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A warehouse is 75 ft x 45 ft with a 25-ft ceiling. The walls, floor, and ceiling have absorption coefficients of 0.1, 0.1, and 0.4, respectively, in the 1000-Hz octave bend. An acoustically isotropic pneumatic machine produces a sound pressure level of 96 dB at a distance of 30 ft from the machine. What is the sound pressure level in the 1-kHz band at a position 10 ft from the source?
An electron traveling with a velocity of 6.0 *105 m/s along the direction enters a uniform magnetic field of 0.60 T pointing in the direction. Calculate the magnitude of the force on the electron
A playground carousel is free to rotate about its center on frictionless bearings. Find the resulting angular speed of the carousel and person
A 60.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.717 and 0.307, respectively. What horizontal pushing force is required
Workers have loaded a delivery truck in such a way that its center of gravity is only slightly forward of the rear axle. The mass of the truck and its contents is 6860 kg. Discover the magnitudes of the forces excreted by the ground on the front whee..
A 0.15 kg ball hits a wall with a velocity of (4.00 m/s) + (5.50 m/s) + (5.50 m/s) . It rebounds from the wall with a velocity of (2.00 m/s) + (3.50 m/s) + (-3.20 m/s). What is the change in the ball's momentum?
A laptop communicates with a router wirelessly, by means of radio signals. obtain how many bits are downloaded to the laptop in the time it takes the wireless signal to travel from the router to the laptop
The temperature of 1.3 kg of water is 34° C. To cool the water, ice at 0° C is added to it. The desired final temperature of the water is 11° C. determine how much mass m of ice should be added
A guitar string is supposed to vibrate at 247Hz, but is measured to actually vibrate at 255Hz. By what percentage should the tension in the string be changed to get the frequency to the correct value?
Two blocks with mass m1=2kg and m2=3kg hang on either side of a pulley. Block m is on an incline at 30 degrees, Find the maximum extension of the spring.
A series RCL circuit includes a resistance of 298 ohm, an inductive reactance of 648 ohm, and a capacitive reactance of 415 ohm. The current in the circuit is 0.634 Amps. What is the Voltage of the alternator?
A large wooden turntable in the shape of a flat uniform disk has a radius of 2.00 {\rm m} and a total mass of 120kg. Find the angular speed of the turntable after the parachutist lands
Suppose an RLC circuit must be created by choosing an inductor and capacitor to place in series with a 1200 ohm resistor. To tune in the AM band frequencies, calculate an appropriate value for the inductance and determine the max and min capacitance..
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