PHYS 153
Homework 9B
Problem 1
A jet plane at takeoff can produce sound of intensity 10
.
0 W
/
m
2
at 30
.
0 m away. But you
prefer the tranquil sound of normal conversation, which is 1
.
0
μ
W
/
m
2
. Assume that the
plane behaves like a point source of sound.
(a)
What is the closest distance you should live
from the airport runway to preserve your peace of mind?
(b)
What intensity from the jet
does your friend experience if she lives twice as far from the runway as you do?
(c)
What
power of sound does the jet produce at takeoff?
Problem 2
a transverse wave on a rope is given by
y
(
x, t
) = (0
.
750 cm) cos
π
(
0
.
400 cm

1
)
x
+
(
250 s

1
)
t
(a)
Find the amplitude, period, frequency, wavelength, and speed of propagation.
(b)
Sketch the shape of the rope at these values of
t
: 0
,
0
.
0005 s
,
0
.
0010 s.
(c)
Is the wave trav
eling in the +
x
 or

x
direction?
(d)
The mass per unit length of the rope is 0
This is the end of the preview.
Sign up
to
access the rest of the document.
 Winter '08
 MEASDAY
 Work, Velocity, Wavelength, maximum transverse acceleration, maximum transverse velocity

Click to edit the document details