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The Human Voice. The human vocal tract is a pipe that extends about 17 cm from the lips to the vocal folds (also called ''vocal cords") near the middle of your throat. The vocal folds behave rather like the reed of a clarinet, and the vocal tract acts like a stopped pipe. Estimate the first three standing-wave frequencies of the vocal tract. Use v = 344 m/s.
A high-voltage transmission line with a resistance of 0.29 /km carries a current of 1030 A. The line is at a potential of 690 kV at the power station and carries the current to a city located 162 km from the station.
You are at a rock concert, and the sound intensity reaches levels as high as 100 dB. Calculate the amplitude of this oscillating force
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 0.0076 m/s2 less than that at sea level. Determine what is the observatory altitude in kilometer
Assuming that the smallest discernable and measurable relief displacement that is possible on a vertical photograph taken at 3000 feet above the ground is 0.5 mm; determine the height of a telephone utility box
A 72kg man climbs a 1192 m high mountain in 1.43 hour and uses 7.6kcal/min. What is the power ouTput in useful work
The earth has a net electric charge that causes a field at points near its surface equal to 150N/C and directed in toward the center of the earth. a) What magnitude and sign of charge would a 60 kg human have to acquire to overcome his or her weig..
At a distance r1 from a point charge, the magnitude of the electric field created with the charge is 337 N/C. At a distance r2 from the charge, the field has a magnitude of 180 N/C. Discover the ratio r2/r1.
You and a friend each drive 67 km to the same destination. You travel at 88.9 km/h and your friend at 98.8 km/h. How long will your friend wait for you at the end of the trip
A steel ball with mass 40.0g is dropped from a height of 2.00monto a horizontal steel slab and it rebounds 1.60m, calculate the impluse delivered to the ball during impact
It takes 2.40 s for a small ball with a mass of 0.120 kg released from rest from a tall building to reach the ground. Calculate the height from which the ball is released
A wheeled cart is shoved up an inclined plane with an unknown initial speed. What was the cart's initial speed
A conducting rod is moving during a magnetic field, as in the drawing. The magnetic field strength is 0.65 T, and the speed of the rod is 4.8 m/s. Abruptly, the field strength decreases to 0.48T. To what value must the speed v of the rod be adjusted ..
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