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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 26.2 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.40 10-11 W/m2. What is the intensity delivered to the eardrum?
A converging lens(f1=4 cm) is located 8 cm to the left of a diverging lens (f2= -2 cm). Find the final image formed by the 2 lens system
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 21 to 59 dB. What is the ratio of the final sound intensity to the original sound intensity?
An airplane pilot wishes to fly due west. A wind of 80.0is blowing toward the south. What is the speed of the plane over the ground
a car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is traveling due west at 20 m/s. find the direction of the car's average acceleration
A pot containing1.00 liter of water, initially at 20.08C, is placed on a 1000 W electric heating element. How much heat must be supplied to the water to bring it to a boil
Suppose you want to make a scale model of a hydrogen atom. For the nucleus you choose a small ball bearing with a radius of 1.7 mm, What would be the radius of the model
The "literature" refers to books, journal articles, magazine and newspaper articles, company records and documents, and even personal interviews with knowledgeable industry conflict resolution experts.
Piano tuners tune pianos by listening to the beats between the harmonics of two different strings. When properly tuned, the note A should have a frequency of 440 Hz and the note E should be at 659 Hz.
A quantity of carbon monoxide gas is slowly compressed adiabatically in an insulated container to one-half of its volume. determine the final pressure of the gas
The sun is 1.5 1011 m from the earth. What is the total power radiated by the sun and Over what surface area is solar radiation spread at this distance
What is the final velocity of a hoop that rolls without slipping down a 7.50 m high hill, starting from rest
A 5.0 gram piece of Styrofoam carries a net charge of - 5.0 X 10-6 C and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet?
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