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 motorcycle if its intensity is 10 10 times I 0 . b. Find the sound level of a vacuum cleaner if its intensity is 10 7 times I 0 . c. How many times more intense is the sound of a motorcycle than a vacuum cleaner?
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 motorcycle if its intensity is 10 10 times I 0 . b. Find the sound level of a vacuum cleaner if its intensity is 10 7 times I 0 . c. How many times more intense is the sound of a motorcycle than a vacuum cleaner?
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 motorcycle if its intensity is
10
10
times
I
0
.
b. Find the sound level of a vacuum cleaner if its intensity is
10
7
times
I
0
.
c. How many times more intense is the sound of a motorcycle than a vacuum cleaner?
Only 100% sure experts solve it correct complete solutions ok
rmine the immediate settlement for points A and B shown in
figure below knowing that Aq,-200kN/m², E-20000kN/m², u=0.5, Depth
of foundation (DF-0), thickness of layer below footing (H)=20m.
4m
B
2m
2m
A
2m
+
2m
4m
sy = f(x)
+
+
+
+
+
+
+
+
+
X
3
4
5
7
8
9
The function of shown in the figure is continuous on the closed interval [0, 9] and differentiable on the open
interval (0, 9). Which of the following points satisfies conclusions of both the Intermediate Value Theorem
and the Mean Value Theorem for f on the closed interval [0, 9] ?
(A
A
B
B
C
D
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