lim (kl9356) – Homework 20 – Weathers – (17104)
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001
10.0 points
It is found that a 6
.
1 m segment of a long
string contains 3 complete wavelengths and
has a mass of 190 g. At one point it is vibrat
ing sinusoidally with a frequency of 55 Hz and
a peak to valley displacement of 0
.
8 m.
What power is being transmitted along the
string? Answer in units of W.
002
(part 1 of 2) 10.0 points
A point source emits sound waves with an
average power output of 1
.
24 W.
Find the intensity 3
.
15 m from the source.
Answer in units of W
/
m
2
.
003
(part 2 of 2) 10.0 points
Find the distance at which the sound reduces
to a level of 64 dB. Answer in units of m.
004
(part 1 of 2) 10.0 points
A skyrocket explodes 121 m above the ground.
Three observers are spaced 77 m apart, with
observer A directly under the point of the
explosion.
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 Fall '08
 Weathers
 Magnetism, Work, lim, circular wavefront

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