Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?

5) A disk of mass m = 75.0 g and radius r = 4.20 cm glides across an air table at a speed v = 1.5 m/s. It makes a glancing collision with a hoop of radius R = 5.80 cm and mass M = 130 g (initially at rest) such that their rims just touch. Because their rims are coated with instant-acting glue, the two objects stick together and rotate after the collision. a)  What is the angular momentum of the system relative to the center of mass? b)  What is the angular speed about the center of mass?

according to the barometric measurements, the sound has a decibel level of 180 dB at a distance of 161 km. Assuming the intensity falls off as the inverse of the distance squared, what was the decibel level on the island 4800 km away?

What is the decibel level of a sound that is twice as intense as a 100.0-dB sound? (b) What is the decibel level of a sound that is one-third as intense as a 100.0-dB sound?

Example M 500 High Rings for some time before dying out. A tuning fork with Q = 1000 is struck, producing a sound at 1 m of 60 dB with a frequency of 440 Hz. How loud is the sound after 10 seconds...? Q=1/4 A(t) = Age-t 入

Problem #3: What intensity level dB in does a sound of 3. 04 × 10–4 W/m2 correspond to?

TI The sound intensity level 5.0 m from a large power saw is 100 dB. At what distance will the sound be a more tolerable 80 dB? Express your answer with the appropriate units. R₂ = Submit ΠΑ Templates Value Provide Feedback Request Answer Units ?

The sound pressure level at 250 Hz is 50 dB in one room and in 30 dB in the other. The surface area of the wall between them is 15 m2. The total amount of absorption at 250 Hz in the room with the lower noise level is 20 Sabines. What is the sound reduction index of the separating partition at 250 Hz:a. 20.0 dBb. 17.5 dBc. 18.8 dBd. 44.8 dB

A weather emergency siren is mounted on a tower, 153 m above the ground. On one hand, it would be a good idea to make the siren very loud so that it will warn as many people as possible. On the other hand, safety regulations prohibit the siren from exceeding an intensity level of 101 dB for workers standing on the ground directly below the siren. Assuming that the sound is uniformly emitted, what is the maximum power that the siren can put out? maximium power output: W * TOOLS х10 How far away from the bas and still be able to hear the siren? Neglect any absorption of sound energy by the air; although, in reality, such absorption would be significant at long distances. maximum audible distance: m

A cars bumper is designed to withstand a 4.0km/h (1.1 -m/s) collision with an immovable object without damaging the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force on a bumper that collapses 0.185m while bringing a 875kg car to rest from an initial speed of 0.85m/s in newtons.