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1) A source emits sound waves isotropically. The intensity of the waves at a distance of 2.50 m from the source is 1.91×10-4 W/m2. What is the power of the sound at the source?
2) A certain sound source is increased in sound level by 30.0 dB. By what multiple is its intensity increased?
3) A point source emits 30.0 W of sound isotropically. A small microphone intercepts the sound at a distance of 200 m from the source. What is the sound level at the microphone?
4) If the microphone in problem 3 has an area of 0.750 cm2. What is the power intercepted by the microphone?
What is the velocity of each ball. while both pipes vibrate at their fundamental frequencies, a beat frequency of 15 Hz is heard. How many centimeters were cut off the end of the second pipe? The speed of sound is 343 m/s.
Two ships are moving along a line due east (see figure below). The trailing vessel has a speed relative to a land-based observation point of v1 = 59.5 km/h, What frequency is monitored by the leading ship
Find out the magnitude of the amount by which the potential difference across the plates changes.
Consider the equation for heat transfer through a wall. Based on this, describe two simple ways you could modify your home to decrease the rate at which heat is lost through your walls.
While a person is walking, his arms swing through approximately a 45.0 degree angle in 0.420s, What is the acceleration of a 0.900 gram drop of blood in the fingertips at the bottom of the swing
A light platform is suspended from the ceiling by a spring. A student with a mass of 74 kg climbs onto the platform. At what time does the maximum speed occur
You throw a 13 g rock and it leaves your hand at a speed of 17 m/s. What is the de Broglie wavelength of this rock
The coefficient of performance of a refrigerator is defined as the ratio of heat extracted, At what rate will this refrigerator deliver heat to the room in which it is operating when it is running
A superhero flies 272m from the top of a tall building at an angle of 32 below the horizontal. What is the vertical component of the superhero's displacement.
The beam emerging from a ruby laser (wavelength 694.3 nm) passes through a circular aperture 4.7 mm in diameter. If the spread of the beam is limited only by diffraction, what is the angular speed of the beam
A charge of 3.0 uC(micro C) and a second charge are initially far apart. find the magnitude of the unknown charge
The tropical year, the time from vernal equinox to the next vernal equinox, Find the number of seconds in one half of a tropical year
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