of wire has a total resistance of 120 ?. If cut up into N identical pieces, How many pieces did the original wire get cut up into
A concrete highway curve of radius 80.0 meter is banked at a 13.0 degree angle. Determine what is the maximum speed with which a 1600 kilogram rubber-tired car can take this curve without sliding
The stagnation temperature at the probe head is 500 K. The static pressure upstream of the shock is measured with a wall tap to be 100 kPa(abs). From these data, estimate the Mach number and velocity of the flow.
Starting from rest, two skaters "push off" against each other on smooth level ice, where friction is negligible. find the recoil velocity of the man relative to the ice
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 9.6 m and, in starting, rotates according to ? = 0.34t^2, find the magnitudes of the astronaut's angular velocity
A potter's wheel moves from rest to an angular speed of .20 rev/s. Find its angular acceleration in radians per second per second.
a pendulum is made with a 4 kg mass suspended at the end of a 75 cm thin rod. the pendulum is started at an angle 20
A person having a mass of 59.1 kg stands before a flight of 30 stairs each of which is 25 cm high. How much work did he do in overcoming gravity
A metallic wire has a diameter of 4.12 mm. When the current in the wire is 8.00 A, the drift velocity is 5.40 x 10^-5 m/s. What is the density of free electrons in the metal
Two boats are heading away from shore. Boat 1 heads due north at a speed of 3.2 m/srelative to the shore. Relative to boat 1, boat 2 is moving 40°north of east at a speed of 1.5 m/s.
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