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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.6 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.60 10-11 W/m2. What is the intensity delivered to the eardrum?
W/m2
A car of mass = 1300 travelling at 56.0 enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between the road and car's tires. What is the radius of the turn if = 20.0 (assuming the car continues in uniform ..
A thin ring of radius R carries a charge 3Qdistributed uniformly over three-fourths of its circumference, and -Q over the rest
If astronauts could travel at v = 0.910c, we on Earth would say it takes (4.20 / 0.910) = 4.62 years to reach Alpha Centauri, 4.20 light-years away. How much time passes on the astronauts' clocks
A layer of oil (n = 1.45) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid. What is the index of refraction of the unknown liquid
What is the maximum angle of incidence for a light ray within the water to strike the glass wall and still emerge to the outside air
Cations are removed from the exchange complex of a 1 kg oven-dry soil sample by ammonium (NH4+) substitution. What is the cation exchange capacity of the soil
A 460-Hz tuning fork causes resonance in the tube depicted in the figure below when the length L of the air column above the water is 18.3 and 55.8 cm, Find the speed of sound in air
The magnetic flux through one turn of a 52-turn coil of wire is reduced from 28.1 Wb to 4 Wb in 0.10 s. Find the total resistance of the wire
If one shines a laser with wavelength ? = 650 nm through a single slit of width a = 0.04 mm, How far apart are the minima
Refrigerant r-134a flows through a refrigeration system at a rate of 0.12 kg/s. At the entrance to the adiabatic compressor, find the power required by the compressor
The earth has a radius of approximately 6400 km. how fast would it have to travel
If the range of discharge times that can be handled effectively is from 10.0 μ s to 6.00 ms, illustrate what should be the (a) lower value and (b) higher value of the resistance range of the resistor?
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