2) The ability to hear a \"pin drop\" is the sign of sensitive hearing. Suppose

Question

2) The ability to hear a "pin drop" is the sign of sensitive hearing. Suppose a 0.59-g pin is dropped from a height of 24 cm, and that the pin emits sound for 2.5 ms when it lands. Assuming all of the mechanical energy of the pin is converted to sound energy, and that the sound radiates uniformly in all directions, find the maximum distance from which a person can hear the pin drop. (This is the theoretical maximum distance, but atmospheric absorption and other factors will make the actual maximum distance considerably smaller.)

_____m

3) To determine the amount of temporary hearing loss loud music can cause in humans, researchers studied a group of 20 adult females who were exposed to 113-dB music for 60 minutes. Eleven of the 20 subjects showed a 18-dB reduction in hearing sensitivity at 4000 Hz. What is the intensity corresponding to the threshold of hearing for these subjects?

_____W/m2

4) A person with a mass of 78 kg and a volume of 0.083 m3 floats quietly in water.

(a) What is the volume of the person that is above water?
_____m3

(b) If an upward force F is applied to the person by a friend, the volume of the person above water increases by 0.0015 m3. Find the force F.
_____N

5)The patient in the figure below is to receive an intravenous injection of medication. In order to work properly, the pressure of fluid containing the medication must be 109 kPa at the injection point.

(a) If the fluid has a density of 1027 kg/m3, find the height at which the bag of fluid must be suspended above the patient. Assume that the pressure inside the bag is one atmosphere.
_____m

(b) If a less dense fluid is used instead, must the height of suspension be increased or decreased?

1) A bird-watcher is hoping to add a particular song bird to her life list of species. If a person, only 0.70 m from the bird, hears the sound with an intensity of 1.80 10^-6 W/m^2, how far could the bird watcher be from the bird and still hear it? Approximate the bird as a point-source of sound, and assume no reflections or absorption of the bird's sound. Note that the faintest sound that can be heard has an intensity of 10^12 W/m^2. _____km 2) The ability to hear a pin drop is the sign of sensitive hearing. Suppose a 0.59-g pin is dropped from a height of 24 cm, and that the pin emits sound for 2.5 ms when it lands. Assuming all of the mechanical energy of the pin is converted to sound energy, and that the sound radiates uniformly in all directions, find the maximum distance from which a person can hear the pin drop. (This is the theoretical maximum distance, but atmospheric absorption and other factors will make the actual maximum distance considerably smaller.) _____m 3) To determine the amount of temporary hearing loss loud music can cause in humans, researchers studied a group of 20 adult females who were exposed to 113-dB music for 60 minutes. Eleven of the 20 subjects showed a 18-dB reduction in hearing sensitivity at 4000 Hz. What is the intensity corresponding to the threshold of hearing for these subjects? _____W/m^2 4) A person with a mass of 78 kg and a volume of 0.083 m^3 floats quietly in water. (a) What is the volume of the person that is above water? _____m^3 (b) If an upward force F is applied to the person by a friend, the volume of the person above water increases by 0.0015 m^3. Find the force F. _____N 5)The patient in the figure below is to receive an intravenous injection of medication. In order to work properly, the pressure of fluid containing the medication must be 109 kPa at the injection point. (a) If the fluid has a density of 1027 kg/m^3, find the height at which the bag of fluid must be suspended above the patient. Assume that the pressure inside the bag is one atmosphere. _____m (b) If a less dense fluid is used instead, must the height of suspension be increased or decreased?

Explanation / Answer

A)Solution:
r2

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