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hopkins (tlh982) – HW01 – criss – (4908)
1
This printout should have 19 questions.
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beFore answering.
001
10.0 points
At
t
= 0, a transverse wave pulse in a wire is
described by the Function
y
= 5
e

x
2
/
2
,
where
x
and
t
are given in SI units.
Which Function describes this wave iF it is
traveling in the negative
x
direction with a
speed oF 4
.
5 m
/
s?
1.
y
= 5
e

(
x
2

4
.
5
t
)
/
2
2.
y
= 5
e

x
2
/
2
+ 4
.
5
t
3.
y
= 5
e

(
x

4
.
5
t
)
2
/
2
4.
y
= 5
e

(
x
2
+4
.
5
t
)
/
2
5.
y
= 5
e

x
2
/
2

4
.
5
t
6.
y
= 5
e

(
x
+4
.
5
t
)
2
/
2
7.
y
= 5
e

x
2
/
2
002
10.0 points
A carbon steel piano wire 1 m long with a
crosssectional area oF 2
×
10

6
m
2
and mass
0
.
1 kg is stretched 30 mm.
±or carbon steel, the Young’s modulus is
2
×
10
11
N
/
m
2
.
Determine the speed oF transverse waves on
the string. Answer in units oF m
/
s.
003
(part 1 oF 4) 10.0 points
A traveling wave propagates according to the
expression
y
= (5
.
55 cm) sin[(1
.
98 cm

1
)
x

(2
.
79 s

1
)
t
]
,
where
x
is in centimeters, and
t
is in seconds.
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 Fall '08
 RobertR.Criss
 Physics

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