Sounds are produced when vibrating objects create pressure waves in some medium such as air. When these variations in pressure reach the human eardrum, it causes the eardrum to vibrate in a similar manner and the ear detects sound. The intensity of sound is measured as power per unit area. The threshold for hearing (minimum sound detectable by a young, healthy ear) is defined to be I 0 = 10 − 12 W / m 2 (watts per square meter). The sound level L , or “loudnessâ€� of sound, is measured in decibels (dB) as L = 10 log I I 0 , where I is the intensity of the given sound. Use this formula for Exercises 95-96. a. Find the sound level of a jet plane taking off if its intensity is 10 15 times the intensity of I 0 . b. Find the sound level of the noise from city traffic if its intensity is 10 9 times I 0 . c. How many times more intense is the sound of a jet plane taking off than noise from city traffic?
Sounds are produced when vibrating objects create pressure waves in some medium such as air. When these variations in pressure reach the human eardrum, it causes the eardrum to vibrate in a similar manner and the ear detects sound. The intensity of sound is measured as power per unit area. The threshold for hearing (minimum sound detectable by a young, healthy ear) is defined to be I 0 = 10 − 12 W / m 2 (watts per square meter). The sound level L , or “loudnessâ€� of sound, is measured in decibels (dB) as L = 10 log I I 0 , where I is the intensity of the given sound. Use this formula for Exercises 95-96. a. Find the sound level of a jet plane taking off if its intensity is 10 15 times the intensity of I 0 . b. Find the sound level of the noise from city traffic if its intensity is 10 9 times I 0 . c. How many times more intense is the sound of a jet plane taking off than noise from city traffic?
Sounds are produced when vibrating objects create pressure waves in some medium such as air. When these variations in pressure reach the human eardrum, it causes the eardrum to vibrate in a similar manner and the ear detects sound. The intensity of sound is measured as power per unit area. The threshold for hearing (minimum sound detectable by a young, healthy ear) is defined to be
I
0
=
10
−
12
W
/
m
2
(watts per square meter). The sound level
L
,
or “loudness� of sound, is measured in decibels (dB) as
L
=
10
log
I
I
0
,
where
I
is the intensity of the given sound. Use this formula for Exercises 95-96.
a. Find the sound level of a jet plane taking off if its intensity is
10
15
times the intensity of
I
0
.
b. Find the sound level of the noise from city traffic if its intensity is
10
9
times
I
0
.
c. How many times more intense is the sound of a jet plane taking off than noise from city traffic?
2. Consider the following:
Prove that x, x2, and 1/x are the solutions to the homogeneous equation
corresponding to x³y"" + x²y" + 2xy' + 2y = 2x4.
b. use variation of parameters to find a particular solution and complete the general
solution to the differential equation. I am interested in process. You may use a
computer for integration, finding determinants and doing Kramer's.
3. A spring is stretched 6 in. by a mass that weighs 8 lb. The mass is attached to a dashpot
mechanism that has a damping constant of 0.25 lb-sec./ft. and is acted on by an external
force of 4 cos 2t lb.
a. Set-up the differential equation and initial value problem for the system.
b. Write the function in phase-amplitude form.
C.
Determine the transient solution to the system. Show your work.
d. Determine the steady state of this system. Show your work.
e.
Is the system underdamped, overdamped or critically damped? Explain what this
means for the system.
4. Suppose that you have a circuit with a resistance of 20, inductance of 14 H and a
capacitance of 11 F. An EMF with equation of E(t) = 6 cos 4t supplies a continuous charge
60
to the circuit. Suppose that the q(0)= 8 V and the q'(0)=7. Use this information to answer the
following questions
a. Find the function that models the charge of this circuit.
b. Is the circuit underdamped, overdamped or critically damped?
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